I am modeling RC arch culvert in STAAD PRO and I am interested in obtaining the shear force and bending moment values. This is a buried structure. I input the lateral earth pressure and vertical load due to backfill as trapezoidal load on the member segments. the support conditions are hinged. when I analyzed the structure and checked the shear force diagram under self weight, I could not be convinced with the output. Shear value was the least at the supports and showed sharp change at each of the nodes. Need Help.
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