RCC Shear wall design for dual system using Etabs tutorial

[@EngineeringLearningPlatform]

Watch "RCC Shear wall design for dual system using Etabs tutorial"

[@saugatthapa1985]

Please tell me how to apply scale factor in column model.

[@EngineeringLearningPlatform]

@@saugatthapa1985 ​ In column model go to load cases as i modified scale factor for drift case in this video, in same manner you can add scale factor for column design model for seismic cases in X and Y directions

[@saugatthapa1985]

@@EngineeringLearningPlatform thank you

[@christianbaldo1227]

Hi sir. Could you also provide a video regarding your insight about nonlinear analysis using etabs?

[@theprobattleknight4185]

Helped me understand concept of design of dual system using etabs

[@farhaankhan5868]

Bro in excel sheet wall resisted 92% of base shear but you didn't apply any scale factor to reduce it to 75% as specified by the code. Why?

[@optimum.structuraldesign]

Helpful video❤

[@czarab22]

Why created Envelop combining all ultimate load cases for stresses, it will be over conservative. better to check for each load case.

[@EngineeringLearningPlatform]

Envelope doesn't add them.

[@engrkamranullahkhan1083]

sir please make video on the use of Scale factors in the Dual frame for both MRF and SHear wall t

[@EngineeringLearningPlatform]

Sure.

[@zainsaeed147]

Whats the formula in excel sheet where the scale factor (i.e. 8.16 & 3.5) is being calculated after noting the percentage of lateral loads taken by columns and shear wall. Secondly this scale factor will be changed for EQ load case only or the EQdrift as well ???

[@EngineeringLearningPlatform]

No we never scale drifts, its just scaling to intentionally transfer more forces to walls and design them for that .

[@zainsaeed147]

@@EngineeringLearningPlatform agree and how about the formula to calculate the scale factors (8.16 & 3.5) in the video

[@sarwarsadiq1393]

Hello Brother, thank you very much for this video where i should change this scale from load cases?

[@EngineeringLearningPlatform]

Yes the load cases

[@sarwarsadiq1393]

@@EngineeringLearningPlatform but will reduce the value of base reaction and its not same as base shear, could you please share the procedure even in text not a video. thank you

[@EngineeringLearningPlatform]

@@sarwarsadiq1393 I don't really get the question

[@sarwarsadiq1393]

@@EngineeringLearningPlatform brother, i was asking if you could provide me a procedure how can i change the scale to achieve 25% of base shear in MRF and 75%in Shear wall

[@EngineeringLearningPlatform]

Simply using 2 models as shown in video

[@hariasssss]

How to apply soil pressure load in basement retaining walls?

[@EngineeringLearningPlatform]

Go to shell loads and apply non uniform one

[@hariasssss]

What is the optimum time period for building.? Is there any limitations to maintain the time period in this range. Becoz if we increase the stiffness the time period reduced considerably

[@EngineeringLearningPlatform]

Roughly time period is 0.1x # of stories but it shall not vary much from 0.02xheight pf building in feet^3/4

[@hariasssss]

@@EngineeringLearningPlatform can you write the formula clearly?

[@EngineeringLearningPlatform]

0.02*total structural height^3/4 Height in feet. And if building is moment resisting then use 0.03 instead of 0.03 and for steel structure use 0.035

[@charlesryanlapinid407]

Great work sir can you make a video also for beam and column design using the scalefactor? may thanks

[@EngineeringLearningPlatform]

Yes its already there . Go to channel and see the playlists named etabs . I have deaigned SMRF IMRF beam, column etc

[@vexelat4361]

@@EngineeringLearningPlatform ma man , awesome

[@mohaiminulhaque9064]

As colm take less than 25% base shear, can we consider it as duel system? If not than shall we revise the value of R?

[@EngineeringLearningPlatform]

No then you can't then you'll have to artificially amplify the force and design the columns for the 25% of the real force

[@mohaiminulhaque9064]

@@EngineeringLearningPlatform If we consider this as a shear wall system instead of dual system and change the value of R accordingly, will it be ok?? And it would be really helpful, if u upload a video showing how amplify load and design com for duel system.

