Sir, you are too kind at matyaga kang magturo at mag explain. Kaya naman binigyan ka ni LORD nang angking talino para sa ganuon ay mai share mo sa mga tulad naming gustong matuto sa pag design.Naway Bless pa kayo ni LORD. Sana gumawa ka nang design of Steel Connection sa rafter using bolted.
Thank you for this video Sir. Maganda po ang explanation and pinapakita talaga kung saang bahagi ng NSCP 2015 hinugot ang mga ginamit na formulas and concepts. Maganda ito irecommend sa mga students, sa mga nag rereview for licensure exam, and sa mga engr. na gustong ma refresh ang design. Also, thank you for being responsive sa mga questions sa comment section. More power po!
We need more kinds of this tutorials!! Especially these times!! More power to you Sir!! 2nd replay ko na. :D Design of columns, beams and slab naman sana next :)
salamat sa appreciation mam. kindly share my channel to your friends and let them subscribe and watch my video lectures. more to come pa po. main goal ko makumpleto ko structural engineering courses then saka ako jajump sa softwares application and also to allied engineering courses.
Thank you sa Lecture Sir. Matanong ko lang about sa Stability Check kung ano ang mga Load Combinations na gagamitin? Namomoblema kasi ako sa uplift kapag ginamit ko yung Load Comb na 0.6D + E/1.4 (NSCP 2015 Eqn 203-15).
kindlyr efer to the discussion the difference between qnet and qa :) as a short answer allowable soil pressure is the maximum limit condition to carry load while net stress is the discrepancy of soil pressure considering the constraints of soil, concrete structure under foundation and pore water pressure.
Very informative video, by the way sir question lang. In what case nagkakaroon ng top reinforcement ang isolated footing? My other way of calculation ba na magdagdag ng top reinforcement to reduce yung size ng footing?
yes boss. square footing pa lang. follow ko na din ang wall footing, rectangular footing and combined for shallow type. also magdiscuss din ako ng may moment na load sa column para maanalyze ang transfer of moment from column to footing via bearing area and shear area
Maraming salamat po sir tolentino. Its been an honor to me to be praised by the origibal and one true only master of caltech. Pillar as we call it. Salamat po sir dahil moat of my knowledge and confidence is nanggaling po sa inyo bilang studyante nyo po before and bilang mentor and coach during quizbee that lead us victories in those respective quiz competitions :)
Thank you po sir sa lecture, napakalinaw at detailed po. May tanong lang po ako sir, don po sa pagkuha nang As, ginamit ko po kasi sa formula ng Mu ay Mu=∅bd²Rn, then same naman po tayo nakuha sa value ng As na 5543.2797mm², ang tanong ko po ay kapag kinompare po yung rho minimum (p=1.4/bd) sa nasolve ko po na rho, mas malaki po value nung sa rho minimum kaya yon po gagamitin diba po? tas pag ginamit po yun magiiba po non ang As, As=8200mm² na po. Sana po malinawan po ako, hindi kopo kasi alam kung tama po ba idea ko. Thanks po sir!
Sir, pano po pag may transverse/horizontal loading, di ba po magiging moment sya? Pero ano po yung perpendicular distance po? To top of footing po ba or bottom? Salamat in advance po.
sir may question ako sa pagkuha sa number of bars. what if sir we get the value of Rn then get the value of p(roh) and compare it to pmin(rohmin) then we can obtain the value of As then the number of bars? would it be possible? thank you sir!! and Godbless!!
ah. an old school style of calculations. usually if yopu will use rn (flexure coefficient) usually may table na tinitingnan yan. yan ang gamit ng Rn is may table na sinisipat then poof... may deisgn values agad :) pero if calculation piece lang din naman ang pagbabatayan then Rn is just derived from the original formulation so much better if iexercise yung direct calcs para nakikita yung mga changes sa sense ng values. note that the rho (reinf ratio) is intended for a least value of constraint to check whether possible flexural failure may happen but superceeded by the moment capacity of the section to resist load :) note that moment is a function of curvature or what we call ductility condition or simply rho :) whatever method you are going to use make sure you know its limitations and proper uses so that at the end of the calculations all values are usable :) cheers.
