Author(s)

R. Almeida & R. Carneiro-Barros

Abstract

A "new" multimode load pattern for pushover analysis: the effect of higher modes of vibration R. ~lmeida' & R. ~arneiro-~arros~ 1 Dept Civil Engng (Applied Mech Div), Instituto Polite'cnico de Braganga 2 ~ e p t Civil Engng (Structural Div), FEUP-University of Porto, Portugal Abstract The effect of the higher modes of vibration on the total nonlinear dynamic response of a structure is a very important and unsolved problem. To simplify the process the static nonlinear pushover analysis was proposed associated with the capacity spectrum method, utilizing a load pattern proportional to the shape of the fundamental mode of vibration of the structure. The results of the pushover analysis, with this load pattern, are very accurate for structures that respond primarily in the fundamental mode. However, when the higher modes of vibration become important for the total response of the structure, this load pattern loses its accuracy. To minimize this problem a "new" multimode load pattern is proposed, ba

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