BUCKLING ANALYSIS UNDER COMBINED LOADING OF THIN-WALLED PLATE ASSEMBLIES USING BUBBLE FUNCTIONS

摘要

Bubble functions are finite element modes that are zero on the boundary of the element butnonzero at the other point.The present paper adds bubble functions to the ordinary Complex Finite StripMethod(CFSM)to calculate the elastic local buckling stress of plates and plate assemblies.The results indi-cate that the use of bubble functions greatly improves the convergence of the Finite Strip Method(FSM)interms of strip subdivision,and leads to much smaller storage required for the structure stiffness and stabilitymatrices.Numerical examples are given,including plates and plate structures subjected to a combination oflongitudinal and transverse compression,bending and shear.This study illustrates the power of bubble func-tions in solving stability problems of plates and plate structures.