Sir , Galing po ng pag explain at detailed talaga yung mga facts nyo, tanong ko lang sir, ano po ang pinag kaiba ng NSCP 2010 sa NSCP 2015 ? mostly yung ibang vid 2010 nscp sa kanila
It is written in the front part of nscp 2015 regarding the changes before jumping on chapter 1. There is a list of changes there fro 2010 to 2015. See for your self and have some fun reading it :)
sir sa 1:25:43 kung sakali pong mas mataas yung ld ko sa ldmax, ang advisable lang po talagang i-adjust ay yung base at cc? Hanggang ilan po yung pwede kong iadjust sa cc po? Tapos sir pano po kung mas mataas pa din yung ld ko kahit na nag-adjust na po ako? Salamat po sir.
Hi as mentioned it means yung dimension ng Footing mo is kulang assuming 75mm na ginamit mong concrete cover due to exposure to earth. So puede pa magbago yung footing dimension since lalaki siya dahil kulang/inadequate yung development length nya as set forth by code provision then revisit the checking of OWS, TWS, flexure, and Bearing connection of Column and Footing :)
yes both directions need icheck hanggat maaari pero may mga conditions reg analysis to minimize the checks but ordinarily dapat both sides sana specially pag may moments sa column on both directions
Hi. It was already discussed in the video lecture roght after this topic. Design of rectangular footing :) kindly find it on my playlists by visiting my yt channel. "Patience and diligence is a virtue" :)
Sir question lang regarding sa computation ng effective depth. as you have said in the video, ang effective depth is in between main and shrinkage bar. so d = T - cc - db. pag naman sa slab po sir. kasi ang ginagwa ko sa slab is D1= T - Cc - db/2 (bottom bar first lay) D2 = T - Cc - db - db/2 (bottom bar 2nd lay) since as you have mentioned ang footing ay slab din. therefore ganun din dapat ginagawa ko sa slab? then mo mali po yung ginagawa ko sa slab?
hehehe as explained in the video lecture, slab treatment of effective d is different in footing although a footing is just like a flat slab :) cheers. note that slab is continuously connected in a frame that is why the slab rebars act independently and effective depth d is found on the last layer nearest to the tension fiber of concrete and usually they are alternate in position since compression and tensions changes in position (positive and negative moment relations). Meanwhile, Footing has only one type of concavity if isolated type. so it was found out that the layer in between the main and temp is the location of the effective depth (does not change position with regards to compression and tension, see my discussion how footing bends when subjected for flexure).
i think this is the right for you to study deeply on different types of slab, slab as a shell element and slab as a plate element, slab as a membrane element, and slab as a layered element :)
@@nioroskyengineeringonline8968 well explained sir. going back to college, i remember that slab has tension and compression. for left and right support, the tension is within the top of slab since negative moment occur on the support, while on midspan the tension fiber is at the bottom of slab since positive moment occur at the midspan. my next question is, how do i calculate the compression bars for the slab? is it necessary to use temp shrinkage or just the Asmin?
@@iangalicia8264 check if it passes the min condition based onthe grade of rebar. Not that in slab as a diaphragm suffers two types of bending, while in the foundation suffers only type of bending as discussed in one of my video lecture here in isolated footing. It will be different when mat ot combined footing. Soon to upload my video lecture reg on that.
hi. i already explained in the concept that the calculation of the effective depth of the steel bars found on footing is the space between top and bottom bars while on beam and column and as well as slab is at the rebar center. This is due to the action of the flexure found on the footing and found at that the perforation happening is in between the layer of the two directions of the bars ssince the spaace is limited and also the action seems orthodirectional. As a proof the cracks found on foundation failure assuming flecure alone is always found on that particular layer as proven by laboratorical experimentation. this is also stresses by one of the committe member of ACI which is committe number 318 in the personality of Macgregor, one of the authors of the RCD books that is good to read with. Notice that most of the reference books alwaays refer the concept to Macgregor since he was an expert of this design principle :) cheers
also this one. happy viewing :) ruclips.net/video/J6yGNI7qRyk/видео.html you can validate my discussion by reading reference books authored by Macgregor and the likes, not review books since it has too many errors, sad to say.
good day. as mentioned in the video lecture, the discussion for Bo done here are only for footings which is centered and whose critical area is not exceeding the footing bearing area. Otherwise there should be a consideration of shear center based on the location of the column at the bearing area of footing to be discussed in my future video lecture. cheers
Thanks napanuod ko una hanggang dulo. Dun po ba sa reduction factored phi(φ) is equivalent to 0.75. (32:33) yan po ba ang updated na nscp? 0.85 pa po kase gamit namin sa college. Thanks in advance for the answer.
