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Shear to be resisted by composite steel beam (stud spacing)

Shear to be resisted by composite steel beam (stud spacing)

Shear to be resisted by composite steel beam (stud spacing)

(OP)
Hello,

I am looking at the longitudinal shear to be resisted by a composite steel/concrete beam.

I am following BS 5950-3 and referring to clause 5.6.2 it states that the total longitudinal shear force per unit length, v to be resisted at any point in the span of the beam = NQ/s

where N = number of shear connectors in a group, s is the distance between the centres of the groups of shear connectors (studs) and Q is the shear capacity of a single shear connector.

Going by this if I place the shear connectors further apart - i.e increase the spacing between them the amount of shear required to be resisted by them is actually reduced?

I dont have a great grasp of composite beams - but I would have assumed that if I increased the spacing the shear force to be resisted would increase?

Granted the (longitudinal) shear resistance of the beam is increased if I reduce the spacing - but if the shear force to be resisted also increases - this means that a beam could potentially fail if I reduce the spacing between the shear connectors? Is this right?

If anyone can give me any enlightenment on this subject it would be much appreciated.

- C.
 

RE: Shear to be resisted by composite steel beam (stud spacing)

I think you're comparing apples to oranges...

The longitudinal shear force, v (or q, or whatever you wanna call it), is equal to VQ/I, and that is the force to be transferred by your studs.  You first need to calculate the demand, VQ/I (Q is first moment of area), then find the appropriate number of studs at a given spacing with NQ/s (capacity).  Make sure demand<capacity.  Done.

For whatever reason, this question comes up all the time here.  It should be a FAQ.

RE: Shear to be resisted by composite steel beam (stud spacing)

Here here JK... Totally agree.  I think I might actually expand on and make my post on the built-up timber beam from the other day into a FAQ.

Regards,

YS

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...

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