Inelastic analysis techniques in seismic evaluations
Abstract
The analytical methods available to the design engineer today are either dynamic time history analyses, or monotonic static nonlinear analyses, or equivalent static analyses with simulated inelastic in- fluences. This paper suggests in addition to the inelastic time history analyses, some simplified analyses techniques based on equating the seismic demand expressed in terms of response spectra with the inelastic capacity described in terms of force-deformation characteristics. The inelastic response in terms of accel- erations and maximum displacements can be evaluated accurately, for a single-degree-of-freedom (s.d.o.f.) system, or approximately for a multi-degrees-of-freedom (m.d.o.f.) system. Such method is similar with the proposed technique for evaluation of response by NEHRP, 1996 to be released in the future codes In an effort to develop design methods based on performance it is clear that the evaluation of the inelastic response is required. The methods avail- able to the design engineer today are either dynamic time history analyses, or monotonic static nonlinear analyses, or equivalent static analyses with simu- lated inelastic influences. Although the inelastic time history analyses (ITHA) are becoming more cost effective, the static monotonic nonlinear analyses (push-over type) provide sufficient insight in the expected behavior for design purposes. The simplified techniques currently available seem to produce rational results, without an apparent theory behind.…
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