Please see the separate discussion on that matter. It can be found on my RCD playlist on reduction factoe. I think 0.85 can be fpund on nscp 2000 which is already obsolete :) nscp 2015 na po gamit natin. Cheers.
@@butikegtv3590 none. Reason is the as most likely will fall under lower than Asmin or maybe higher than Asmin but wont exhibit higher than potential Asmax since the footing is cobsidered as a slab element where sectional is small as well as effective depth. We learn before taht rho is As/bd so if the d is small then As is large. So in terms of Asmax since d is very small then rho is very large. You will notice it anyway. That is why code does bot provide Asmax condition for footing.
Hi most likely the values for the values for DL and LL will be calculated from the force members transferred from the column to the footing and tie beams. There will be a separate video lecture for that :)
@@leobanco597 yes you can have the valuea from any design software that is capable to calculate forces like staad, etabs, sap, etc. Or even an excel design program can do also the same job by programming it appropriately. The most precised calculation is through finite element analysis since it uses boundary conditions.
@@leobanco597 yes you can have the valuea from any design software that is capable to calculate forces like staad, etabs, sap, etc. Or even an excel design program can do also the same job by programming it appropriately. The most precised calculation is through finite element analysis since it uses boundary conditions.
Hi isa yan sa mga next topic. As discussed centroidal pa lang yung loadings and wala pang moment as a load. There will be a separate discussion on that since it will apply concepts on strength of material like shear centre.
hi. maraming constraints yung pagselect ng thickness and depth. as for my actual design projects, nagrerely muna ako sa soil bore hole log reports para madetermine ko yung desirable depth and thickness ng footing. if walang soil investigation report or just purely theoretical yung gagawin mong calculations as per classroom puposes lang, You can Try at D = B as mentioned in Terzaghi's condition where D = depth of footing, B = least dimension ng rectangular or diameter ng circular footing. Using Soil bearing checks then makakakuha ka ng D and B, then for the thickness ng footing you can use the One Way Shear or Two Way Shear.
Other way naman is gumagamit ng presumptions ng multiple of 55 sa depth of footing if backho ang gagamiting panghukay since ang nababawas sa isang kahig ng backhoe is most near to 75mm (3inches). then inaassume na wala munang lupa sa taas ng footing, nagkakaoverestimation ng kaunti.
In practice, nagseset kami agad between 1.0 to 2.0 meters since usually duun ang desirable depth basta hindi dangerous sa settlement or other factors that might give failures sa foundation especially liquefaction effect (uneven settlement). Then chinecheck namin using allowable soil bearing pressure and cocompute na kami ng thicknes required using one way or two way.
@@angelicapenaflorida1903 salamat. you can also add me up sa facebook account ko. just search my name and i also entertain question through facebook messenger. Nioro Guevarra Furiscal. ALso please subscribe to my YT Channel :) Thanks and regards
@@nioroskyengineeringonline8968 sir, for the fence lang poh. dbah load itself lang ang meron? need p din bang malaman ang SBC nya kahit for fence lang ??
@@zandralyninfante7028 all structural members should conform to the code. Please refer to our design code otherwise you dont want that fence to overturn and kill people whose walking beside it. Safety first before everything else.
Hi engr, I have a query with regards on finding the qna. Hindi ba dapat qnu/FS siya instead of qu? kasi if iplug in yung values from the solution instead of dividing the summation of weight values ay namultiply siya by the FS.
Hi. If you are asking for dimension assessment its qult first since how can you get qnult if you dont have the size of footing to deduct as an effect of stress to be transferred on the footing itself :) also as set forth in section 413.3.1.1. Cheers
Also by logic, is it right qna is greater than qult whereas qult is the factored stress? Note that qult is the magnified value of stress and qna is the net condition lower than qult due to deductions of stresses transfered from generated stresses above.
@@nioroskyengineeringonline8968 I'm just wondering that the paired equations for q_ult would be q_all and if net would be qn_ult and qn_all. Then basing with NSCP it is not how it should be paired. Anyway, just confirming things. Thanks
@@engineersspace2024 @norielepaulcruz3242 q ult is the reference since we are approximating bearing resistance based from forces that understand service state conditions. Note that it is set as a min condition for approximating sizes of footing then note for final checking the qna was taken to assess proper stress where stress of soil was deducted to q ult since size is determined as shown in 1:29:33 for final checking.
