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Shear design in a beam using results of staad.pro

 
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Ranjan_Parajuli
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Joined: 17 May 2013
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PostPosted: Fri Jul 19, 2013 6:02 am    Post subject: Shear design in a beam using results of staad.pro Reply with quote

Hi everyone,

Through the output of a beam forces in staad.pro, I have obtained shear forces for envelope case. The shear forces in the result has got both positive and negative value for the same point. I am a bit confused about which flexural reinforcement percentage need to be used in calculating the shear strength due to concrete as per IS 456 as I have calculated flexural reinforcement for both top and bottom side. Moreover, I would also like to know if the maximum shear value among these irrespective of sign is to be used in obtaining shear stress.

Is it like the positive value of shear should correspond to tension reinforcement(bottom side)? I am not clear with the concept on this. Please somebody enlighten me.

Waiting for quick response.

Ranjan Parajuli
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sknsrinivasan
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Joined: 15 Apr 2013
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PostPosted: Fri Jul 19, 2013 6:41 am    Post subject: Reply with quote

Dear Ranjan

In STTAD all Positive moment will rotate counter clockwise and Negative moment will rotate Anticlockwise, so positive value will be top and negative value will be bottom. At the time of shear design consider shear force near support, If bottom shear is high consider bottom value or if top shear is high consider top value

Percentage of tension reinforcement  where you have given high reinforcement either top or bottom at support  consider That Percentage

Thanks
N.Srinivasan
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sknsrinivasan
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PostPosted: Fri Jul 19, 2013 7:04 am    Post subject: Reply with quote

Small correction in my perivious post Nagative moment will rotate clockwise insted of anticlockwise The software will consider Fixed end moments (+ve,-ve,+ve,-ve etc)
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Ranjan_Parajuli
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PostPosted: Fri Jul 19, 2013 10:08 am    Post subject: Reply with quote

sknsrinivasan wrote:
Small correction in my perivious post Nagative moment will rotate clockwise insted of anticlockwise The software will consider Fixed end moments (+ve,-ve,+ve,-ve etc)



Thank you for your response.
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