一般大气环境下锈蚀H型钢梁柱焊接节点抗震性能试验  

Experimental study on seismic performance of H-section beam-column welded connections corroded in general atmosphere

作　　者：王友德[1] 史涛 马蕊[1,2] 徐善华 WANG Youde;SHI Tao;MA Rui;XU Shanhua(Department of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;First Affiliated Hospital of Xi’an Jiaotong University,Xi’an 710061,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安交通大学第一附属医院,陕西西安710061

出　　处：《建筑结构学报》2022年第7期184-193,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51908455);中国博士后科学基金项目(2019M653572);陕西省重点研发计划项目(2022SF-473)。

摘　　要：为研究一般大气环境锈蚀对梁柱焊接节点抗震性能的影响,对6根H型钢焊接梁柱节点试件进行了户外周期喷淋加速腐蚀试验与低周往复荷载试验,研究不同锈蚀率对焊接梁柱节点损伤过程、破坏模式、滞回曲线、骨架曲线、承载力、变形能力、刚度及耗能能力的影响,得到了其承载力、延性及耗能能力随锈蚀率增大的退化规律。研究结果表明:一般大气环境下节点呈现出全面锈蚀特征,且不同位置的锈蚀量存在差别,梁下翼缘的锈蚀量最大,梁腹板、柱翼缘和柱腹板的锈蚀量次之,梁上翼缘的锈蚀量最小;锈蚀对梁柱焊接节点失效模式具有重要影响,锈蚀率为5.03%~8.85%的节点梁根部发生严重局部屈曲,产生了明显的承载力退化现象,破坏特征由突然破坏向混合破坏转变,且锈蚀导致断裂临界裂缝萌生位置上移及扩展路径改变;锈蚀节点屈服荷载、峰值荷载、峰值位移和位移延性系数均呈线性退化规律,并产生初始刚度损伤,破坏时塑性循环加载次数较未锈蚀节点降低2~4次,累积耗能呈幂函数降低趋势,锈蚀率为5.03%~8.85%节点梁端总转角不能满足总转角5%的抗震设计要求。Six H-section steel beam-column welded connections were subjected to the periodic outdoor spray accelerated corrosion test and low-cycle loading test to study the influence of atmospheric corrosion on the seismic performance of beam-column welded connections.The damage process,failure mode,hysteretic curve,skeleton curve,bearing capacity,deformation capacity,stiffness and energy dissipation capacity of the welded beam-column connections with different corrosion degrees were studied,and their degradation laws with the increasing corrosion ratio were revealed.The results indicate that the beam-column connections show general corrosion characteristics under a general atmospheric environment,and there are differences in the corrosion loss at different positions.The amount of corrosion from most to least is beam lower flange,beam web(column flange,column web),beam upper flange.Corrosion has an important influence on the failure mode of beam-column welded connections.Severe local buckling at the beam root was observed for the beam-column connections with the corrosion ratio of 5.03%-8.85%,resulting in obvious bearing capacity degradation,and the failure characteristics changed from sudden failure to mixed failure.Meanwhile,corrosion causes the critical crack initiation position to move up and the crack propagation path to change.The yield load,peak load,peak displacement and ductility coefficient of the corroded beam-column connections all show linear degradation laws and produce initial stiffness damage.The number of plastic cyclic loading during the failure is reduced by two to four times,resulting in the energy dissipation to decrease in a power function.The total rotation angle at the beam end of the beam-column connections with the corrosion ratio of 5.03%-8.85%cannot meet the requirement of 5%in the seismic design.

关 键 词：梁柱焊接节点 锈蚀 一般大气环境 拟静力试验 抗震性能 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1