2073Nonlinear Dynamic Analysis

The nonlinear dynamic analysis (NDA) procedure is normally used for the 3% PE in 75-year earthquake. A minimum of three ground motions including two horizontal components and one vertical component shall be used and the maximum actions for those three motions shall be used for design. If more than seven ground motions are used, the design action may be taken as the mean action of ground motions. The result of an NDA should be compared with an ERSA as a check for a reasonableness of the nonlinear model.

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