Thank you for explanation I dont know why you assumed one mode shape to be = 1 While you can calculate it by quadratic formula hope i get answer Regards ,,,,,
its just to simply the equation.we can solve the equation in many ways i have explained in that manner you can use another method like u said quadratic equation.
Generally, mode shapes are not represented by the number, because of it just the way the oscillation occur (shape), so a number is taken as reference and others are calculates as a relation to it
any book on seismic design will give u better idea. but i would suggest the best guide is please refer UBC or IBC 2015. these are building codes with seismic loading. so once you are aware of all codal provision any book or any data from internet will be sufficient. in case of further query u can reply, we will be pleased to answer you!! Thanks a lot for compliment.
THE PROCEDURE IS SIMILAR LIKE 3X3 MATRIX BUT TO SOLVE 5X5 MATRIX MANUALLY ITS DIFFICULT BUT YEW WE CAN SOLVE A MATRIX 0F 5X5. IF YOU KNOW LIL BIT C++ OR JAVA PROGRAMMING THEN IT WUD BE VERY EASY TO SOLVE 5X5 MTRIX.
@@joseemmanuelnavarro7210 references are based on Indian Standards IS 1893. I have Started seismic loads based on UBC-1997. So probably ill cover almost all major design code.
Sir to get mass matrix such as 630 and 839 and 1006 you divided the weight of each floor by 9.8 ya phir aapnee seedha har ek floor ka weight liya hai ya har floor ke weight ko 9.81 se divide karke liya hai
how would steel bars effect the modulus of elasticity of concrete section? I need the moment of inertia and modulus of elasticity of reinforced concrete section with effect of percentage of steel. actually I need it because I need stiffness of column to calculate the stiffness of whole story of the building. I modeled a RC building in etabs. etabs gives me stiffness of the story after I run the analysis. but i haven't even run design. How did it calculate the story stiffness even before the reinforcement percentage in column is determined. Is it calculating stiffness of columns with no reinforcement in it ? or is it calculating stiffness of column with minimum required percentage of steel? will it change the stiffness of columns and then the stiffness of whole story after I run design in accordance with the amount of steel it calculates for each column? is the stiffness of the whole story sum of stiffnesses of all the columns of that story?
first of all apologies for late repy, since ur comment went into the spam section i couldnot see the comment at all. your first question is why the stiffness is calculated before steel reinforcement provided. ans: i have not done a deep research in the software the the concept says that your moment of inertia will be based on cross section dimension of members and if considering the column as a composite member then hardly the percentage of steel will affect the MI of the section. lets take a rectangular section I=bd^3/12 so MI wont be affected but lets say its a composite material so it may change the C.G if R/F provided in not symmetrical but in this case i.e column the r/f is similar in the c/s plan.
secondly the stiffness of a member let it be a column or beam depends upon the unsupported length and cross section area of that member. after analysis also the stiffness will hardly change means there wont be any change for a particular member. hope i answered your query in case u have further doubt please feel free to ask. for stiffness just remember one thing = EI/L
E will change as per Concrete grade so shall ur stiffness may vary but again it depends upon the adjacent & nearby members E. so ultimately while calculating stiffness we take care on one more thing that is how ur member is supported and where it is located.
@@Sacademicus thank you for quick response ,excuse me I still believe no need to divide by K and lamda it will be equal to (ferquancy)^2 since the equation is stiffnes materix -w^2 *mass matric =0 ............ just i am discussing it to clear the points for me . again thank you For your Good Explaination .
Ye we can but Since the height is more there will be more number of mode shape not just what's for this problem but the concept will remain same... Thanks!!!
their are basically 2 methods: 1.Static Method 2.Dynamic Method Dynamic is further classified under a. Response Spectrum method the current topic & b. Time history Analysis Response spectrum method is widely used!!
Nice Observation!!! The stiffness depends on following factors: 1. Support conditions 2. Member length/Heights 3. Modulus of Elasticity 4. Moment of Inertia So even if the storey height is same the stiffness need to follow all the above criteria and this it can vary.
Video is really good..... Appreciated. But the need some value addition. Where in an explanation is supposed to provided... Why modal mass should be above 90%.
book name is- Illustrated Design of Reinforced Concrete Buildings by Dr. V L Shah & Dr. S R Karve. Refer Chapter 13 for this Problem. PDF of complete book is available on www.EasyEngineering.net
@@gadiswamy7373 drive.google.com/open?id=1OINPEWp7bWKU9xmjF1RGJFOcNs4T8ePs please download the complete book link from here. meanwhile i have send the specific chapter through mail.
@@beingnatureid7582 I ,E & h are constants so even if we don't assign any numeric values to these terms we can solve the equation and get the result. but if u want to calculate value of I then u have to assign certain section to your member. for E it depends on material property . in this problem u dont need a value for I.
sure for M.Tech Structural Engineering Standard, i think even this much of explanation is also not available in most of the engineering colleges who are providing M.Tech.
