Csi bridge vs midas civil8/25/2023 ![]() CSI s oftware calculates rigid stiffness by multiplying the stiffness of a unit volume of concrete by 1e4. Values must be sufficiently large, but not so large as to cause numerical problems or lost accuracy. Uncertainty exists when determining stiffness values which are large enough to simulate rigid behavior. SAP2000 and CSiBridge provide for coupled constraints, though precaution should be taken. This also avoids instability issues which may arise when constraints are coupled. This allows the software to calculate forces which may not be computed when links are bound by truly fixed DOF. The bridge modeler creates rigid restraints and constraints, such as with fixed bearings, by applying large stiffness values to springs and other link objects.
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