方钢管混凝土柱的三维非线性分析

3D Nonlinear Analysis for Concrete- filled Rectangular Tube Columns

本文建立了一个三维非线性有限元计算模型，旨在用来准桷、有效地分析钢－混凝土组合结构。其中混凝土材料模型基于亚弹性正交异性理论，采用Ｓａｒｇｉｎ的非线性应力－应变方程表达式以及拉伸、压缩破坏面。钢单元采用等向强化的ＶｏｎＭｉｓｅｓ弹塑性模型，试验和计算比较表明该计算模型是一个比较简单但准确、有效的模型。

A 3D nonlinear F.E.M. computation model is presented in order to analyze thesteel-concrete composite structures. The concrete material model, where Sargin's stress -strain ex-pression and corresponding tension and compreesion failure surfaces are adopted, is based ona hypo-elastic orthotropic approach while Von Mises elasto-plastic isotropic hardening modelis employed for steel element. The comparisons between experimental and analytical resultsshow that the proposed model is a relatively simple but effective one.