In the PPT there is Typo where M2 is written Twice the last M2 will be M1. The mass of each floor may vary as per actual building dimensions otherwise the matrix will remain same. In case if u have specific query regarding mass matrix please let me know so that I can explain.
I searched for this type of video for many days and now I found it, thanks for the video and by the way it was a great explanation.
Thanks a Lot
This video's taught me exactly what I needed. Thank you!!
Thank you for sharing your knowledge
Very helpful video 👍👍👍.
Sir can u upload same video on circular and intze shape water storage tank.
great explanation, thanks for your effort.
VERY NICE DESIGN
Your all videos are really helpful 👍 great efforts 👏
Could you give short explanation series of IS16700
Thank you!
I'll resume uploading videos will consider your suggestions
Do you another example ... Ineed it only for g plus 1
Sir, nice video. May I have the link for previous video for calculation of mass matrix?
What's the title or link of the video explaining calculation of masses?
Thank you for explanation
I dont know why you assumed one mode shape to be = 1
While you can calculate it by quadratic formula hope i get answer
Regards ,,,,,
its just to simply the equation.we can solve the equation in many ways i have explained in that manner you can use another method like u said quadratic equation.
Generally, mode shapes are not represented by the number, because of it just the way the oscillation occur (shape), so a number is taken as reference and others are calculates as a relation to it
Very good video .. a question of which book or guide can I guide myself for the procedures of the whole calculation?
any book on seismic design will give u better idea.
but i would suggest the best guide is please refer UBC or IBC 2015.
these are building codes with seismic loading. so once you are aware of all codal provision any book or any data from internet will be sufficient.
in case of further query u can reply, we will be pleased to answer you!!
Thanks a lot for compliment.
Sir what is value of I in the expression 6×12EI/h^3
Sir , you have made the calculations for free vibration, but what will be the analysis procedure in case of forced vibration ?
I have a question, I have a 5 storey how to get the determinants? with 5 lambdas? Using Matrix
Thank you very much!
THE PROCEDURE IS SIMILAR LIKE 3X3 MATRIX BUT TO SOLVE 5X5 MATRIX MANUALLY ITS DIFFICULT BUT YEW WE CAN SOLVE A MATRIX 0F 5X5. IF YOU KNOW LIL BIT C++ OR JAVA PROGRAMMING THEN IT WUD BE VERY EASY TO SOLVE 5X5 MTRIX.
Thank you! I used Online 5x5 calculator instead. Hehe
@@Sacademicus Sir I have a question, what code did you use?
@@joseemmanuelnavarro7210 references are based on Indian Standards IS 1893.
I have Started seismic loads based on UBC-1997. So probably ill cover almost all major design code.
Can u upload a video of mannual seismic design??? How to design the members after we obtain the storey shears
Good Vidio,but the unit of mass and weigth is the the same?
Sir to get mass matrix such as 630 and 839 and 1006 you divided the weight of each floor by 9.8 ya phir aapnee seedha har ek floor ka weight liya hai ya har floor ke weight ko 9.81 se divide karke liya hai
For SDOF of portal frame has how many mode shapes and 4 floors has how many mode shapes???
Please give your answer
how would steel bars effect the modulus of elasticity of concrete section? I need the moment of inertia and modulus of elasticity of reinforced concrete section with effect of percentage of steel. actually I need it because I need stiffness of column to calculate the stiffness of whole story of the building. I modeled a RC building in etabs. etabs gives me stiffness of the story after I run the analysis. but i haven't even run design. How did it calculate the story stiffness even before the reinforcement percentage in column is determined. Is it calculating stiffness of columns with no reinforcement in it ? or is it calculating stiffness of column with minimum required percentage of steel? will it change the stiffness of columns and then the stiffness of whole story after I run design in accordance with the amount of steel it calculates for each column? is the stiffness of the whole story sum of stiffnesses of all the columns of that story?
first of all apologies for late repy, since ur comment went into the spam section i couldnot see the comment at all.
your first question is why the stiffness is calculated before steel reinforcement provided.
ans: i have not done a deep research in the software the the concept says that your moment of inertia will be based on cross section dimension of members and if considering the column as a composite member then hardly the percentage of steel will affect the MI of the section.
lets take a rectangular section I=bd^3/12 so MI wont be affected but lets say its a composite material so it may change the C.G if R/F provided in not symmetrical but in this case i.e column the r/f is similar in the c/s plan.
secondly the stiffness of a member let it be a column or beam depends upon the unsupported length and cross section area of that member. after analysis also the stiffness will hardly change means there wont be any change for a particular member.
hope i answered your query in case u have further doubt please feel free to ask.
for stiffness just remember one thing = EI/L
E will change as per Concrete grade so shall ur stiffness may vary but again it depends upon the adjacent & nearby members E. so ultimately while calculating stiffness we take care on one more thing that is how ur member is supported and where it is located.
nice presentation , I have one question reqarding k why you divide (wn)^2*m over k . regards
Just to simplify the equation with one unknown so that we can solve a simple quadratic equation.
