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This article is primarily written for CSiBridge, but a similar approach also applies to SAP2000.


Though influence-based moving-load analysis is a linear application, nonlinear step-by-step moving-load analysis may be performed by applying the Vehicle Live load pattern (or Bridge Live load pattern in SAP2000) in the Nonlinear Time-History load case.

This is accomplished through the process which follows:

  1. Define a load pattern of Vehicle Live type (or Bridge Live type in SAP2000). To avoid dynamic effects, use a minimal vehicle speed.

  2. Change the automatically created Multi-Step static load case to a Time-History load case. Select the Nonlinear, Direct-Integration analysis type, then define damping and other parameters as necessary.

  3. Run the analysis. When plotting results, choose the Envelope option.

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