高强方钢管高强混凝土轴压短柱力学性能的有限元分析  

Finite Element Analysis on Mechanical Behavior of the High Strength Concrete-Filled High Strength Square Steel Tube Stub Column Under Axial Compressive Loading

作　　者：李帼昌[1] 闫海龙[1] 陈博文[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第5期847-855,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51378319);辽宁省高等学校创新团队支持计划课题(LT2014012)

摘　　要：目的对混凝土与钢管受力情况及构件破坏过程进行分析,研究其力学性能,以提高构件极限承载力.方法合理选取高强钢材与高强混凝土材料的本构关系,采用有限元分析软件ABAQUS建立了16根高强方钢管高强混凝土轴压短柱有限元分析模型,对混凝土与钢管受力情况及构件破坏过程进行分析.结果高强方钢管高强混凝土轴压短柱受力过程主要分为4个阶段:弹性阶段、弹塑性阶段、下降阶段、平缓阶段.提高钢管的屈服强度,构件的承载力增大,而延性变化不大;提高混凝土抗压强度,构件初始刚度变化不大,承载力增大,延性变差;增大构件含钢率,构件的初始刚度和承载力变大,且延性提高.结论高强方钢管高强混凝土轴压短柱充分利用了高强混凝土抗压与高强钢材抗拉的材性特点,其相互组合作用使构件极限承载力有了显著的提高.In order to improve the ultimate bearing capacity of the steel tube filled with concrete,the stress state and the failure process of the structure were analyzed in this paper. 16 finite element models of high strength square steel tube stub columns filled with high strength concrete subjected to axial compressive load were simulated by the finite element analysis software ABAQUS. Stress states and failure processes of structures were analyzed. It is found that the stress variation process can be divided by 4 stages： the elastic stage,the elastic-plastic stage,the falling stage and the flatstage. With the increase of the yield strength of the steel tube,the bearing capacity of the member increases,but the ductility is not changed significantly; with the increase of the compressive strength of concrete,the bearing capacity of the member also increases,but the ductility is poorer;when the steel ratio of the member increases,the initial stiffness,the ductility and the bearing capacity of the member also increase. Conclusion is that by full use of the compressive property of the high strength concrete and the tensile property of the high strength steel,the ultimate bearing capacity of the mewber can be increased significantly.

关 键 词：高强方钢管 高强混凝土 轴心受压 短柱 有限元分析 

分 类 号：TU398[建筑科学—结构工程]