Sorry boss, pero ang hirap sundan. I think mahina talaga ako kasi paulitulit ka na magsalita di ko pa din magets sa dami ng redundancy mong pinagsasabi.
Sir, you are too kind at matyaga kang magturo at mag explain. Kaya naman binigyan ka ni LORD nang angking talino para sa ganuon ay mai share mo sa mga tulad naming gustong matuto sa pag design.Naway Bless pa kayo ni LORD. Sana gumawa ka nang design of Steel Connection sa rafter using bolted.
salamat bossing
Ang way ng pagturo ni Engr. ay talagang detalyado... Eto palang ang napanood kong video niya pero ang galing. keep it up sir!
Excellent Engr. Niorosky, well explained and very helpful especially those who are not update in the NSCP 2015 code. Thanks Sir!
Godbless sayo sir daming mung natulungan na student at engineers
Hope di ka mag sawa sa pag share ng mga video tutorials
Thank you for this video Sir. Maganda po ang explanation and pinapakita talaga kung saang bahagi ng NSCP 2015 hinugot ang mga ginamit na formulas and concepts. Maganda ito irecommend sa mga students, sa mga nag rereview for licensure exam, and sa mga engr. na gustong ma refresh ang design. Also, thank you for being responsive sa mga questions sa comment section. More power po!
Salmat boss :)
Sobrang helpful nito Sir!! Sobrang linaw ng pagkaexplain!! Salamat! More tutorials din Sir like columns, beam and slab design :)
yes po lalagyan ko pa ng crack and uncracked then other design analysis like columnd and slabs pati detailings. more to come po.
@@nioroskyengineeringonline8968 WOWOWOW!!! Aabangan ko ho talaga yan! Hindi lang ako at panigurado pati ng maraming viewers niyo po!! god bless sir!
@@nioroskyengineeringonline8968 blessing ka po sa aming lahat Sir!!
Salamat sir na refresh ulit ako.. More power sa channel mo sir 👍👍
salamat engr :)
Thank you po Sir Nioro. This is a nice refresher in designing footings. Parang college lang po ulit.
your welcome engr aragon, my former student. Salamat sa appreciation. see you around :)
We need more kinds of this tutorials!! Especially these times!! More power to you Sir!! 2nd replay ko na. :D Design of columns, beams and slab naman sana next :)
Soon to be uploaded ubder RCD playlist. :) wait for further announcements :)
May beams discussions na sa playliat ko under RCD
ang galing po at ang linaw ng pag kakaexplain, you deserve more audience 🙌
salamat sa appreciation mam. kindly share my channel to your friends and let them subscribe and watch my video lectures. more to come pa po. main goal ko makumpleto ko structural engineering courses then saka ako jajump sa softwares application and also to allied engineering courses.
wow, the explanation is very clear, sobrang natuto ako, sana may retaining wall din po :) looking forward to your lectures!!! God Bless
Salamat po mam :)
Thank you so much, sir. Very clear and madali maintindihan po. More lecture videos pa po and more power! :)
Nice lecture/presentation. Thank you for sharing.
Solid Engr! 🔥❤ Ano nga po pala reference book niyo? Solid din daw po na reference book ang Principles of Foundation Engineering ni MJB Castro.
Idol gawa kanang roof & steel truss.analysis at paano e add sa load computation. Thanks God Bless always lodi!.
Excellent and Very Clear Explanation
maraming salamat po sir. I am looking forward na magkaroon po tayo ng collaboration for a video lecture po sir :)
Thank you sa Lecture Sir. Matanong ko lang about sa Stability Check kung ano ang mga Load Combinations na gagamitin? Namomoblema kasi ako sa uplift kapag ginamit ko yung Load Comb na 0.6D + E/1.4 (NSCP 2015 Eqn 203-15).
thanks so much engr.,i've follow the lecture well and so clear,like it!
Thanks :)
Sir good evening. Yung Qnet actual (qna) po ba yun na yung allowable soil pressure (qa) ??
kindlyr efer to the discussion the difference between qnet and qa :) as a short answer allowable soil pressure is the maximum limit condition to carry load while net stress is the discrepancy of soil pressure considering the constraints of soil, concrete structure under foundation and pore water pressure.
