摘要
模块间钢节点在地震作用下易发生模块单元内梁柱间焊缝撕裂,明显削弱节点的抗震性能。为保护节点中的梁柱焊缝,提出斜撑加强和翼缘加强两种加强方式,考察节点加强后的受力性能。以不同加强方式(斜撑加强、翼缘加强)、螺栓孔型(圆孔、双槽孔)、节点类型(角节点、边节点)和加载方式(单调加载、往复加载)为变化参数,设计了10个足尺加强节点进行单调加载和往复加载试验,获得节点受力变形特征,分析承载力、转动刚度、延性等受力性能指标。建立节点精细化有限元模型,经试验验证后进行参数分析。结果表明:加强节点中模块单元内梁柱焊缝基本未出现焊缝撕裂;主要破坏特征为梁的弯曲变形与局部屈曲、加强件处的焊缝撕裂与翼缘断裂;节点刚度属性分类为半刚性;斜撑加强和翼缘加强方式节点均具有良好的耗能能力,斜撑加强方式节点的承载力和刚度较高,但其延性低于翼缘加强节点的;当螺栓孔设置为槽孔时,基本不影响加强节点的抗震性能,角节点和边节点的转动能力和延性基本一致;往复加载下,斜撑加强节点和翼缘加强节点的转角延性系数较单调加载分别下降约39.2%和53.5%,但仍满足GB 50011—2010《建筑抗震设计规范》中的延性要求。在数值模拟所设置的参数范围内,节点承载性能受斜撑厚度变化的影响较小,但随斜撑焊接距离的增加而提高;而调整加强板长度,可提高节点达到屈服弯矩后的承载性能。
Module-to-module steel connections are susceptible to the module’s beam-column weld tearing under seismic action,significantly weakening the connection’s seismic performance.To protect the beam-column weld,two strengthening methods,diagonal brace and flange strengthening,were proposed to enhance the seismic performance of the connections.To study the effects of different strengthening methods(diagonal brace strengthening,flange strengthening),bolt-hole types(circular bolt hole,dual-slot hole),connection types(corner connection,side connection),and loading methods(monotonic loading,cyclic loading)on the seismic behavior of the connections,ten full-scale connections were tested and the results were discussed in this paper.Moreover,the force-deformation characteristics,bearing capacities,rotational stiffness,ductility,and other seismic performance indexes of the connections were analyzed.An elaborated finite element model was developed and validated by the test results.Then,numerical simulations of key parameters were conducted for comparative analysis.The findings indicate that the beamcolumn welds in the modules of the reinforced connections exhibit negligible instances of weld tearing.The main deformation characteristics of the specimen are bending deformation and local buckling of the beam,weld tearing at the reinforcement and flange fracture.Connection stiffness properties are classified as semi-rigid.Both diagonal brace strengthening and flange strengthening connections exhibit favorable energy dissipation capacity,diagonal brace strengthening connections have higher load-carrying capacity and stiffness,but their ductility is lower than that of flange strengthening connections.The use of slotted holes hardly affects the seismic behavior of the connections.The rotational capacity and ductility of the corner and middle connections are essentially the same.Under cyclic loading,the ductility of diagonal brace and flange strengthening connections decreased by about 39.2%and 53.5%,respectively,compared with that
作者
曹轲
翟思源
王卫永
李国强
CAO Ke;ZHAI Siyuan;WANG Weiyong;LI Guoqiang(School of Management Science and Real Estate,Chongqing University,Chongqing 400044,China;Research Center for Construction Economics and Management,Chongqing University,Chongqing 400045,China;College of Civil Engineering,Chongqing University,Chongqing 400044,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第11期66-79,共14页
Journal of Building Structures
基金
中央高校基本科研业务费(2022CDJSKPT25),国家自然科学基金项目(51808068),国家重点研发计划(2017YFC0703803)。
关键词
模块间节点
节点加强
拟静力试验
数值模拟
受弯性能
抗震性能
inter-module connection
connection strengthening
quasi-static test
numerical simulation
bending behavior
seismic behavior
