Design of a Singly RC Beam Section Example 1 - Reinforced Concrete Design
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- Опубликовано: 9 сен 2024
- A basic example problem showing how to design a singly reinforced concrete beam section for a simply supported beam with dead and live loading.
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Still love to watch this video over and over greetings from Kuwait.
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I'm a civil engineer from Iraq and I worked for 21 years in construction and design , and I find your videos fascinating and very helpful for students.. Are you a student too? I wish you the best because you understood the concepts and principles of reinforced concrete .. Again, in real practice engineers may face many challenges and understanding the behavior of concrete is so important ..Keep up the good work !!
asadalbadia thank you for the kind words.
carlos Fernando de de de de de utu hoje
Not a civil engineer (mechanical), so this class is already a bit out there, but I like the practical application of mechanics of materials. Taking this class while studying abroad. It's really difficult to get help here because people work alone and sometimes the questions I have, the TA and Professor don't seem to understand, and I was struggling to learn the material in class or with the book. Thanks to your videos I feel like I understand the material much better now! There might be a chance for me, yet!
Thank you for sharing! It's really good to know that my videos are helpful and effective for motivated learners. Plus concrete is awesome!
awesome video...extremely clear ,for such a tough topic...thanks
I like how you explain it... thank you.
I'm from iraq
Thank you for the hard work ...very helpful
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Plzzzz continue making RC videos ; design T beam , R beam doubled reinforced
And question ... What if the steel ratio not satisfying the limits ?
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First of all, i want to say thank u very much! i got many good things from your nice tutorial.. to make more perfect would add more example and cases...
Best regards
I am a structural engineering student from the UK, your videos are great but we use metric (kg, kN, m) units and you guys use imperial and slightly different codes maybe.
Thanks man.. the video is clear and helpfull
Great stuff thanks man this has been very helpful
Thank you dude! How about a T section beam example? or a doubly reinforced beam.. :D
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this is very helpful, nice job, thank!
+Phuc Vu thank you!
very nice explanation sir, easy to understand. thanks. do you have more videos?
Why did you pick 0.009 for the steel strain at the beginning. Why not 0.005.
+Brittany Zipperlen choosing the strain value (or target reinforcement ratio) is technically the designer's choice. If you chose the reinforcement ratio associated with 0.005 tension steel strain, it's possible that when you specify the design steel area from the required area, you could end up in the transition zone for the strength reduction factor or possibly worse (i.e. overreinforced, although unlikely). Some books recommend using a target reinforcement ratio = 0.18*(fc'/fy) which corresponds to a tensile strain value of 0.009 (for fc' = 4 ksi and grade 60 steel). Typically, targeting a reinforcement ratio around 1%, results in a ductile, tension controlled design. Congratulations! This is my longest response ever. Westssssiiiide!!
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How we know that strain in steel is 0.009 or it can be change?, since we use 0.004 it is correct plz explain I am confused in taking strain in steel
When you determine b=14 inches and d=27 inches, why don't you verify the width is wide enough to provide enough cover and space for the rebar you chose? Also why don't you specify the final height? Are those not common things to check during the design process?
Great video by the way! Very helpful!
Brian Wisner Thank you for your comments. I chose not to go into the detailing since the goal is to first get an estimate of b,d, and As. The clear cover and spacing checks would definitely be next.
Is the d/b ratio of 1.5 to 2 also applicable for S.I. Problems?
Good one. Totally different from what I have learnt. Are there any methods also.
? We use Mu =.156fcy using BS8110
How do I know when use 1.2 D + 1.6 L or 1.2 ( wL^2/8) + 1.6 ( wL^2/8) ? I have some confusion with when use it on or another.
Hi... thanks for the video... I am curious about a couple of things. 1) I noticed that you didn't calculate the weight of the steel in your check against the assumed weight. It's only 11.77 additional pounds or about 2.7% more. Do you typically consider the weight difference between the concrete and steel to be trivial enough and just calculate the area of the steel as the weight of concrete? There is a huge difference 150lbs/ft3 v. 489lbs/ft3 2) Would the design benefit by accounting for more concrete surface friction on smaller bars resulting in a stronger beam, or is this relatively trivial? It would seem to me that as the beam is loaded there will be a sheer load between the concrete and the surface of the bar, as well as a sheer load on the dimples on the bar. Wouldn't more surface contact between the concrete and bars result in a stronger beam? Thanks again!!
hi, thank you so much for these helpful videos.. could you please upload videos for slab design??
