矩形钢管混凝土横向局压力学性能分析

Mechanical Behavior Analysis of Rectangular Concrete-Filled Steel Tube under Local Transverse Compression

首先简要介绍了国内外已报道的矩形钢管混凝土试件横向局压力学性能的试验结果;然后,在确定了钢材和核心混凝土应力-应变关系模型的基础上,利用有限元软件ABAQUS建立了矩形钢管混凝土横向局压力学性能有限元分析的理论模型;最后,进行了模拟结果与试验结果的比较。结果表明,有限元模型可以很好地模拟横向局压情况下矩形钢管混凝土的钢管屈曲模式、核心混凝土破坏形态及承载力,该理论模型可用于分析横向局压情况下矩形钢管混凝土的工作机理。

This paper presents a study on the mechanical behavior of rectangular concrete-filled steel tube （CFST） under local transverse compression. Firstly,a state-of-the-art review is conducted on the experimental studies on rectangular CFST under transverse local compression. Then the stress-strain relationship of steel tube and concrete core is identified,and a finite element model on rectangular CFST is developed using ABAQUS. Based on the comparison between the results from finite element analysis （FEA） model and tests,the FEA model in this paper can well predict the buckling mode of steel tube,failure pattern of core concrete and bearing capacity of rectangular CFST under local transverse compression. Therefore, this model can be used to analyze the failure mechanism of rectangular CFST under transverse local compression.