Etabs 2015 - Response Spectrum Analysis

[@nasratullahamarkhail3217]

Dear Sir, You may not know how this video solved my big problem and made my life easy....I have never ever seen such complete and clear video even from the developers of Etabs and SAP2000 software. ..Sir, Please make such comprehensive videos on ''Time History Analysis'' and ''Pushover Analysis''...Waiting to hear from you soon....Thank you so much for the great work.....

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail yeah ...sure..

[@PoojanMistry]

Why you don't use IS code? Pls use is codes

[@civilknowhowtutorials7100]

Kindly note that,those want to apply response spectrum analysis according to Indian code,please use scale factor as I.g/2R instead of I.g/R.

[@beenay18]

what value should I use for "I" and "R" according to Indian Standard? only "I" I know in Indian Standard is "Importance Factor". Is Occupancy Factor same as Importance Factor? Should I use value of I=1 for residential building? If not what will be the value of I for Indian Standard? And Only "R" I know in Indian Standard is "Response Reduction Factor" which is R=5 for special moment frame. Is "Response Reduction Factor" same as "Response Modification Factor"? If not what value should I use for "R" for Indian Standard? I used same value of scale factor as yours in my model ie 1225.83. And got Fx of RSmax= 124% of "Fx of EQx" and Fy of RSmax=114% of "Fy 0f EQy" " would I be designing the structure stronger than necessary if "Fx of RSmax" or "Fy of RSmax" exceeds 85% of "Fx of EQx" or "Fy 0f EQy" respectively? Also my sumUX, sumUY, sumRX, sumRY and sumRZ value exceed 0.9 in mode 7. So, should I reduce the number of modes to 7 or assigning any number of modes greater than 7 is ok? All of my sumUZ value is zero but RZ value is not. Is it ok if all my sumUz values are 0? should all sumRZ values also exceed 90%?

[@sandipchhetri6623]

I=1 and R=5 will do for residential building. The default no. of modes is 12, and if 90% of the building mass gets excited within 12 modes, then you don't have to change anything. Uz is basically displacement in z-direction, and earthquake force being applied in lateral directions only, we are bound to get Uz zero. Yes, sumRZ should be > 90%.

[@afzalandthedreams]

Dear Sir could you send me the above etabs model to my mail

[@MdAhmed-vg3dn]

can u please provide reason why we use (i. g/2R)? instead of (i. g/R)

[@afzalandthedreams]

@@MdAhmed-vg3dn Design base shear by dynamic methods shall not be less than same calculated by equivalent static method hence result forces must be augmented by a factor according to code IS 1893-16 7.7.3. As far my knowledge there is no such similar clause in international codes. above increments operation is only required for forces, not deflections and drifts according to code, it is a question of rationality rather than the benefit. Initial Scale factor IG/2R is nothing do with the code, it is part of the formulation. if spectra acceleration is normalised by g (unitless) we should use IG/2R. if you happen to work with field spectra with acceleration where it is not normalised ( units are in m2/s) then use I/2R.

[@thedhungels]

BEST OF THE BEST EXPLANATION. THANKYOU 🖐🖐🖐

[@md.mizanurrahaman9739]

Thanks a lot,Really very clearing tutorials for spectrum analysis.Sir Plz make such comprehensive videos on ''Time History Analysis'' and ''Pushover Analysis''.I am waiting for your response.

[@bestvideos8844]

Best explanation i have ever found.

[@faizurrehman2523]

Thats fantastic and career shaping video. Need more like this.

[@m3sman121]

Nice and clean video small and accurate illustration thank u very much keep going

[@civilknowhowtutorials7100]

+Muhanned Othman Glad to hear that...thank you..:-)

[@madhusinha2427]

How to you calculate long-period transition period?

[@evanah-taningauchun9436]

I love your work my brother... beautiful

[@pushkardeshpande3172]

How to put response spectrum in Load combination?

[@hypnose65]

Why Cd (Deflection Amplification) factor is not used at 8:53 time?? Help me please

[@aymansaeed3324]

how can i find 0.2 Sec spectral Accel. Ss ?? 1 Sec spectral Accel. S1 ?? and long period Transition period ?? For the Response spectrum and the static Ex.