I like it.
When the beam dimensions change, the beam weight will change. How can we just choose a number, 500p/f here, to get a correct beam size? Are you saying that beam weight is irrelevant to choose beam dimensions?
Mindy Xu as long as the final design weighs less than the assumed weight the beam should be safe. if the final design is greater than the assumed weight, then you can go back and update your required moment strength and check the design by analysis.
structurefree searching for this, thanks
Doesn't Dead Load mean that its the weight of Beam itself? If yes then why do we have to add another load of 0.5 k/ft?
Give me tips for why you choose b=14inch than 12 or 16. Is there any pattern?
does the weight of the beam (Estimated) comes with the weight of the Steel Reinforcements?
What's with the # bars 9, 10 , 11? Are the type of bars? If so, then where can I get the lists of type of bars? Thanks for a reply.
which code did you use please
Hi! Im just gonna ask some questions. Is assumed beam weight the same as the concrete weight? Second, is the reinforced ratio the same as the cover ratio? Because Im studying these topic and I came across those two terms ( concrete weight and cover ratio ). Thanks for the reply and btw, nice tutorial!
How to assume that the value for epsilon s or t is 0.009?
If additional reinforcing bars are placed only in the compression side of a reinforced concrete beam, will they add significantly?
Are you referring to nominal moment strength?
how do you know the A# ?? the 1in^2 and 1.27 and 1.56??
I saw the aci code table but these number you have used are for spacing 12 !? help please
This should be obvious with simple math... the bars are round... the cross-section is a circle... the area of a circle = pie r squared. What's not obvious is that Imperial bar appellations represent rebar stick diameters in fractions of an inch, such that #8 = 8/8 inch = 1 inch diameter.. so a #9 bar is 1.125" and #10 is 1.25". Therefore, a #10 bar should have and area of 1.2271 but the problem comes with the our material labeling system. Experience tells us that a 2x4 pine stud is actually 1.5x3.5, and a #10 bar is not actually 1.25"... it's slightly bigger, so we have to look at the material specifications to find the area. which is 1.27.
Check out rebar-info.com for the tables.
+Mansour Mohammed The areas are based on the designation of bar sizes. For #3 through #8 bars, the diameter = bar #/8. For a #9 bar, the diameter is 1.128", so that the area of a #9 = (pi/4)*(1.128")^2 = 1 in^2. For a #10 bar, the diameter of 1.27 in is convenient, since the area of a #10 = 1.27 in^2.
need the full course of beam design.....is it completed yet?
What is the Strain used in Rho min? Epsilon = 0.04?
design the cantilever beam by the given s=30cm c=200 I class work,l=1.5m , 10k/n ,60 k/n plze help me
I have one question, is this the European or the American method of designing?
Ogidan Olamipe it's a mechanics based design approach based on strain limitations...i use the american concrete institute code requirements (ACI 318) for load and resistance factors.
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why m= wl^2/8?
isnt the maximum moment in the middle which is L/2 ?
why 8 ?
WL/2*L/2-WL/2(L/4)=WL^2/8 Ay reaction by distance minus WL/2 by the center L/4
good
Ravindra vaghela c
am 3rd year civil engineering student so am interested
Sir, I have a question, why do we pick a value for Es?
+Roumel Alvarez Are you referring to the strain?
structurefree Es is assumed to be yielded? hehe im actually on the process on making a proposal for RC design in our school :D
R.C.beam or as reinforced beam an construction not just being plan but in indonesia really either in this ultimated concrete pass break.just mention insymbol.thanks.KPAD.
Awesome! Parhaps a example on shearreinforcement design? :D
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Christian Pisano
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36 hours till the PE exam and I'm watching this... Does not bode well.
I have a question which am struggling to solve is it possible that you send me your email and you do solve it step by step please
Max steel ratio is .05 not .005 as you say above.
interesting......
hi class of Okeil
Who?
It would be better to use SI units
explain problems sir please ,Tuesday is exam
Chuck Norris has never shown interest in structural design. I guess he would want to know where to punch to bring down a building.
I really hate Structures
Especially because a software could do the job