铸钢空心球管节点受压极限承载力数值分析  

Numerical analysis of ultimate compressive bearing capacity of cast steel hollow spherical node

作　　者：韩庆华[1] 王开强[1] 刘锡良[1] 张敬宇[2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津理工大学机械工程学院,天津300191

出　　处：《哈尔滨工业大学学报》2006年第8期1270-1272,1277,共4页Journal of Harbin Institute of Technology

基　　金：天津市高等学校科技发展基金资助项目(20031105)

摘　　要：采用四节点轴对称固体单元对受压的铸钢空心球管节点进行了非线性数值分析,通过比较实验结果与数值分析结果确保数值分析的可靠性后,由数值分析结果得出了铸钢空心球管节点受压状态下的应力分布、塑性发展过程以及破坏机理．进而为铸钢空心球管节点构造的优化设计提出了依据和建议并确定了铸钢空心球管节点受压时为弹塑性压曲破坏．在分析铸钢球管节点相关参数对该节点受压极限承载力的影响的情况下,采用以最小二乘法为原理的线性回归模式对铸钢空心球管节点受压承载力公式进行了回归,得出了铸钢空心球管节点的受压承载力公式．Nonlinear FEM numerical analysis of the cast steel hollow spherical node was performed by the axisymmetric solid element with four nodes. Reliability of the numerical analysis was ensured by the comparison of results between the numerical analysis and full size experiment. The distribution of the stress, the process of plasticity spreading and the failure mechanism of the node in compression were obtained. Based on those results the warranties and suggestions about optimum design of the construction of the node were provided. Moreover, plasto - elastic buckling of the cast steel hollow spherical node under axial compressive loading was established. The influences of different parameters to the ultimate compressive bearing capacity were analyzed. Arid the ultimate compressive bearing capacities of 48 different cast steel nodes were calculated by the nonlinear FEM program. According to those results the compressive bearing capacity formula of cast steel hollow spherical node is deduced by the linear regression method depending on least squares theory.

关 键 词：铸钢空心球管节点 受压极限承载力 数值分析 

分 类 号：TU378[建筑科学—结构工程]