Very informative video, by the way sir question lang. In what case nagkakaroon ng top reinforcement ang isolated footing? My other way of calculation ba na magdagdag ng top reinforcement to reduce yung size ng footing?
Good day po engineer!! Meron po ba kayong lecture sa rectangular combined footing?
Sir request lang po sana meron din po kayo tutorial ng edge and corner column footing based on nscp2015
yes will consider that in the future. will fill the other topics pace by pace
Good day po. Tanong ko lang po maguupload din po kayo ng lectures about sa design ng iba't ibang types of footing? Thank you po.
yes boss. square footing pa lang. follow ko na din ang wall footing, rectangular footing and combined for shallow type. also magdiscuss din ako ng may moment na load sa column para maanalyze ang transfer of moment from column to footing via bearing area and shear area
@@nioroskyengineeringonline8968 thank you po sir. Very detailed and helpful po ang mga lectures niyo.
Pati po sana eccentric footing sir. Thanks
Sir, good day po, meron po ba kayong sample calculation kag case 3 yung soil pressure?
Good Videos! Galing! salamat po. Pwede po mag request? sana po may design ng footing na may top bars at bottom bars.
Thank you sir. the best explanation.
dun sa 52:33 sa pagkuha ng Mu, saan galing yung 1/2? nakadivide na by two yung (3.575-0.5) na ah?
Is it okay na ang gamitin na Asmin is 0.002Ag kahit hindi nacheck ang Pmin? Hindi ba applicable ang 1.4/Fy pag footing?
Excellent and Very Clear Lecture.
Maraming salamat po sir tolentino. Its been an honor to me to be praised by the origibal and one true only master of caltech. Pillar as we call it. Salamat po sir dahil moat of my knowledge and confidence is nanggaling po sa inyo bilang studyante nyo po before and bilang mentor and coach during quizbee that lead us victories in those respective quiz competitions :)
Thank you po sir sa lecture, napakalinaw at detailed po. May tanong lang po ako sir, don po sa pagkuha nang As, ginamit ko po kasi sa formula ng Mu ay Mu=∅bd²Rn, then same naman po tayo nakuha sa value ng As na 5543.2797mm², ang tanong ko po ay kapag kinompare po yung rho minimum (p=1.4/bd) sa nasolve ko po na rho, mas malaki po value nung sa rho minimum kaya yon po gagamitin diba po? tas pag ginamit po yun magiiba po non ang As, As=8200mm² na po. Sana po malinawan po ako, hindi kopo kasi alam kung tama po ba idea ko. Thanks po sir!
Sir, pano po pag may transverse/horizontal loading, di ba po magiging moment sya? Pero ano po yung perpendicular distance po? To top of footing po ba or bottom? Salamat in advance po.
Sir Niorosky, meron din po ba kayo edge column and corner column footing?
For upload pa in the future
sir meron po ba kayo tutorial regarding how to design columns..thank u..
soon for upload
may rules of thumb po ba para malaman ang unit weight ng soil?
Hi. Kindly check the soil invrstigation report on the site. It will give you the information regarding soil properties including soil unit weight.
thank you for the video very informative!!!! just wanna ask po yung Fs=3.0 naka indicate po ba sa nscp 2015 na 3 agad gamitin if hindi indicated?
May reference book ka nyan Engr.?
sir may question ako sa pagkuha sa number of bars. what if sir we get the value of Rn then get the value of p(roh) and compare it to pmin(rohmin) then we can obtain the value of As then the number of bars? would it be possible? thank you sir!! and Godbless!!
ah. an old school style of calculations. usually if yopu will use rn (flexure coefficient) usually may table na tinitingnan yan. yan ang gamit ng Rn is may table na sinisipat then poof... may deisgn values agad :) pero if calculation piece lang din naman ang pagbabatayan then Rn is just derived from the original formulation so much better if iexercise yung direct calcs para nakikita yung mga changes sa sense ng values. note that the rho (reinf ratio) is intended for a least value of constraint to check whether possible flexural failure may happen but superceeded by the moment capacity of the section to resist load :) note that moment is a function of curvature or what we call ductility condition or simply rho :) whatever method you are going to use make sure you know its limitations and proper uses so that at the end of the calculations all values are usable :) cheers.
