复式钢管混凝土柱-钢梁外加强环板节点滞回性能及核心区变形研究  

Hysteretic performance and shear deformation of external ring-stiffened joint between composite CFST column and steel beam

作　　者：张玉芬 宋义敏 朱戈 蒋宗昊 ZHANG Yufen;SONG Yimin;ZHU Ge;JIANG Zonghao(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;School of Civil Engineering,North China University of Technology,Beijing 100084,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]北方工业大学土木工程学院,北京100084

出　　处：《建筑结构学报》2020年第9期154-164,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51478004)。

摘　　要：为了研究复式钢管混凝土外加强环板节点滞回性能及核心区变形场,基于数字散斑方法(DSCM)进行了复式钢管混凝土外加强环板节点低周往复加载试验,对节点的梁柱相对转角变化、核心区受剪性能、节点初始转动刚度以及滞回耗能特性等进行了分析。结果表明:节点弯矩-转角和核心区剪力-剪切变形滞回曲线没有捏拢,呈饱满的梭形,说明节点耗能性能良好;提高环板宽度、锚固腹板加肋和轴压比增大均可提高节点初始转动刚度和节点域抗剪刚度;提高梁柱线刚度比可提高节点的受弯能力、耗能能力和节点域剪切变形能力。节点域剪切变形对复式钢管混凝土柱-钢梁相对转角贡献较大,占比超过30%。测得的核心区剪应变云图分布基本发展为沿对角线对称,后期随着荷载增加,破坏形态为梁端弯曲的试件节点域剪应变发展较缓,而柱端压弯破坏的试件剪应变发展充分,在整个加载过程中,其节点核心区剪应变为梁端弯曲破坏试件的2~3倍。To analyze the hysteretic performance and shear deformation field of external ring-stiffened joints between composite concrete-filled steel tube(CFST)columns and steel beams,the digital speckle correlation method(DSCM)was taken in the low cycle reciprocating loading test of external ring-stiffened joints between composite concrete-filled steel tube(CFST)columns and steel beams.The moment-rotation relationship,shear deformation characteristics of the panel zone,as well as initial rigid classification and seismic energy dissipation were analyzed based on the test data obtained by the DSCM.The hysteresis curves of moment-rotation and shear force-deformation are full and fusiform with no pinching,indicating that the external ring-stiffened joint has a good energy dissipating capacity.The initial rotational stiffness and shear stiffness of joints can be improved by adding stiffening ribs,increasing the axial compression ratio or the ring-stiffened width.The bending capacity,energy dissipation capacity and shear deformation ability can be improved by increasing the linear stiffness ratio between the beams and the columns.The shear deformation of panel zone contributes more than 30%of the relative rotation.Basically the shear strain contours in the panel zone are distributed symmetrically at an angle of 45°.The shear strain of specimens failed with bending failure of the beams developes slowly,while the shear strain of specimens failed with bending failure of the columns developes rapidly.For the latter cases,the shear strain of the panel zone in the whole loading process is two to three times of that of the former cases(i.e.beam failure).

关 键 词：复式钢管混凝土 外加强环板节点 拟静力试验 数字散斑技术 滞回性能 核心区剪应变 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1