轴向力作用下完全叠接管节点应力集中因子的参数方程  

Parametric Equations on Stress Concentration Factor of Completely Overlapped Tubular Joints under Axial Loading

作　　者：高飞[1,2] 朱宏平[1,2] 龚健[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点实验室,湖北武汉430074

出　　处：《华中科技大学学报（城市科学版）》2009年第1期64-69,共6页Journal of Huazhong University of Science and Technology

基　　金：湖北省自然科学基金(2007ABA308);华中科技大学校科学研究基金(2006Q002B)

摘　　要：通过试验和数值研究推导了完全叠接管节点试件在轴向力作用下应力集中因子的参数方程。首先进行了完全叠接管节点试件在轴向力作用下的实验。采用带有前处理和后处理程序MENTAT的有限元软件MARC对该管节点进行数值模拟,选取8节点厚壳单元建立有限元模型。实验试件与有限元模型在轴向力作用下应变集中因子的平均差值为7.9%,说明有限元模型的计算结果与实验结果吻合。随后通过大量的数值计算研究了完全叠接管节点几何参数与应力集中因子之间的关系。分析结果表明管节点的应力集中因子随着βCT,τTL,ξT和γC的增加而增大,但随着τCT和θ的增加而减小。最后利用非线性回归软件DataF it推导出求解完全叠接管节点应力集中因子的参数方程。通过与实验结果比较,验证了该参数方程满足评估许可准则。This paper presents the parametric equations on stress concentration factor （SCF） of completely overlapped tubular joints under axial loading using experimental and numerical analysis. A specimen of completely overlapped tubular joint is tested first and a finite element （FE） package MARC is used to carry out the numerical study with preand post-processing program MENTAT. 8-node thick shell FE is adopted to simulate the joint. The comparison of SCF between the test specimen and the 8-node thick shell FE agrees well with the average difference of only 7.9%. A comprehensive parametric study is carried out to study the relationship between the geometric parameters of completely overlapped tubular joints and the SCFs. The results showed that the SCFs increase with the increasingβCT,τTL,ξT andγC but decrease with the increasing τCT and θ. A set of parametric equations is derived to predict the SCF of completely overlapped tubular joints using a non-linear regression program DataFit. The parametric equations meet the acceptance criteria of assessment compared with the experimental results.

关 键 词：完全叠接管节点 应力集中因子 轴向力 有限元 参数方程 

分 类 号：TU398[建筑科学—结构工程]