Sir , Galing po ng pag explain at detailed talaga yung mga facts nyo, tanong ko lang sir, ano po ang pinag kaiba ng NSCP 2010 sa NSCP 2015 ? mostly yung ibang vid 2010 nscp sa kanila
It is written in the front part of nscp 2015 regarding the changes before jumping on chapter 1. There is a list of changes there fro 2010 to 2015. See for your self and have some fun reading it :)
sir sa 1:25:43 kung sakali pong mas mataas yung ld ko sa ldmax, ang advisable lang po talagang i-adjust ay yung base at cc? Hanggang ilan po yung pwede kong iadjust sa cc po? Tapos sir pano po kung mas mataas pa din yung ld ko kahit na nag-adjust na po ako? Salamat po sir.
Hi as mentioned it means yung dimension ng Footing mo is kulang assuming 75mm na ginamit mong concrete cover due to exposure to earth. So puede pa magbago yung footing dimension since lalaki siya dahil kulang/inadequate yung development length nya as set forth by code provision then revisit the checking of OWS, TWS, flexure, and Bearing connection of Column and Footing :)
Excellent presentations
Hello po engr. Pag po ba rectangle yung column ichcheck yung one way shear ng 2 sides ng footing?
sa next video po boss magdiscuss ako ng rectangular footing. isasama ko ang bandwidth analysis.
yes both directions need icheck hanggat maaari pero may mga conditions reg analysis to minimize the checks but ordinarily dapat both sides sana specially pag may moments sa column on both directions
@@nioroskyengineeringonline8968 Noted engr. More power po sa inyo. Hoping for more vid lectures to come. Godbless po
sir, kung need ang dowel para sa bearing connection, ano ang length ng dowel?
Hi. It was already discussed in the video lecture roght after this topic. Design of rectangular footing :) kindly find it on my playlists by visiting my yt channel. "Patience and diligence is a virtue" :)
@@nioroskyengineeringonline8968 thanks sir. Already watch sir. tnx for the info sir.
Sir question lang regarding sa computation ng effective depth. as you have said in the video, ang effective depth is in between main and shrinkage bar. so d = T - cc - db. pag naman sa slab po sir. kasi ang ginagwa ko sa slab is D1= T - Cc - db/2 (bottom bar first lay) D2 = T - Cc - db - db/2 (bottom bar 2nd lay) since as you have mentioned ang footing ay slab din. therefore ganun din dapat ginagawa ko sa slab? then mo mali po yung ginagawa ko sa slab?
hehehe as explained in the video lecture, slab treatment of effective d is different in footing although a footing is just like a flat slab :) cheers. note that slab is continuously connected in a frame that is why the slab rebars act independently and effective depth d is found on the last layer nearest to the tension fiber of concrete and usually they are alternate in position since compression and tensions changes in position (positive and negative moment relations). Meanwhile, Footing has only one type of concavity if isolated type. so it was found out that the layer in between the main and temp is the location of the effective depth (does not change position with regards to compression and tension, see my discussion how footing bends when subjected for flexure).
i think this is the right for you to study deeply on different types of slab, slab as a shell element and slab as a plate element, slab as a membrane element, and slab as a layered element :)
so technically tama ginagawa mo sa slab as taught in your college days. :)
@@nioroskyengineeringonline8968 well explained sir. going back to college, i remember that slab has tension and compression. for left and right support, the tension is within the top of slab since negative moment occur on the support, while on midspan the tension fiber is at the bottom of slab since positive moment occur at the midspan. my next question is, how do i calculate the compression bars for the slab? is it necessary to use temp shrinkage or just the Asmin?
@@iangalicia8264 check if it passes the min condition based onthe grade of rebar. Not that in slab as a diaphragm suffers two types of bending, while in the foundation suffers only type of bending as discussed in one of my video lecture here in isolated footing. It will be different when mat ot combined footing. Soon to upload my video lecture reg on that.
Thank you sir. Combine footing din po sir. Thank you so much.
any idea po mga ka CE pano macalculate yung wide beam shear at punching shear na walang given na deadload at liveload? need ko lang po.
Salamat sir sa mga lectures po,,, sir nakatamsak na din po ako,, baka pwede po masuklian,,, salamat
sir pano po kapag lumagpas yung d/critical section sa footing?
how about d(dowel) sir
Hi. It was diacussed in one of my video lecture. In the topic of rectangular footing. You can use the same concept. Cheers.
