方钢管超高强混凝土短柱轴压性能数值模拟分析  

Numerical Simulation Analysis of Axial Compression Performance of Ultra-high Strength Concrete-filled Square Steel Tube Short Column

作　　者：周凯凯 李彪[1] 徐鹏[2] ZHOU Kaikai;LI Biao;XU Peng(School of Civil Engineering, Wuhan University, Wuhan, Hubei 430000, China;Renmin University of China , Beijing, 100872, China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430000 [2]中国人民大学,北京100872

出　　处：《水利与建筑工程学报》2018年第2期48-53,共6页Journal of Water Resources and Architectural Engineering

摘　　要：通过有限元软件ABAQUS建立方钢管超高强混凝土短柱轴心受压非线性有限元计算模型,研究了构件受力行为,分析了混凝土强度、含钢率及钢材屈服强度对核心混凝土纵向应力-应变关系以及构件承载力的影响。结果表明:构件均为强度破坏,方钢管超高强混凝土短柱轴心受压全过程主要分为弹性段、弹塑性段、下降段、平稳段四个阶段;混凝土强度及含钢率对核心混凝土纵向应力-应变关系曲线影响较大,钢材屈服强度对其影响不明显;提高混凝土强度、增大含钢率和提高钢材屈服强度均能显著提高构件承载力,但构件延性随混凝土强度增加而降低,钢材屈服强度对构件延性影响不明显。By using finite element analysis software ABAQUS,the nonlinear finite element model of an ultra-high strength concrete-filled square steel tube short column is developed to analyze its mechanical behavior under uniaxial compression.The influence of concrete strength,steel ratio and yield strength of steel on stress-strain relation of the core concrete and bearing capacity of component are analyzed.The results show that the failure of components are all strength failure.The whole process of ultra-high strength concrete filled square steel tube short column under uniaxial compression can be divided into 4 phases including elastic phase,elastic-plastic phase,descending phase and smooth phase.Concrete strength and steel content have great influence on longitudinal stress-strain curve of core concrete,while yield strength of steel have little influence.Improving concrete strength,steel ratio increases and steel yield strength can significantly improve the capacity of component,but the ductility decreased with increasing concrete strength,steel yield strength is not obvious influence on component ductility.

关 键 词：方钢管 超高强混凝土 轴压性能 承载力 

分 类 号：TU398[建筑科学—结构工程]