@@Sacademicus thank you for quick response ,excuse me I still believe no need to divide by K and lamda it will be equal to (ferquancy)^2 since the equation is stiffnes materix -w^2 *mass matric =0 ............ just i am discussing it to clear the points for me . again thank you For your Good Explaination .
U can do either way . just to simplify the Quadratic equation i adopted this approach there are many other ways to solve.
thank you so much
Sir good lecture....
Sir I have one question other than this topic ..what is the purposes of coping in brick wall ...
coping is basically provided for aesthetic point of view and also to shed water and protect the brickwall!!
Thank you so much!
How to do for multistoried building in SAP 2000
I hav an doubt..why we consider maximum number of modes in response spectrum analysis
Sir how to calculate masses
Can we solve 20 storey using above procedure?
Thank you for your Explanation
Ye we can but Since the height is more there will be more number of mode shape not just what's for this problem but the concept will remain same...
Thanks!!!
what are methods of EQ analysis ???
their are basically 2 methods:
1.Static Method
2.Dynamic Method
Dynamic is further classified under
a. Response Spectrum method the current topic &
b. Time history Analysis
Response spectrum method is widely used!!
thank you
Sir, please check you stiffness matrix, there is a mistake.
Sir can u please share the PowerPoint so that I can practice.
As the storey height is same in storey 2&3 how does the stiffness varied ?
Nice Observation!!!
The stiffness depends on following factors:
1. Support conditions
2. Member length/Heights
3. Modulus of Elasticity
4. Moment of Inertia
So even if the storey height is same the stiffness need to follow all the above criteria and this it can vary.
@@Sacademicus how have you calculated then? you have showed a formula to find k but now you are saying other paramenters?
@@nimeshchhetri9745 see as the column sizes r different in different storeys, so that constitutes change in stiffness values here.
where can get ua previous video ..... i mean video for load calculations
Check the playlist
@@Sacademicus can u plz give the name exactly where we get that video
Video is really good..... Appreciated. But the need some value addition. Where in an explanation is supposed to provided... Why modal mass should be above 90%.
That is IS 1893 clause
you only calculated the column stiffness, why you did not calculate the stiffness of the beam?
Share ppt i need it
please send me above PDF and link or PDF of how to calculatehow to calculate mass modal please send me as fast as possible
share ur email id
book name is- Illustrated Design of Reinforced Concrete Buildings by Dr. V L Shah & Dr. S R Karve. Refer Chapter 13 for this Problem.
PDF of complete book is available on www.EasyEngineering.net
@@Sacademicus swamyg555@gmail,com
@@gadiswamy7373
drive.google.com/open?id=1OINPEWp7bWKU9xmjF1RGJFOcNs4T8ePs
please download the complete book link from here.
meanwhile i have send the specific chapter through mail.
Sir u didn’t explain about “ I “ in stiffness formula
I is the Moment of Inertia of that member and h is the effective length & E is the Modulus of Elasticity of the member.
What value of I we have to take
@@beingnatureid7582 I ,E & h are constants so even if we don't assign any numeric values to these terms we can solve the equation and get the result. but if u want to calculate value of I then u have to assign certain section to your member. for E it depends on material property . in this problem u dont need a value for I.
how can i get this text to download..can you please share it?
share your mail id ill send.
@@Sacademicus thanks so much...efl2@hotmail.com
Check Your mail..
@@Sacademicus thx so much...ı got it....can i please ask you one things...if you have any example of pushover analysis done in Midas Gen or Sap2000?
@@UCTUCT bhai i have not worked in Midas so currently i dont have but in case i get ill share with..
sure for M.Tech Structural Engineering Standard, i think even this much of explanation is also not available in most of the engineering colleges who are providing M.Tech.
I dint understand ur comment sir, do we need to improve on this or is it helpful?
@@Sacademicus explanation is good, even this much explanation is not available in so called engineering colleges. That's my point.
@@nemalavenkatesh Thanks a lot for appreciation.
Can you share your ppt please
este analisis sismico en castellano habra
lo siento
no, esto es en ingles.
mi no espanola.
mass matrix is not match.
plz show the mass matrix calculation
In the PPT there is Typo where M2 is written Twice the last M2 will be M1.
The mass of each floor may vary as per actual building dimensions otherwise the matrix will remain same.
In case if u have specific query regarding mass matrix please let me know so that I can explain.
Please upload files
Will do that
Bhai concept clear nhi huva aapki vedio se
Doubt puch lo mai explain karunga
for concept refer nptel
thank you