Sir, pa request po ung meron pong dalawang moment
to be considered sa future video lectures :) noted on this
usually papasok yang desired problem mo as combined footing, future contents ng video lectures na gagawin ko :) cheers
sir yung "d" hindi ba sya sa mid ng main bar bale ganito (d=T-Cc-db/2) ?
hi. i already explained in the concept that the calculation of the effective depth of the steel bars found on footing is the space between top and bottom bars while on beam and column and as well as slab is at the rebar center. This is due to the action of the flexure found on the footing and found at that the perforation happening is in between the layer of the two directions of the bars ssince the spaace is limited and also the action seems orthodirectional. As a proof the cracks found on foundation failure assuming flecure alone is always found on that particular layer as proven by laboratorical experimentation. this is also stresses by one of the committe member of ACI which is committe number 318 in the personality of Macgregor, one of the authors of the RCD books that is good to read with. Notice that most of the reference books alwaays refer the concept to Macgregor since he was an expert of this design principle :) cheers
kindly watch again my video lecture regarding the principle of designing foundation as found on my playlist. it was mentioned there.
pls refer to this ruclips.net/video/2O2B39hIoDk/видео.html
also this one. happy viewing :) ruclips.net/video/J6yGNI7qRyk/видео.html you can validate my discussion by reading reference books authored by Macgregor and the likes, not review books since it has too many errors, sad to say.
Ok thanks sir...
Sir, what if corner column? yong Bo ay 4 sides parin ba or 2 sides na lang? TIA.
good day. as mentioned in the video lecture, the discussion for Bo done here are only for footings which is centered and whose critical area is not exceeding the footing bearing area. Otherwise there should be a consideration of shear center based on the location of the column at the bearing area of footing to be discussed in my future video lecture. cheers
@@nioroskyengineeringonline8968 thank you sir. very detailed ng discussion mo.
Paano po malalaman sa drawing kung anong type of footing configuration po?
Thank you po ng maraming marami sir!
salamat din ng marami boss
Thanks napanuod ko una hanggang dulo.
Dun po ba sa reduction factored phi(φ) is equivalent to 0.75. (32:33) yan po ba ang updated na nscp?
0.85 pa po kase gamit namin sa college.
Thanks in advance for the answer.
Please see the separate discussion on that matter. It can be found on my RCD playlist on reduction factoe. I think 0.85 can be fpund on nscp 2000 which is already obsolete :) nscp 2015 na po gamit natin. Cheers.
@@nioroskyengineeringonline8968 thanks sir. Papanuodin ko lahat ng video mo po.hehe
@@nioroskyengineeringonline8968 one more question sir. How about checking for the As min. Using 1.4/fy ρmin?
@@butikegtv3590 that formula are for beams. Different from foundation as mentioned in the code.
@@butikegtv3590 none. Reason is the as most likely will fall under lower than Asmin or maybe higher than Asmin but wont exhibit higher than potential Asmax since the footing is cobsidered as a slab element where sectional is small as well as effective depth. We learn before taht rho is As/bd so if the d is small then As is large. So in terms of Asmax since d is very small then rho is very large. You will notice it anyway. That is why code does bot provide Asmax condition for footing.
sir ang ganda po ng lecture nyo, very detail. sir meron po kayo video kung paanu icompute yung DL and LL? yung given po sa problem nyo
Hi most likely the values for the values for DL and LL will be calculated from the force members transferred from the column to the footing and tie beams. There will be a separate video lecture for that :)
@@nioroskyengineeringonline8968aabangan ko po yang vid na yan sir.hehe pero is it possible po sir na makakuha ako ng values ng DL and LL sa staad?
@@leobanco597 yes you can have the valuea from any design software that is capable to calculate forces like staad, etabs, sap, etc. Or even an excel design program can do also the same job by programming it appropriately. The most precised calculation is through finite element analysis since it uses boundary conditions.
@@leobanco597 yes you can have the valuea from any design software that is capable to calculate forces like staad, etabs, sap, etc. Or even an excel design program can do also the same job by programming it appropriately. The most precised calculation is through finite element analysis since it uses boundary conditions.
@@nioroskyengineeringonline8968 thank you sir.
Pano mo po nakuha yung Pu?
taken from the structural analysis fo the superstructural components as per load transfer is concerned. cheers :).
Sir pano po magdesign ng eccentric footing yung sagad po sa property line?
Hi isa yan sa mga next topic. As discussed centroidal pa lang yung loadings and wala pang moment as a load. There will be a separate discussion on that since it will apply concepts on strength of material like shear centre.
