梁翼缘削弱型弱轴连接边框节点抗震性能影响因素分析  

Influencing Factor Analysis on Seismic Performance of I-shaped Column Weak-axis with Reduced Beam Section in Frame Side Joint

作　　者：徐莹璐 卢林枫[1] 李成成 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]洛阳有色金属加工设计研究院,河南洛阳471003

出　　处：《防灾减灾工程学报》2017年第4期656-664,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51278061);长安大学优秀博士学位论文培育资助项目(310828175002)资助

摘　　要：提出了一种新型的节点域箱形加强式工字形柱弱轴连接,基于此节点形式设计梁翼缘削弱型边框架节点足尺试件进行单调荷载试验研究。采用通用有限元软件ABAQUS对此类节点在单调荷载作用下的受力性能进行模拟对比验证后,对此类节点进行低周反复荷载作用下一系列有限元变参数模拟分析,研究各削弱参数对该类节点滞回性能的影响。研究结果表明:梁翼缘削弱型新型弱轴连接节点在低周反复荷载作用下,塑性转动能力达到0.03 rad,塑性铰出现在削弱处,柱子节点域基本处于弹性状态,能较好地满足"强柱弱梁"和"强节点域"的抗震设计理念;不同削弱参数对节点的承载力、刚度、转动能力和延性有一定影响。对新型弱轴连接的削弱参数建议取值:削弱部位距蒙皮板的距离a取值为0.5~0.75倍的梁翼缘宽度,削弱区段长度b取值为0.65~0.85倍的梁截面高度,削弱深度c取值为0.2~0.25倍的梁翼缘宽度。This paper puts forward a new box strengthen-joint region connection for weak axis of I-section column. A full-scale test of frame side joint with reduced beam section under monotonic loading is carried out based on the proposed joint. A general finite element software ABAQUS is used to simulate the mechanical behavior of the joints under monotonic loading, and the simula- tion results are in good agreement with the experimental results. In order to study the effect of various factors on the performance of this kind of joint, a series of parameters analysis under cy- clic loading is employed through finite element method. What the analysis results show are as follows： the maximum plastic rotations are bigger than 0.03 rad; the plastic hinge appears in the reduced beam section, with joint region and I-section column still being in elastic state, which ac- cords with the seismic design principles of ＂strong column and weak beam＂, and ＂strong joint re- gion＂; different weakening parameters have a certain effect on the bearing capacity, stiffness, ro- tation ability and ductility of the joints. For the new weak-axis connections, it is appropriate thatthe distance between skin plate and reduced beam section is about O. 5~0.75 times the width of beam flange, and the length of reduced beam section is about O. beam section, and the cutting depth is about O. 2~0.25 times the 65~0.85 times the height of width of beam flange.

关 键 词：弱轴连接 削弱 边框节点 滞回性能 试验研究 有限元 变参数分析 

分 类 号：TU391[建筑科学—结构工程]