2072 Elastic Response Spectrum Analysis ERSA

The ERSA including uniform load method and multimode dynamic analysis method is a linear elastic spectral analysis with the appropriate response spectrum. An adequate number of modes considered to capture a minimum of 90% mass participation shall be used for complex structures.

The uniform load method specified in ATC/MCEER Guidelines [37] is essentially an ESA method that uses a uniform lateral load distribution to approximate the effect of seismic loads. It may be used for both transverse and longitudinal directions if structures satisfy the requirements in Table 20.9.

TABLE 20.9 Recommended LRFD Guidelines — Requirement for Uniform Load Method [37]

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