复杂载荷下管道三通的塑性极限载荷  

PLASTIC LIMIT LOAD OF PRESSURIZED PIPING BRANCH JUNCTIONS UNDER COMBINED LOADINGS

作　　者：轩福贞[1] 李培宁[1] 涂善东[1] 

机构地区：[1]华东理工大学机械工程学院,上海200237

出　　处：《机械强度》2003年第6期646-650,共5页Journal of Mechanical Strength

基　　金：国家"十五"科技攻关项目 (2 0 0 1BA80 3B0 3)~~

摘　　要：目前对于管道三通在内压和弯矩联合作用下的塑性极限载荷累积规律有三种不同的观点 ,即线性方程累积、抛物线方程累积和圆方程累积模式。文中采用非线性有限元方法分析内压与弯矩联合作用下 (包括面内弯矩和面外弯矩两种形式 )管道三通的塑性极限载荷 ,结果表明其累积形式基本上介于抛物线方程和圆方程之间 ,并且与结构几何参量有关。最后在数值分析的基础上提出复杂情况下考虑几何因素的三通塑性极限载荷工程估算式 ,并用试验结果进行验证。For the accumulative rule of plastic limit load of pressurized piping branch junctions subjected to the combined loadings of internal pressure and moments, there are three different points of view, i.e., linear equation, parabolic equation and circular equation. In this work, such issue was investigated systemically by using the non-linear finite element method. According to the numerical results of fifty-four FE models, the accumulative rule of plastic limit load of piping tees with diameter ratio d/D≥0.5, under the combined loadings, is affected by the structural parameters (e.g., ratio of branch pipe diameter and run pipe diameter etc.), and does not conform to the linear equation, but strongly present a nonlinear behaviour such as parabolic equation and circular equation. Consequently, a novel formula that includes the effect of geometrical parameter was proposed to estimate the plastic limit load of tees under the combined loadings. To further verify the proposed formula, six experimental results of plastic limit load under the combined loadings were presented. Overall good agreement between the estimated values and the FE results as well as experimental data provides confidence in the use of the proposed formula in practice.

关 键 词：管道三通 内压 弯矩 塑性极限载荷 有限元分析 

分 类 号：U173.2[交通运输工程] TB115[理学—数学]