单边螺栓连接中心支撑钢框架抗震性能分析  

Seismic performance analysis of centrally braced steel frame with one-side bolt connection

作　　者：蔺新艳[1] 杨新宇 王新武[2] 孙海粟[2] 刘欢欢 JANG Il Young LIN Xinyan;YANG Xinyu;WANG Xinwu;XUN Haisu;LIU Huanhuan;JANG Il Young(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Henan International Joint Laboratory of New Civil Engineering Structure,Luoyang Institute of Science and Technology,Luoyang 471023,Henan,China;School of Science,Wuhan University of Technology,Wuhan 430070,China;College of Civil Engineering,Kumoh NationalInstitute of Technology,Gumi-si 39177,South Korea)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]洛阳理工学院河南省新型土木工程结构国际联合实验室,河南洛阳471023 [3]武汉理工大学理学院,湖北武汉430070 [4]金乌国立工科大学土木工程学院,韩国龟尾39177

出　　处：《河南理工大学学报（自然科学版）》2024年第2期166-176,共11页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51278238,51678284);中原科技创新领军人才项目(214200510002);河南省高校科技创新团队项目(21IRTSTHN010);河南省科技攻关项目(212102310969)。

摘　　要：目的为研究支撑-半刚接钢框架结构体系的抗震性能,方法设计了一榀由嵌套式单边螺栓与T型钢构成的半刚性梁柱节点的中心支撑钢框架,并进行了拟静力试验与有限元数值模拟,通过观测整个试验现象,分析了其滞回、承载力、刚度退化、耗能等抗震指标。结果结果表明:试件破坏过程明显经历了弹性段、塑性段、破坏段三个阶段,试件破坏模式主要为支撑受压失稳破坏,塑性变形主要累积在支撑体系上,整体呈现延性破坏特征;支撑断裂后,梁柱及T型钢节点无明显塑性变形,钢框架仍具有较高的安全储备,符合“强节点、弱构件”设计原则,表明了结构具有两道抗震防线;结论支撑与半刚接钢框架协同工作使得试件具有较高的抗侧刚度抵抗水平变形,且承载力较高、滞回性能稳定、耗能能力优良;单边螺栓在试验过程中的受力性能较普通高强螺栓并无较大差别,未出现严重的预紧力松弛现象,并能高效的保持螺栓预紧力。通过有限元数值模拟分析可知,减小支撑长细比,虽能有效提高结构的抗震性能,但长细比较小会导致支撑刚度增大,加速其余构件的损坏。故应以考虑结构的延性为前提,降低支撑的长细比,才能有效提高结构的抗震性能。Objectives In order to study the seismic performance of braced and semi-rigid steel frame structure system,Methods a center-braced steel frame with semi-rigid beam-column joints composed of nested one-side bolts and T-stub was designed,and the quasi-static test and finite element numerical simulation were carried out.By observing the entire experimental phenomenon,the seismic indicators such as hyster⁃esis,bearing capacity,stiffness degradation,and energy dissipation were analyzed.Results The results show that the failure process of the specimen has gone through three stages:elastic section,plastic sec⁃tion,and failure section,the failure mode of the specimen is mainly the buckling failure of the brace un⁃der compression,and the plastic deformation mainly accumulates on the brace system,presenting the char⁃acteristics of ductile failure as a whole.After the brace breaks,there is no obvious plastic deformation in beam-column and T-shaped steel joints,and the steel frame still has a high safety reserve,which conforms to the design principle of“strong joints and weak members.”It indicates that the structure has two lines of seismic resistance.Conclusions The cooperative work of brace and semi-rigid steel frame makes the speci⁃men have high lateral stiffness,horizontal deformation resistance,high bearing capacity,stable hysteretic performance and excellent energy dissipation capacity;During the test,the mechanical performance of the one-side bolts are not significantly different from that of the ordinary high-strength bolt,and there is no se⁃rious relaxation of the preload,and it can effectively maintain the bolt preload.Through finite element nu⁃merical analysis,it is known that reducing the slenderness ratio of the brace can effectively improve the seismic performance of the structure,but a small slenderness ratio can lead to an increase in the stiffness of the brace and accelerate the damage of other components.Therefore,in order to effectively improve the seismic performance of the structure,it

关 键 词：中心支撑 单边螺栓 T型钢 半刚性连接 抗震性能 

分 类 号：TU391[建筑科学—结构工程]