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G+2 Building Etabs model

 
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ramu_se
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Joined: 30 Oct 2017
Posts: 60

PostPosted: Mon May 16, 2022 12:16 pm    Post subject: G+2 Building Etabs model Reply with quote

Dear All,

Can you kindly guide me by checking the Etab model.

1. After designing it shows a few columns are overstressed, and I have revised the size and did the design. After that, some other columns are over-stressed.

Initial Column sizes are 9" x 9" , 9" x 12" , 9" x 15". After design i have changed few column properties into 9" x 18".

Kindly check the model and let me know if the initial column sizes are ok or not.

2. Do we need to release the secondary beam moment?

Here I have attached the Auto cad drawing for your reference.



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vikram.jeet
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PostPosted: Tue May 17, 2022 1:58 am    Post subject: Re: G+2 Building Etabs model Reply with quote

Secondary beams be treated as simplysupported on main beams and thus their support moments need to be released.

But more important further to this is sone detailing  aspect of main beams supporting secondary beams. The joint is monolithic and partisl fixity exist. Secondary beam is safe as it is designed for  WL^2/8  mid span moment , as also top bars will take care of partial fixity at support of main beam.

Main beam will be subject to some torsion transfered due to partial fixity for sec beam. This is Compatibility torsion and sd per IS , the minimum shear reinf provided take care of that provided sec beam is designed SS.
But some designers take care of this torsion in form of detailing as under :
(I) Stirrups are decided based on SF ,ignoring Tc bd relief.
(ii) skin reinf bars need to be provided in such main beams

9x18" size seems better for columns


ramu_se wrote:
Dear All,

Can you kindly guide me by checking the Etab model.

1. After designing it shows a few columns are overstressed, and I have revised the size and did the design. After that, some other columns are over-stressed.

Initial Column sizes are 9" x 9" , 9" x 12" , 9" x 15". After design i have changed few column properties into 9" x 18".

Kindly check the model and let me know if the initial column sizes are ok or not.

2. Do we need to release the secondary beam moment?

Here I have attached the Auto cad drawing for your reference.
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