八边形中空双钢管混凝土短柱力学性能的非线性分析  

Nonlinear analysis of behaviors of concrete filled double skin steel tubular columns with octagon section subjected to axial loads

作　　者：夏玲涛[1] 徐汉勇[2] 

机构地区：[1]浙江建设职业技术学院,浙江杭州311231 [2]中南大学土建学院,湖南长沙410075

出　　处：《四川建筑科学研究》2012年第4期38-42,共5页Sichuan Building Science

摘　　要：基于八边形中空双钢管混凝土轴压短柱的试验结果,选择了合适的材料本构关系模型与界面处理,采用实体有限元分析方法对此类构件进行了非线性分析。之后,对模拟结果作了详细分析,结果表明,由有限元模型分析得出的荷载-应变关系曲线、内外钢管的破坏形态以及极限承载力与试验结果能较好的吻合。在此基础上,利用该模型在几何尺寸与材料强度等方面进行了扩展,并作了相应的解释。最后,提出了此类构件承载力的计算公式,与试验结果能较好的吻合。With the result of the concrete filled double skin steel tubular columns tests, where the outer tube is octagon section and the inner tube is circular section, and with the rational constitutive model of confined-concrete, a new FEM and the nonlinear analysis is proposed by the FEM. Then,the result of the simulation is analyzed in detail. It is shown that the curves of the load versus strain, the failure model of the outer steel tube and the inner steel tube, and the capacity from the nonlinear analysis are good agreement with the results from the tests. After that,the influence of two factors-size of the section and strength of the sandwich concrete,to the capacity of the member,is analyzed in detail, and some rational suggestion is proposed in this paper. Finally, a formula for calculating the capacity is shown and the calculation results is good agreement with the results from the tests.

关 键 词：八边形 本构模型 非线性 承载力 

分 类 号：TU375.3[建筑科学—结构工程]