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Multiple Bolt Group Analysis

 
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George.Philip
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Joined: 13 Mar 2017
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Location: Abu Dhabi

PostPosted: Tue Feb 13, 2018 6:30 am    Post subject: Multiple Bolt Group Analysis Reply with quote

Dear All,

When we require to support a steel beam to a concrete slab as shown in the attached sketch, how the supports should be considered in the analysis.?
If we are considering the support conditions are fixed, the majority of the loads will be transferred to the first support (BG1 in the sketch a). The next supports will not contribute much in carrying the loads. But if the loads acting on the steel beams are huge, the moment and shear at the fixed support will be very large. The concrete may not bear the stresses due to this large reaction from the single support.

So instead of providing fixed support, Can we consider the supports as spring so as to distribute the loads to both the supports. If we provide spring supports, what all the points we should consider in defining the springs. How we can achieve execute bolt group at the site with properties same as that of the spring parameter.?

Kindly guide me to clear my doubt.

Thanks In Advance,
George



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es_jayakumar
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PostPosted: Tue Feb 13, 2018 10:58 am    Post subject: Reply with quote

Dear Er.George,
First of all, the support system may not behave in the way we want it to behave. That means, if we consider the supports to act as springs, and analyse accordingly, they may not act like that and we cannot compel them to do so either.
Is your beam a cantilever ? I think, the better solution is to provide 4 or 5 pairs of anchor bolts along the support, at equal spacing.

Best wishes,
E S Jayakumar
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Abishek_Siingh
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PostPosted: Tue Feb 13, 2018 12:26 pm    Post subject: Reply with quote

In my limited knowledge, both the supports should be pinned (knife tip support at the first bolt group location from the right). Tension in the bolts will govern.

With Regards,

Abishek
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es_jayakumar
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PostPosted: Tue Feb 13, 2018 2:53 pm    Post subject: Reply with quote

In the present arrangement of bolts in the support, the bolts in the farther group will be under tension, while in the support near the edge, the concrete will be subjected to high compressive stresses.

E S Jayakumar
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George.Philip
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PostPosted: Wed Feb 14, 2018 4:57 am    Post subject: Reply with quote

Thank you the replying Jayakumar Sir and Abishek Sir.


If we are providing 4 or 5 pairs of bolts, then also the same problem will be there right? The first pair will take most of the loads. Or else should we consider single support in the analysis at the mid length?


When we are considering as the first group from the right as pinned support, the forces will be compression in the first group and tension will be in the left one. But in case we have a pulling or pushing force (Fx) in longitudinal direction, then again the first group will absorb most of the shear force and the left bolt group will not contribute. In cases where the first support comes near to the concrete edge, the concrete strength may not be sufficient to take these large shear forces.


Also if we are considering the support as pinned, what all things I need to consider to achieve the moment free support at the site in economical and the easy method?


Regards,
George

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PushkarKokane
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PostPosted: Wed Mar 21, 2018 11:43 am    Post subject: Reply with quote

Respected Sir
Any one have bolt design PDF file with full description as per Indian standards. Joints connection design? I referred Dr B.C Punmia books but in this book not that much design. what is mean M60,10K,8G.
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