不同加载方向异形截面多腔钢管混凝土分叉柱抗震性能试验  

Seismic behavior tests on special-shaped CFT mega bifurcate columns coupled with multiple cavities under different direction horizontal loading

作　　者：武海鹏 曹万林[1] 董宏英[1] 殷飞[1] 李翔宇 WU Haipeng;CAO Wanlin;DONG Hongying;YIN Fei;LI Xiangyu(Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education,Beijing University of Technology, Beijing 100124,China;Postdoctoral Research Station of Mechanics,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京工业大学力学博士后流动站,北京100124

出　　处：《振动与冲击》2018年第18期78-85,120,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51578020)

摘　　要：为研究异形截面多腔钢管混凝土分叉柱不同方向的抗震性能,进行了5个试件在往复两次水平力下的低周反复荷载试验研究。试验考虑了三种加载方向,截面长轴方向、短轴方向和45°方向,两种节点核心区构造,基本构造和节点核心区增加钢管腔体的加强构造。试验结果表明:累积损伤下,焊缝布置位置引导了试件的破坏,各试件的损伤破坏为下柱下水平隔板处焊缝开裂及延伸引起的钢板撕裂;截面长轴方向承载力高、刚度大、变形能力强、耗能能力好,45°方向次之,短轴最弱;节点核心区加强构造可一定程度上提高试件承载力、刚度和耗能能力;同一往复荷载作用下的承载力退化不明显;试件的变形和耗能主要发生在上柱部分,约占60%～70%;各试件均具有良好的弹塑性变形能力,可用于超高层巨型框架结构抗震设计。In order to study the seismic behaviors of special-shaped CFT mega bifurcate columns coupled with multiple cavities in different cross sectional direction,five specimens were tested under a twice repeated horizontal low cyclic load.In the tests,three types of loading directions were considered,including long axial,short axial and 45 degree directions.And there are two types of joint core region constructions including a basic one and an enhanced one by increasing the quantity of steel tube cavities.The test results show that the arrangement of welding seams leads the failure trend under accumulated damage.The failure features appear as steel plate tearing caused by crazing and extending of welding seams at the lower horizontal partitioning steel plate of lower columns.The specimens in long axis possess higher bearing capacity,stiffness,deformability and energy dissipating ability than those in short axis,while the specimens in 45 degree directions take the middle seismic performance.The enhanced construction can increase bearing capacity,stiffness and energy dissipating ability in some degree.The bearing capacity degradation is slight under the same repeated load.The upper columns are the main parts of deformation and energy dissipation,and the proportion is between 60%and 70%.Each specimen possesses good elastic-plastic deformability,and can be used in the seismic design of mega frame structures in super high-rise buildings.

关 键 词：异形截面 多腔钢管混凝土 分叉柱 加载方向 加强构造 

分 类 号：TU398.2[建筑科学—结构工程]