[@frozanbarakzai1136]

Thanks a million for your useful videos and content, please do keep it up!

[@civilknowhowtutorials7100]

+Farzad Hakimi thank you....yeah sure..:-)

[@ujwalms4308]

how was the calculation done for Ss and S1 values

[@CEADACADEMYcivilengineering]

How can analysis the RS by using 1893:2016 and push over analysis

[@santoshnarayan3603]

Should we design the building for response spectrum analysis results?

[@mittalrit]

Hi, Can you please tell in case we have a Importance factor more than 1, what happns or what shall be changed in static definition of the Earthquake, because, otherwise we get a difference in base shear values after application of scailing.

[@nguyenthinh2301]

Thank you so much for the great work! This video is very usefull.

[@ajayramani9383]

How to see shear force distribution in specific storey

[@ayadjasim9911]

Great very easy and power video

[@ratankumarbiswas336]

Sir, it is a nice lecture.It help us very much as well as students. It will be more helpful to me if you kindly mention the name of good books for dynamic analysis. Thanks. Thi

[@suliman9058]

If i am not permitted to use static analysis should i use ig/r scale factor or not please

[@syedzakir091]

How to select the type of seismic design method i.e static or dynamic for an RCC building ?

[@ezzatullahtemury]

Thank you for your nice and useful videos! If we have three different structures. the plan is one but the structure is different. 1) the structure is made of columns and beams. 2) the same add a few shear walls. 3) no columns and beams only shear walls. if possible to do dynamic analysis for all of them and compare the result. would be nice of you.

[@6arash9]

please tell me why you didnot make acombination between the horizental forces?

[@beenay18]

should scale factor in x and y direction be same? can i scale them by different amount so that both of them produce 85 percent of static base shear.

[@hakimuddinshamsi5663]

how do we assessthe .2 sec and 1 sec. response specterum.

[@adirajasimamora9720]

Dear sir Does the scale factor have to be the same for x and y direction after re-scaling?

[@sayeedhussaini8806]

Nicely explained.....best ..sir

[@ankurkumarsrivastava4125]

Plese explain the modal participating mass ratio table

[@aamirsheikh9789]

Sir can you please upload a vedio how to to modelling of a mass tuned damper in a building

[@luismendietaelena9332]

Thank you very much for this!!! My question: So after re scaling, we get a 2753.25 value, wich is introduced as the new scale factor, on the load case RS. Therefore, now our new R (response modification factor) gets to be 9806.65/2753.25=3.56. (and before it was R=8!). Is there any section of the code which allows this change? or is this justified by saying that we achieved the 85% of the base shear?. Finally, just reminding the audience, that the displacements values now will have to be multiplied by 3.56. Thank you, Sir!

[@hassanbasil1350]

in defining RS case y u take U1 & U2 instead of U1 & U3 ?!

[@nasratullahamarkhail3217]

ASCE 7-05, in order to consider the live load for effective seismic weight calculation says ''In areas used for STORAGE, a minimum of 25 percent of the floor live load is considered''. Do we have to consider this 25% of live load in mass source for office or residential buildings as well or only for areas used for STORAGE?

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail it depends on the type of buildings n the live loads applied...it is better to take 25 %

[@beenay18]

what do "Sum UX" and "Sum RX" in "modal mass participation ratio" table mean?

[@NTC]

could you please provide the geometry layout of this building ?

[@nupurdas5413]

What as per is code and please tell the clause and code

[@carlosgarciafluxa3538]

Thanks for the tutorial. A question please. If I must find the forces in each story for do the diagram of the sum modals diagram. Where I should check? Thanks.

[@maunikmevada9115]

What is the difference between given time period in load pattern and getting time period after analysis ???

[@danielbrhane6537]

Sr. I am using G+10 model which one is more appropriate to analysis static or dynamic analysis ?

[@nemalavenkatesh]

may i know the difference between civilknowhow and fieldready

[@hassanhumayoun2797]

what are these factors ? R,Omega,Cd and I . and where can i find out them and how can i find there value? are the predefined in the code or they depend on the area in which the building is located?