@@nioroskyengineeringonline8968 Thanks po sir abangan ko po.
Sir ask ko lang po na paano po rule of thumb or computation ng depth at thickness ng footing if di po given sa problem? Thank you po sir
hi. maraming constraints yung pagselect ng thickness and depth. as for my actual design projects, nagrerely muna ako sa soil bore hole log reports para madetermine ko yung desirable depth and thickness ng footing. if walang soil investigation report or just purely theoretical yung gagawin mong calculations as per classroom puposes lang, You can Try at D = B as mentioned in Terzaghi's condition where D = depth of footing, B = least dimension ng rectangular or diameter ng circular footing. Using Soil bearing checks then makakakuha ka ng D and B, then for the thickness ng footing you can use the One Way Shear or Two Way Shear.
Other way naman is gumagamit ng presumptions ng multiple of 55 sa depth of footing if backho ang gagamiting panghukay since ang nababawas sa isang kahig ng backhoe is most near to 75mm (3inches). then inaassume na wala munang lupa sa taas ng footing, nagkakaoverestimation ng kaunti.
In practice, nagseset kami agad between 1.0 to 2.0 meters since usually duun ang desirable depth basta hindi dangerous sa settlement or other factors that might give failures sa foundation especially liquefaction effect (uneven settlement). Then chinecheck namin using allowable soil bearing pressure and cocompute na kami ng thicknes required using one way or two way.
@@nioroskyengineeringonline8968 thank you po sir for the info. Godbless po sa inyo
@@angelicapenaflorida1903 salamat. you can also add me up sa facebook account ko. just search my name and i also entertain question through facebook messenger. Nioro Guevarra Furiscal. ALso please subscribe to my YT Channel :) Thanks and regards
Thank you sir! great video
Thank you dito engr!
Sir, pano kapag ako mismo ang gagawa ng design.. no details given..
Then consider constraints. However it is very important to know the soil bearing capacity and the loads it should carry.
@@nioroskyengineeringonline8968 sir, for the fence lang poh. dbah load itself lang ang meron? need p din bang malaman ang SBC nya kahit for fence lang ??
@@zandralyninfante7028 all structural members should conform to the code. Please refer to our design code otherwise you dont want that fence to overturn and kill people whose walking beside it. Safety first before everything else.
@@zandralyninfante7028 dont forget for seismic and wind as lateral load. :)
Hi engr, I have a query with regards on finding the qna. Hindi ba dapat qnu/FS siya instead of qu? kasi if iplug in yung values from the solution instead of dividing the summation of weight values ay namultiply siya by the FS.
Hi. If you are asking for dimension assessment its qult first since how can you get qnult if you dont have the size of footing to deduct as an effect of stress to be transferred on the footing itself :) also as set forth in section 413.3.1.1. Cheers
Also by logic, is it right qna is greater than qult whereas qult is the factored stress? Note that qult is the magnified value of stress and qna is the net condition lower than qult due to deductions of stresses transfered from generated stresses above.
@@nioroskyengineeringonline8968 I'm just wondering that the paired equations for q_ult would be q_all and if net would be qn_ult and qn_all. Then basing with NSCP it is not how it should be paired. Anyway, just confirming things. Thanks
@@engineersspace2024 for direct basis, see any reference book authored by braja das or muni buddhu. Cheers.
@@engineersspace2024 @norielepaulcruz3242 q ult is the reference since we are approximating bearing resistance based from forces that understand service state conditions. Note that it is set as a min condition for approximating sizes of footing then note for final checking the qna was taken to assess proper stress where stress of soil was deducted to q ult since size is determined as shown in 1:29:33 for final checking.
Sir yung unit weight po ba ng concrete is given o constant?
Its a constant
@@nioroskyengineeringonline8968 thank you sir!
good day sir! request po eccentric footing design. tia
in the future it will be considered and for upload :)
10qs
Sorry boss, pero ang hirap sundan. I think mahina talaga ako kasi paulitulit ka na magsalita di ko pa din magets sa dami ng redundancy mong pinagsasabi.
Ok lang yan. You can read books as main material for reference which is dun ko din binase discussions ko. Cheers.
sir good morning bakit my 0.75 sa 0.17(10)sqrt(24.21)? ruclips.net/user/clipUgkxa2P7dNEmsfm3TsTmN7Lk38gWkK1n5YTI?si=43mUpk0iqlNtX1Dg
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