[@christianbaldo1227]

Hi sir, why did you also modify f12? As what CSI have recommended, only f11 and f22 will be modified. Why did you use the modifiers for m11,m22,m12? m11,m22,m12 are for out of plane forces. Generally we don't design the wall for these out of plane forces so CSI suggested that these must be equal to 0.1.

[@EngineeringLearningPlatform]

F12 is the stiffness modifier when forces acts perpendicular to plane and deformation occurs in plane, so it is conservative to do so .

[@christianbaldo1227]

@@EngineeringLearningPlatform when to use shell thin or shell thick

[@EngineeringLearningPlatform]

Shell thick is for foundations as they are rigid .

[@sagurkhan5795]

could you please tell me why we will provide pier level while designing shear wall??

[@EngineeringLearningPlatform]

For the same reason why we assign design strips to slabs

[@sagurkhan5795]

@@EngineeringLearningPlatform thanks a bunch

[@TarikulIslam-tr8de]

The excel file isn't free I see,it requires payment :( And thanks for the informative video, now please make a tutorial based on boundary element method details for shear wall so that a good concept over shear wall design explains totally, please.

[@EngineeringLearningPlatform]

Sure . I think thats a very nominal amount for my efforts :)

[@christianbaldo1227]

Such a bad ass. Great job sir.

[@EngineeringLearningPlatform]

Thankyou

[@hannanshafi2185]

kindly share the rrc frame design for dual syatem

[@EngineeringLearningPlatform]

In sometime

[@neilbantugan]

Sir how will i use the factors 8.16 and 3.5?, do i need to delete The walls in the model for MRF? How will i support the beams connected on the walls then?

[@EngineeringLearningPlatform]

Add these multipliers in load cases .

[@EngineeringLearningPlatform]

No don't deleted anything . Just play with scale factors .

[@neilbantugan]

@@EngineeringLearningPlatform example in my loadcase EQ is 0, i'll change it to 8.16?

[@neilbantugan]

I saw already.. Is it possible to do the same in etabs v9.?

[@EngineeringLearningPlatform]

@@neilbantugan Rarely used that version . Yes it is possible .

[@farhaankhan5868]

Bro we should only modifiy the cracj section modifiers to be 0.35 for only those stories up to which shell stresses are exceeding modulus of rupture and for the remainder 0.7 is used. Here you used 0.35 for all stories. Why?

[@EngineeringLearningPlatform]

Because building is constructed in months and sometimes years and during construction if seismic event arrived then it should design members considering cracked

[@farhaankhan5868]

Bro why didn't you consider the connecting members of both core walls. I think you should have also included coupling beams at each floor level because the coupling action of shear walls is more effective in resisting seismic forces.

[@EngineeringLearningPlatform]

Coupling beam is important in forming the framing system . Yes it has to be incorporated usually .

[@EngineeringLearningPlatform]

But in this structure architecturally we don't have those

[@farhaankhan5868]

@@EngineeringLearningPlatform Considering one core...In lift Wells the door opening is present for lift but the rest of the wall is considered as spanderal and commented to the wall at the other end..In this example you have ignored it

[@EngineeringLearningPlatform]

@@farhaankhan5868 Its not lift pit this large? it is atrium

[@neilbantugan]

Hello sir, what if in the first model my SMRF attracts 150% of the baseshear upon checking the EQ Fx divide by total base shear, resulted..is it possible that it exceeds 100% of baseshear?

[@EngineeringLearningPlatform]

150% of what?

[@neilbantugan]

@@EngineeringLearningPlatform of base shear

[@EngineeringLearningPlatform]

@@neilbantugan 150% of what base shear? i don't get it.

[@neilbantugan]

@@EngineeringLearningPlatform total horizontal reaction..the one you did in scaling

[@EngineeringLearningPlatform]

@@neilbantugan Yes it's based on your R factor if you have changed it .

[@aldiputra9236]

Why Sds Value should be change to be 0.9 ?

[@EngineeringLearningPlatform]

The details of seismic parameters are explained in professional course using ASCE code . Please check link in video description for udemy course