平面K型主圆支方钢管节点力学性能数值分析  

NUMERICAL SIMULATION AND EXPERIMENTAL VALIDATION OF MECHANICAL PROPERTIES OF UNSTIFFENED K-JOINTS WITH CIRCULAR CHORD AND SQUARE BRACES

作　　者：陈誉[1,2] 唐菊梅[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021 [2]同济大学土木工程学院,上海200092

出　　处：《工程力学》2011年第8期219-225,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51008133);福建省自然科学基金计划项目(2010J01299);大连理工大学海岸和近海工程国家重点实验室基金项目(LP0705);桥梁结构工程交通行业重点实验室开放基金项目(CQSLBF-Z07-1);泉州市第一批技术研究与开发项目(重点项目)(2009Z48)

摘　　要：以平面K型主圆支方钢管节点的试验数据为基础,建立有限元参数分析模型,进行了非线性有限元参数分析。研究揭示了节点受力全过程,破坏模式以及分布规律。重点考察了支管边长与主管直径比值β、主管的径厚比γ和支管与主管的壁厚比τ对节点极限承载力的影响。有限元参数分析结果表明:主管的径厚比γ和支管与主管的壁厚比τ对节点极限承载力影响较大,而支管边长与主管直径比值β影响较小;γ和τ值均比较小的节点破坏时支管达到杆件极限承载力,说明节点效率大于1,其它几何参数的节点破坏时支管并没有达到杆件极限承载力即节点效率小于1。在国际焊接协会中的平面K型圆钢管节点极限承载力计算公式的基础上,应用多元线性回归方法拟合出平面K型主圆支方钢管节点的承载力计算公式;通过公式本身的回归校验和试验结果以及有限元数据的统计分析,证明该文建立的该类节点极限承载力计算公式具有较高精度。A finite element model simulating the behavior of un-stiffened K-joints with circular chord and square braces was established. Numerical simulation reveals failure process and propagation of plasticity of joints and failure modes. The effect of diameter ratio of branch to chord β, ratio of chord radius to thickness ）,, and thickness ratio of branch to chord τ on ultimate capacity of the joints was also studied. Parametric analysis indicates thatγ , and r have large effect on ultimate capacity of joints compared with β. Joints with small γ and small τ yield completely. Based on the design equation of circular hollow section K-joints by International Institute of Welding, a formula predicting the ultimate capacity of unstiffened K-joints with circular chord and square braces was proposed by applying multivariate regression analysis. Results calculated using the proposed design equations agree well with experimental results and finite element analysis results, so the design equation of unstiffened K-joints with circular chord and square braces was validated.

关 键 词：平面K型主圆支方钢管节点 力学性能 数值分析 极限承载力 计算公式 

分 类 号：TU392.3[建筑科学—结构工程]