新型带悬臂梁段栓-焊拼接节点力学性能研究  

Study on a New Cantilever Beam Joint with Bolted-Welded Spliced Connections

作　　者：焦燏烽 何敏娟[2] 马人乐[2] 

机构地区：[1]河南科技大学土木工程学院,河南洛阳471023 [2]同济大学土木工程学院,上海200092

出　　处：《建筑钢结构进展》2015年第4期10-18,共9页Progress in Steel Building Structures

基　　金：国家自然科学基金(51378382)

摘　　要：以提出的新型带悬臂梁段栓-焊拼接节点的试验数据为基础,从节点极限承载力、破坏模式、各部件应力分布及塑性区扩展等方面进行非线性有限元模型校验,基于校验后的模型研究了几何、材料及荷载等参数对节点初始刚度及极限弯矩的影响,并提出了节点设计方法。有限元分析结果表明,单向荷载作用下,法兰板的厚度对节点初始刚度的影响较大,当板厚大于20mm时,节点初始刚度和极限承载力显著增加;往复荷载作用下,连接法兰板的螺栓孔周围出现了明显的应力集中现象,随着荷载的增大,高强度螺栓由摩擦型转为承压型;该类型节点力学性能良好,符合工业化装配式钢结构体系设计要求。This paper presents a finite element model for simulating the behavior of a new cantilever beam joint with bolte-welded spliced connections. The model is validated by comparing the numerical results with experimental data on ultimate capacity, failure mode, stress distribution and plasticity propagation. Using this model, the effects of geometry, material, and loading on the initial stiffness and ultimate moment of the joint are discussed. The results of parametric studies indicate the thickness of flange has a great impact on initial stiffness of the joint. Under monotonic loading, the ultimate capacity and initial stiffness increase dramatically when flange thickness is larger than 20mm. While under cyclic load, stress concentration is created in the zone near the bolt opening on the flange. The high-strength bolts of flanges are converted from friction-type into bearing type with the increase of loading. This study indicates the proposed new joint exhibits better mechanical behavior, and thus can satisfy the requirement of industrial prefabricated steel structures.

关 键 词：栓-焊拼接节点 非线性有限元模型 接触分析 参数分析 初始刚度 

分 类 号：TU391[建筑科学—结构工程] TU317.1