可更换波折钢板剪切耗能型柱脚节点的滞回性能分析  

Hysteretic Behavior of Column Base Joints with Replaceable Shear Corrugated Plates

作　　者：窦超 杜彦珂 杨潇 Dou Chao;Du Yanke;Yang Xiao(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]结构风工程与城市风环境北京市重点实验室,北京100044

出　　处：《天津大学学报（自然科学与工程技术版）》2024年第9期935-946,共12页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(52378119);北京市自然科学基金资助项目(8232011).

摘　　要：针对传统钢框架在地震作用下底层柱脚容易产生塑性损伤的问题,为实现震后结构功能的快速恢复,提出一种可更换波折钢板剪切耗能型柱脚节点.采用经试验验证的有限元数值计算方法,建立新型柱脚节点的有限元模型.通过对此柱脚节点进行往复加载分析,研究了其滞回性能、应力发展及塑性损伤分布规律,考察了波折钢板宽高比bc/hc、高厚比hc/tc、波形比Ca/Cl及钢柱轴压比n等参数对节点滞回性能的影响规律,给出了关键参数的选取建议,并基于简化受力模型提出了节点承载力计算公式.研究发现:柱脚节点的滞回曲线较为饱满,表现出良好的耗能能力;在往复加载过程中,塑性变形集中在波折钢板上,其他部件均未发生屈服,震后只需更换受损伤的剪切耗能装置即可实现柱脚节点功能的快速恢复.参数分析表明:波折钢板宽高比bc/hc、高厚比hc/tc对柱脚节点承载力和滞回性能影响较大,在初步设计时建议采用0.5≤bc/hc<1.0、hc/tc≤90的波折钢板,同时需控制钢板提供的极限承载力不超过框架柱的边缘屈服承载力,以保证钢柱不发生屈服;钢柱轴压比的增大会加剧P-Δ效应的影响,使得节点承载力显著下降,因此要合理控制轴压比,建议轴压比取值n≤0.4;波折钢板波形比在合理取值下对节点的滞回性能影响不大,推荐取0.1≤Ca/Cl≤0.2.总之,波折钢板剪切耗能型柱脚节点具有承载力高、耗能能力强、损伤控制等特点,在合理设计下可达到减小结构损伤、实现震后可快速修复的目的.The bottom column base in a conventional steel frame is prone to plastic damage under the action of an earthquake.To achieve the seismic resilience of steel frames,a novel type of column base joint with replaceable shear corrugated plates(CBCP joint)was proposed.By using the verified finite element modeling and analysis,a finite element model of the novel joint was established,and its hysteretic behavior,stress development and plastic damage distribution were studied under cyclic loading.The effects of parameters such as the corrugated plate’s widthto-height ratio bc/hc,height-to-thickness ratio hc/tc and corrugation ratio Ca/Cl as well as the axial compression ratio n of the steel column on the hysteretic behavior of CBCP joint were investigated.The values of key parameters were suggested,and a formula for the joint’s load-carrying capacity was also put forward.It is found that the hysteretic curve of the column base joint is full,showing a satisfying energy dissipation capacity.During the cyclic loading process,plastic deformation occurs mainly on the corrugated plates while other components remain elastic,indicating that the column base joint can be quickly repaired by replacing the damaged corrugated plates after earthquake.The parametric analysis shows that the width-to-height ratio bc/hc and height-to-thickness ratio hc/tc have significant effects on the load-carrying capacity and hysteretic behavior of the column base joint.It is suggested that the corrugated plates with 0.5≤bc/hc<1.0 and hc/tc≤90 should be used in the preliminary design.Meanwhile,the ultimate load-carrying capacity provided by steel plates should not exceed the sectional edge-yielding load of the steel column,so that the steel column will not yield.Increasing the axial compression ratio n of the steel column can aggravate the P-Δeffect and significantly reduce the load-carrying capacity,resulting in the recommended value n≤0.4.Comparatively,the corrugation ratio Ca/Cl has an insignificant effect on the hysteretic behavior of th

关 键 词：功能可恢复 柱脚节点 波折钢板 滞回性能 设计方法 

分 类 号：TU391[建筑科学—结构工程]