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RC beam shear links without bottom leg

 
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niresh28
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Joined: 03 Aug 2018
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PostPosted: Wed Dec 26, 2018 4:15 am    Post subject: RC beam shear links without bottom leg Reply with quote

Dear Sefians,
I have a beam of depth 600mm which the bottom 100mm was hacked and recast to achieve 500mm depth.

The main rebars were cut and replanted to the column supports at a higher position.

The shear links however, the bottom loop was cut and was not reinstated. So now the links are in an invert 'U' shape (bottom main bars not looped by links). Kindly see attached beam section.

Will the beam still be effective in shear? Your valuable input would be highly appreciated.

Thank you very much
Niresh.



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mjnasar
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Joined: 26 Jan 2003
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PostPosted: Wed Dec 26, 2018 6:44 am    Post subject: Reply with quote

Yes, As per AcI -314M14

Vs = Av *fyt * d

only Av*d of shear stirrups resists the Shear
and the reinforcement along the breadth only extended for development requirements

hope it will be useful for you.

regards



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niresh28
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Joined: 03 Aug 2018
Posts: 16

PostPosted: Wed Dec 26, 2018 10:31 am    Post subject: Reply with quote

mjnasar wrote:
Yes, As per AcI -314M14

Vs = Av *fyt * d

only Av*d of shear stirrups resists the Shear
and the reinforcement along the breadth only extended for development requirements

hope it will be useful for you.

regards



Thank you so much mjnasar. Your input has been very helpful. I will study the above and the related codes.

Thank you very much.
Niresh
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abhio
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Joined: 08 Mar 2010
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PostPosted: Mon Dec 31, 2018 12:55 pm    Post subject: Dangerously wrong practice. Reply with quote

Dear Er Niresh,

Without the bottom run, the shear links won't be able to develop full stress, and will be ineffective. Also, bottom bars won't be able to develop dowel action. The concept of leaving stirrups without anchorage is dangerously wrong and a disaster waiting to happen.

Hope seniors on this forum could see this post.
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niresh28
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Joined: 03 Aug 2018
Posts: 16

PostPosted: Wed Jan 02, 2019 10:30 am    Post subject: Re: Dangerously wrong practice. Reply with quote

abhio wrote:
Dear Er Niresh,

Without the bottom run, the shear links won't be able to develop full stress, and will be ineffective. Also, bottom bars won't be able to develop dowel action. The concept of leaving stirrups without anchorage is dangerously wrong and a disaster waiting to happen.

Hope seniors on this forum could see this post.




Dear Abhio,
Thank you for your valuable input. I would like to provide an update. We found out at site that there are excess length of link sufficient to wrap around the bottom rebar across the width of beam. We have also welded the locations where the link free ends lap each other.

Thank you very much.
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