How can I calculate the shear force affected a composite section (slab on girder composite section) at the support point ... the slab is modeled as shell element and the girder is beam element. is it the Reaction of the support or have another calculation method ?
Thanks in advance
For shears at the ends you can use the support reactions. If you need to find out shears at any location within the span, you would have to calculate that based on the shear in the beam ( usually FY) and the out of plane shear for the plates at that location ( multiply SQX or SQY, depending on the local axis, by the cross sectional area under shear to get the shear force in the plate)
ok. Could U please clarify " the cross sectional area under shear" ... how to calculate / find it ?
Shall I consider the plates of the effective width of the composite section ? or only the plate that is common with the beam member in the same node ?
You should consider the plates that are within the effective width of the composite section.
Good Afternoon Sye,
Hope you are fine : ) ...
Regarding this composite slab on girder bridge model ,. when I used the support reactions values as the shear for the composite section at the ends, it was found to be greater than the summation of the shear force in the beam ( Fy) and the out of plane shear for the plates within the effective width (SQX) .. Could you help me to find the reason of this difference and which is correct shear value acts on the composite section ? A2L-20-4G - Shear.stdA2L-20-4G - Shear - slighty shifted - End girders.std
In other words, are the supports reactions including other forces in addition to the shear of the beam (Fy) and out of plane shear of the plates (SQX) ?
** this difference in values is greater when the loads are near the edge of the bridge (the same edge where the supports are located) between the girders (Supports) ..