[@aimuthiacitrautami4514]

Hello, I'd try to answer this. Usually, we can find these factors on you country's earthquake codes. These factors are based on typical of structure we design to use

[@growstock7944]

can you please provide pushover analysis of RC building in etabs by capacity spectrum method with IS

[@kaushik5439]

Sir, Can a response spectrum data created in MATLAB or excel sheet be inserted into etabs?

[@abhishekshelke4564]

Nicely explained sir thank you

[@arasadamanjaripatnaik5871]

Sir I have analysed a model for response spectrum I have created load cases for response spectrum but while analyzing it is being displayed that loads could not start please give a solution to this problem

[@patilkirankumar1140]

how to take X value

[@sankhadka450]

load assign and load combination are of same as that of static analysis ?

[@manumoudgil9607]

Hello ! Can you please tell me that the results obtained from ETABS analysis( Base shear, Displacements, Drifts) are already amplified or they have to be multiplied with the force modification factors (R in ASCE or Rd-Ro in NBCC)?

[@rafikhan6535]

thank you for wonderful explanation, I have two queries, first is whether I have to run model in set cases only for Response spectrum only?? second is that about how much Response modification factor R value under ubc7 for apartment

[@jeffputra7407]

How to show Tx and Ty in table??

[@Arsuvalzz]

Please how do we design columns and shear walls next to the analysis? And it was a very useful tutorial... God bless you

[@akshaydhumal7380]

Thanks bro 🙏

[@prabh662]

Sir, Kindly tell me if the RS analysis has to be done before defining load combination + envelop And does load combination effects the RS analysis ?? Please Reply ASAP!

[@Arulmozhivarma]

A BIG thanks to you :)

[@raktimbarua6973]

First of all it was a fascinating tutorial. I would like to know when I am going to design for sections do I need to create additional load combinations incorporating Response Spectrum load case? Also this is new for me but based on your experience does response spectrum analysis give better results than static one in high rise buildings or does it make worse (based on it's purpose)?

[@nasratullahamarkhail3217]

Sir, in the video, for re-scaling, why the same value is used for X and Y directions? while the RS base shear is different for both directions, hence we get different scale factors.

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail different scale factors are used ....pls do check the video

[@nasratullahamarkhail3217]

I checked it, 2753.25 (which is calculated considering the X-direction RS base shear) has been used for both X and Y directions...

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail scaling up the min base shear value to 85 %...base shear in other gets increased propotionately

[@beenay18]

@@civilknowhowtutorials7100 can't we put different scale factors in U1 and U2 so that we get 85 percent of static base shear in both x and y direction.

[@nikkorianto2700]

is the I.g/R written in code?

[@nagakishore9223]

sir why did U didn't given the wind load

[@hailaykidanu7301]

sir, why you tries for vertical response spectrum

[@beenay18]

Please make a video tutorial on seismic design of soft story building by modelling the wall as struts and performing dynamic analysis.

[@civilknowhowtutorials7100]

+beenay18 will try if tym allows

[@shivasharana7554]

sir how to find out base shear

[@sabith509]

May i kno what is the load combination for RS Max. Thank You

[@faizahmed4473]

1.2

[@maunikmevada9115]

Sir why scale factor required in rsa??

[@herome3543]

late but thank you for this tutorial.sir, according to Is code we will be using the scale factor of I.g/2R as mentioned in your comment, my question is what will be the re scaling factor according to IS code will it be Ig/2R 0.85 *static base shear/RS spectrum base shear ? your reply will be very much helpful.

[@beenay18]

If I am using Indian Standard, is "I" importance factor? ie I=1 for residential building? Is R response reduction factor? ie R=5 for special moment frame?

