Shape and topology optimization of truss structures under non-stationary stochastic seismic excitations
LI Xueping,LI Donghong,WEI Peng,SU Cheng
State Key Laboratory of Subtropical Building Science,School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China
Abstract:Aiming at the dynamic optimization problems of truss structures under non stationary random seismic actions,the sensitivities of non stationary random responses of a truss structure to design parameters were derived based on the time-domain explicit method.The cross-section areas and nodal coordinates of the truss structure were optimized combined with the method of moving asymptotes.The volume of the truss was taken as the objective function and the displacement variances under actions of horizontal and vertical earthquakes were taken as the constraints to establish an optimization model.Two numerical examples illustrated the feasibility and effectiveness of the proposed method for dynamic shape and topology optimization of truss structures under non-stationary stochastic seismic excitations.
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