基于微平面模型的钢管混凝土柱承载力有限元模拟  

Finite Element Simulation of Concrete-Filled Steel Tube Columns Based on Microplane Model

作　　者：董毅[1] 袁勇[1] 

机构地区：[1]同济大学地下工程与建筑系,上海200092

出　　处：《结构工程师》2009年第4期41-47,共7页Structural Engineers

摘　　要：钢管混凝土是在钢管中填充混凝土而形成的一种组合结构材料,该结构中的钢管与混凝土协同工作,优势互补,大幅提高了其极限承载能力,极大改善了构件的延性和塑性性能,故广泛应用于高层建筑、桥梁和地下空间等结构工程领域。在钢管混凝土的有限元模拟中,混凝土的材料模型极大地影响了构件承载力的计算和分析结果。尝试采用混凝土微平面本构模型,运用通用有限元分析软件,编写了混凝土微平面模型的用户材料子程序,分析钢管混凝土构件的受压承载力性能,并在已有试验的基础上进行了比较和分析。Concrete-filled steel tube （CFST） is one type of innovative composite structural materials. Concrete and steel tube in CFST can work interactively and exert their advantages respectively. Profiting from the cooperation between each other, its ductility and plasticity are well improved in addition to the ultimate load capacity. In light of this preponderance, this structural form is applied in a remarkable wide range of practice such as high rise building, bridge and underground structural engineering. In the finite element analysis of the CFST, the selection of the model of concrete material plays a significant role on the results of the strength calculation. In this paper, a new model of microplane theory was adopted in the analysis of this type of concrete steel composite columns. Series of numerical simulations were done by using general FEM software with a user defined material subroutine developed to actualize the microplane model. The verification was also performed by well fitting to the existing experimental data.

关 键 词：钢管混凝土柱 混凝土本构关系 微平面模型 极限承载力 非线性有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]