The following example, which demonstrates the implementation of influence-based moving-load analysis, considers a bridge system which will be subjected to a moving load such that a maximum response quantity may be resolved. Influence-based analysis proceeds as follows:
Step 1: Obtain deflected shape
CSI Software first generates lane-load points along and across each lane according to lane discretization. Deflected shapes are then obtained by placing a unit load at each lane-load point along the gravity direction. These unit loads are then transferred from the lane surface to joints within the structural system according to their tributary distribution. The lane-to-object connections which govern this transfer of load path may be reviewed through Display > Show Lanes > Show Structural Connection For Selected Point. If, for example, the model contains 1000 lane-load points, 1000 deflected shapes will be calculated, from which response quantities are determined.
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Computational time for each phase of analysis may vary depending on model parameters, including the number of degrees of freedom, lane-load points, vehicles and axles, response measures, etc. Additional information is available in the CSI Analysis Reference Manual (Computation Considerations, page 467).
See Also
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