[@beenay18]

Is it supposed to work like this for Indian standard: So you put the scale factor as I.g/(2r) at first. And then you run analysis. And then check " (Fx of RSmax)/(Fx of EQx)" and " (Fy of RSmax)/(Fy of EQy)" if one or both of the ratios is less than 0.85 re-enter scale factor as (Ig/2R *0.85 *static base shear/RS base shear) And then run analysis. Then "static base shear/RS base shear" value will be equal to 0.85 for one among fx and fy and that value will be equal to or greater than 0.85 for another among fx and fy. at first i got I.g/(2R)=9806.65/(2*5)=980.665 I entered the value in scale factor and ran analysis. Then I rescaled the scale factor according to above procedure. but I didn't got "static base shear/RS base shear" value equal to 0.85 for one and more than 0.85 for another. both "static base shear/RS spectrum base shear" value were lower than 0.85 for both fx and fy in my case. Does it mean that above procedure does't work for Indian Standard.

[@civilknowhowtutorials7100]

+hero me according to Indian code scale it to total base shesr

[@civilknowhowtutorials7100]

+beenay18 yes

[@sariaosman4267]

many thanks sir ... why the vertical component of earthquake in buildings is not considered

[@civilknowhowtutorials7100]

+Saria Osman bcoz the vertical excitation is negligible n the major effect is due to horizontal ground acceleration..

[@dhirajkalita7505]

Helo sir My Ex is coming 2366.095 and RS =2387.331 at scale factor 40only .units is FPS system .is this value ok or i made any mistake? pls help

[@PraveenKumar-iz2rx]

Sir, could you please teach us about p-delta analysis ??? in etabs

[@keyurtailor8918]

what is the significance of Scale Factor?? What does it indicate?? We are modifying Scale factor, if it is not in limit, what are we exactly doing to structure??What is the limiting ratio of Earthquake Base shear to Response Spectrum Base shear according Indian IS 1893 code???

[@civilknowhowtutorials7100]

+Keyur Tailor The significance of scale factor is to ensure accurate distribution of earthquake forces throughout the building frame members...

[@civilknowhowtutorials7100]

+Keyur Tailor Refer IS 1893 7.8.2 for scaling..

[@civilknowhowtutorials7100]

+Keyur Tailor Use scaling factor as Ig/2R for scaling with Indian code

[@keyurtailor8918]

thank you for your reply. Can you please tell me the unit of gravitational acceleration you have defined in your video tutorial???

[@civilknowhowtutorials7100]

+Keyur Tailor mm/s2

[@nasratullahamarkhail3217]

Is the formula for computing the scale factor ''Ig/R'' taken from ASCE 7-05?

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail it is based on asce asce seismic response coefficient formula...check the csi forum

[@poojah4037]

I think it will be more helpful if you are explained the behaviour of graph obtained after analysing... Which includes what is crt and can be adopted

[@bhupeshpant1935]

Sir how to done response spectrum analysis as per Indian standard

[@markanthonygumamela1014]

hello, do you have a video regarding non-linear static analysis?

[@civilknowhowtutorials7100]

+Mark Anthony Gumamela don't hav one nw...but wil upload soon

[@markanthonygumamela1014]

thank you and I am hoping that you can upload a sample

[@beenay18]

Is non linear static analysis in etabs also called push over analysis? Is non linear analysis is a form of dynamic analysis like Response spectrum and time history analysis?

[@asimjunaidsherwani-]

Dear sir, can you please tell me how can we check our foundation size with the help of this data mean to how can i calculate my footing size by using my etabs model please help me regarding this. and this was really a very helpful video

[@prabhuram14]

Sir please make a video for same response spectrum analysis based on Indian code.

[@maspicard]

Thanks a lot Sir.

[@yogeshbang]

can u pls explain modal mass participation table in all details..till last col. of Sum of Rz, with there min. & max. values required for being safe Structure. Pls explain tortional modes & min. max. values of it, how to remove it. pls upload video for same.

[@Omid_Rayan]

Dear Sir Please upload some videos for shear wall and its optimization. I am concerned about its size and location in the structure.

