A Spectra-Based Multi Modal Adaptive Pushover Procedure for Seismic Assessment of Buildings

Abstract eng:
Since the conventional pushover analyses are unable to consider the effect of the higher modes and progressive variation in dynamic attribute of structure in inelastic phase, during the recent years, some advanced multi modal and also adaptive pushover procedures have been proposed. However they are not complete and suffer from some drawbacks explained in this paper. In order to remedy these drawbacks, an advanced spectra-based multi modal adaptive (MMA) procedure is proposed. This method incorporates the adaptive method in multi modal pushover analysis while in consecutive steps the effects of the yielding in one mode are reflected in the stiffness matrix of the other modes, whereas the capacity curve and seismic demand are derived for each mode individually. The total seismic demands are estimated by combining the modal demands due to some selected number of modes.

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