Shear Distribution Factor
Shear Distribution Factor
(OP)
I am in the process of rating a bridge and wanted to know the method of computing the shear distribution factor. The AASHTO LFD code says that both shear and moment distribution factors are the same and to compute both from Table 3.23.1, but I have seen in the software manual that the shear distribution factor is computed differently. Could anyone please explain the method for computing the shear distribution factor or any thoughts on this issue.
Joe






RE: Shear Distribution Factor
The article goes on to say that for wheels in other positions on the span (e.g. midspan) the distribution for shear shall be determined by the method prescribed for moment.
This is logical in that near the support, shear displacement will be more influential than the flexural displacement. For example consider a short cantilever subjected to a point load and a long cantilever subjected to the same point load. The percentage contribution of the shear displacement to the short cantilever is likely to be as much as 50% whereas for the long cantilever the shear contribution probably won't reach 0.5%.
Regards,

Qshake
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RE: Shear Distribution Factor