[@civilknowhowtutorials7100]

+Hamid Nikzad provide 20 mm thick wall...around the lift area..that's it's usual location

[@Omid_Rayan]

Civilknowhow Tutorials Thank you so much for your reply Currently I am doing research on RC frame-shear wall system optimization so I was wondering if you could upload some videos related to shear wall optimization by etabs. I am confused with how to decide the length of the shear wall based on ACI code. thank you so much

[@afzalandthedreams]

@@Omid_RayanAsalamualaikum Mr. Hamid, currently i am pursuing btech could you send me dynamic analysis highrise shearwall building etabs model to my mail so that i could do learn for my project

[@mohammedkhajasalahuddin9873]

how to determine the number of modes for a high rise structure and how to determine number of degrees of freedom for each mode

[@civilknowhowtutorials7100]

+mohammed khaja salahuddin set your model to high number of modes..for eg more than 200...n analyse...analysis wil take quite a tym n while analysis click on show analysis option in the footer....then u wil b able to see no of modes n joints at the beginning of calculation...degrees if freedom will always 2 for spring supports

[@mohammedkhajasalahuddin9873]

OK thank u if I get any queries I will ask u for that can u plz give your email id

[@nasratullahamarkhail3217]

Dear Sir, In my case, I got base shear from RSA more than the linear static base shear....Is it okay or there is something wrong? because normally we expect base shear from RSA to be less than the linear static base shear...Thank you.

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail what's the percentage in in RSA base shear wet to static base shear??

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail what's the percentage in in RSA base shear wet to static base shear??

[@nasratullahamarkhail3217]

I got the point....at first, I didn't divide the scale factor by R. ie. g=386.4 in/s2 was not divided by R=8, where I=1. Now its okay. I got the right RS base shear and scaled it up to get minimum 75% of the Static Base Shear.

[@mohammedkhajasalahuddin9873]

sir I have done time history analysis I have defined the functions and load cases of time history analysis but after the analysis I am getting the time history analysis results as zeros what to do to get the results plz guide me plz help

[@civilknowhowtutorials7100]

+mohammed khaja salahuddin All the results zero lyk moment shear n displacement??

[@mohammedkhajasalahuddin9873]

+Civilknowhow Tutorials yes sir displacement,moments,n shears are zeros what's the problem sir can u plz solve my issue

[@saqadiry5318]

Thank you sir, it is really useful tutorial. it cleared lots of doubts i had regardingly but dont know how to find the number of joints for a concerned project?, as you mentioned: "This project comprises 2833 joints".

[@civilknowhowtutorials7100]

+Sa Qadiry it's from the analysis file..

[@sarannaeemn590]

Can u upload the cad file please ??

[@frsaj7396]

ples. upload single footing design by safe

[@ashmitakoirala3423]

thanku so much

[@spoorthythummala437]

please do give response spetrum analysis as per is code ,sir

[@biniyambirhanu7168]

WOW NICE PRECENTAION

[@gainisagar6773]

Sir please upload some videos on progressive collapse analysis ...pls make a video on interpretation of results of response spectrum analysis

[@born2die688]

Hai sagar

[@born2die688]

R u doing project on progressive collapse analysis

[@born2die688]

Can I have your contact number plz

[@born2die688]

I can help you

[@nasratullahamarkhail3217]

Sir, in case of tall irregular buildings, the moments and shears for design, should they be based on RSA analysis or static linear (ELF) analysis?

[@civilknowhowtutorials7100]

+Nasratullah Amarkhail RSA analysis is btr

[@EngineeringLearningPlatform]

Nice

[@dobocalculus]

thanks !

[@serhangenc]

8:42 and 14:45 have been reserved

[@mimikhaingsoe160]

Sir, Where can i find the scale factor = Ig/R in ASCE code? could you please tell me which chapter of ASCE mention this scale factor? Thanks Sir

[@civilknowhowtutorials7100]

+Mi Mi Khine Soe it's based on seismic coeff calc in asce ...but no direct formula is provided..check the csi forum for the formula

[@VinayAKania]

Dear Sir, Sincere request to send me e mail id for solving my confusion about RS ANALYSIS IN ETABS VK

[@beenay18]

should scale factor in x and y direction be same? can i scale them by different amount so that both of them produce 85 percent of static base shear.

[@sudeepthisuresh1928]

Sir how to get the response spectrum curve on etabs