Design optimization for truss structures under ela

Authors: Tao Liu Ziehen Deng

Publish Date: 2006/09/01

Volume: 19, Issue: 3, Pages: 264-274

PDF Link

Abstract

In this paper a method for the design optimization of elastoplastic truss structures is proposed based on parametric variational principles PVPs The optimization aims to find the minimum weight/volume solution under the constraints of allowable node displacements The design optimization is a formulation of mathematical programming with equilibrium constraints MPECs To overcome the numerical difficulties of the complementary constraints in optimization an iteration process comprising a quadratic programming QP and an updating process is employed as the optimization method Furthermore the elastoplastic buckling of truss members is considered as a constraint in design optimization A combinational optimization strategy is proposed for the displacement constraints and the buckling constraint which comprises the method mentioned above and an optimal criterion Three numerical examples are presented to show the validity of the methods proposedProject supported by the National Natural Sciences Foundation of China Nos 10372084 and 10572119 the Program for New Century Excellent Talents in University No NCET040958 the Open Foundation of State Key Laboratory of Structural Analysis of Industrial Equipment and the Doctorate Foundation of Northwestern Polytechnical University

Keywords: