Abstract

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Title:: Local Elastic Buckling Analysis of Rectangular Concrete-filled Steel Tube Under Non-uniform Compression

Author(s):: LIU Yong-jian; LI Hui; ZHANG Ning; Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel，Chang’an University

Keywords:: rectangle concrete-filled steel tube; local elastic buckling; Galerkin method; critical buckling coefficient

Abstract:: The buckling modes of rectangular plates under nonuniform compression were described by using different characteristic functions, and the trigonometric series as buckling function to simulate the surface of the unilateral constraints under nonuniform compression load were solved, which rectangular plate buckling mode was asymmetric. The buckling governing equations by Galerkin method were built, then the effect of local elastic buckling under nonuniform load on rectangular concretefilled steel tube (CFST) was analyzed. The results show that the steel tube buckling coefficient increases with nonuniform loading gradient α, uniform bending (α=2) plate under elastic buckling load characteristic value is about 6 times than axial compression. The limit values of widththickness ratio of steel increase with nonuniform loading gradient α. The buckling coefficient of fixed constraint plate with unloaded edges under nonuniform load is greater than that of simply supported plate.