Dual System requirement of buildings with SMRF and Shear walls in ETABS

An important check for satisfying the duality of systems is to ensure that Moment resisting frames are designed to resist independently at least 25 percent of the design base shear.

[@deveshjaiswal3388]

Very well explained, Thanks for this. This is very useful for my Project work.

[@CivilPoint]

Thanks Sanjay. It was very useful for me.

[@engr.md.titumirhasan5595]

thanks a lot dear, but make another videos with others methods/procedure to satisfy the condition. please. thanks.

[@subhajitmukhopadhyay4780]

Is it allowed to keep the thickness less than 150 mm as per IS 13920 - 2016 ? Please clarify.

[@user-kn7pu1bz1f]

Code doesn't say you proportion stiffness such that 75% of the base share is taken by shear wall and 25% by MRF but it says MRF should be designed such that it is capable of resisting 25% of Base Shea. In reality the base shear taken by frames could be less but they must be designed for 25%.

[@ANKITSAINI-73]

Hlw sir how to contact you?
I have a problem using shear wall in etabs as in my results base shear increase with using shear wall in bare frame.
Plz help

[@dennisbuena9752]

is this based on ACI?

[@structurelearninghub3340]

What if column doesnt contribute by 25% of total base shear. How to give minimum 25% base shear to column in that case

[@sanjaykumawat8734]

If we make sure that 75% of the base shear is taken up by the shear walls independently then the remaining will be obviously taken by the moment-resisting frames.

[@structurelearninghub3340]

@@sanjaykumawat8734 thank you for a reply but we may also face a case where shear wall may take more than 75 % base shear than In that case column will take less than 25% base shear..In this case; How can we provide minimum 25% base shear to columb

[@sanjaykumawat8734]

@@structurelearninghub3340 I have explained an iterative method by varying the thickness of the shear wall to satisfy this condition in this video above...pls look at it once

[@structurelearninghub3340]

@@sanjaykumawat8734 can Scale up the factor for load cases EQX and EQY to meet minimum 25% base shear for column design only with separate model

[@sanjeeblibi644]

@@sanjaykumawat8734 How can we say that the remaining 25% base shear will taken by column. In this video no calculation for column base shear as like for shear wall is calculated. If from column calculation takes less than 25% then what?

[@rajeshkannas90]

How satisfy the flat slab in seismic building, shear wall - 100%,outer peripheral wall -25%

[@hamzehqublan8535]

With all respect sir
This is completely wrong

[@rafiktaleb1504]

Sorry to say that this is not the right method to satisfy this requirement. Satisfying this requirement needs to analyze a second model with frames only, by removing the shear walls, under 25% lateral load and then compares, frame by frame, the story shear forces to those taken by the frame in the initial model.
Please refer to section 7.4.1 of the FEMA P-751(2012) for a detailed example of how to satisfy this requirement (link below)
www.wbdg.org/ffc/dhs/criteria/fema-p-750

[@sanjaykumawat8734]

Yes, I know it is not an exact method, but I was just interested in knowing what flaws this method could have...If you can please share your views on this....I just figured out this method during my coursework and found it to be reasonable...Thankyou.

[@GaneshKumar-vi8lo]

75% base shear for wall is not seen in Indian standard.......