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Old 14th March 2017, 12:48 PM   #1
Colin Mitchell
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Join Date: Jul 2009
Posts: 33
Default Connection Issue

When 3 or more bolts pairs are specified they are placed vertically in the web, not horizontally.

Am I doing something wrong or is that the intended action?

Same issue with PS7

Regards
Colin Mitchell
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Old 14th March 2017, 04:33 PM   #2
motorphotos
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Join Date: Apr 2011
Posts: 39
Default Re: Connection Issue

Hi Colin

I am sure you know the theory

Putting it basically the moment in the beam at the splice becomes a tension and compression force taken by the plates and the bolts on the top and bottom flanges so if you like these become horizontal shear forces so the plates are checked in tension or compression and the bolts in shear - the forces at a couple with the load x by the distance between so for example a 20 KN.m force on a 200 deep beam gives tension/compression force of 100 kN roughly to be taken by the plates and bolts

the shear force at the splice is taken on the web plates and bolts - this load is vertical so the bolts would be placed vertically either side of the joint ie in the line of the load - if you use 3 bolts then the V is the centres of the bolts with the middle bolt of the three on the centre line of the beam

there is of course a bit more to it but that's basically what happens - we used to hand calc these in the 80's and would not check anywhere near the stuff the program does (flange plate areas 15% more than flange area with a check on net area with the holes for the bolts) shear on bolts and web plates to match beam web

Hope this helps

regards

motorphotos
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Old 15th March 2017, 07:12 AM   #3
Tony Bryer
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Posts: 780
Default Re: Connection Issue

Hi Colin

MP has given you the answer. For flange plate splices the assumption is made that all the bending is taken by the flange plates acting in compression (top) and tension (bottom), with all the shear being taken by the web plates and bolts. This is obviously a simplification of what is actually happening but it is at least easy to follow.
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