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Rigid Section: This parameter's definition is only used when there are two or more bearings at the same station.Rigid beams are employed to link the bottom nodes of tub girders with bearing locations/supports as seen in the screenshot below. Please refer to the following documentation to understand how to define rigid sections.
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Additional Result Extraction St.: The results of FEComposite elements are generated for stations by default. If additional results are needed at a specific station, this parameter can be used. The FEA will not be affected; only the “Composite Element Forces” and “Composite Element Stresses” are calculated based on the “Additional Result Extraction Station” inputs.