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Answer: The bridge force and stress diagrams available through the Bridge Object Response Display menu are based on section cuts that utilize only the objects created by the bridge modeler. Any frame, shell, or solid object manually modified, removed, or added will not be accounted for in section cuts and response diagrams.

Stress calculation

Stresses reported on the "Bridge Object Response Display" form are calculated from forces acting on individual bridge deck section components using beam stress formula which is based on the assumption that plane section remains plane. For example, the top center stress in the slab is calculated from the slab axial force P and moments M3 and M2 as stress = P/A + M3/W33 + M2/W22, where A is the slab area and W22 and W33 are the section moduli of the slab. Similar procedure is used for the calculation of the stresses in the beam.