交叉斜柱转换节点受力性能试验研究  

Experimental research on mechanical behavior of transfer nodes for oblique-cross columns

作　　者：朱颖杰[1] 聂建国[1] 樊健生[1] 

机构地区：[1]清华大学北京市钢与混凝土组合结构工程技术研究中心,北京100084

出　　处：《建筑结构学报》2016年第6期115-122,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51222810)

摘　　要：为研究三柱变两柱交叉斜柱钢结构转换节点的受力性能,对2个相同的转换节点试件进行竖向力和水平力等比例静力加载试验,对节点的承载力、刚度、延性、传力机制进行研究。结果表明:节点在竖向力和平面外水平力作用下承载能力高、延性好,可靠性较高。加载过程中没有出现焊缝开裂的情况,说明腹板数量变化时,使用Y形连接件可避免焊缝过于集中,保证焊接质量。建立相应的有限元分析模型,分析结果表明,水平荷载比例和加载偏心是影响节点变形的主要因素。各竖向板件可协同受力,加载后期细腰附近局部受力由受压力状态转为平面应力状态,水平板件主要承担拉应力。To investigate the behavior of the transfer nodes for the oblique-cross steel columns, an experimental program of two transfer nodes under vertical and lateral monotonic load was conducted. The strength, stiffness, ductility, load transfer mechanism and processability were evaluated based on the results of loading tests. The satisfactory behavior and reliability of the nodes under the axial and lateral load was validated. No weld cracking occurs in the tests, which indicates that the utility of the Y-shaped connections when changing the web numbers guarantees the welding quality by enlarging the distance of welding seams. The FEM analysis shows that the lateral load ratio and the eccentricity are the sensitive factors for the deformation of the nodes. Studies on the load transfer mechanism of the node indicate that the plates of the nodes transfer loads cooperatively, and the stress mechanism near the wrist converts from the pressure field to the plane stress field in the final loading stage, with the horizontal plates mostly in tension.

关 键 词：交叉斜柱 转换节点 静力试验 传力机制 受力性能 

分 类 号：TU391[建筑科学—结构工程] TU317.1