带球冠形脱空缺陷的钢管混凝土拉弯构件滞回性能试验研究  

EXPERIMENTAL RESEARCH ON HYSTERETIC BEHAVIOR OF CONCRETE-FILLED STEEL TUBULAR MEMBERS WITH SPHERICAL-CAP GAP UNDER BENDING AND TENSION COMBINED LOADING

作　　者：张伟杰 廖飞宇 王静峰[2] 袁虹波 ZHANG Weijie;LIAO Feiyu;WANG Jingfeng;YUAN Hongbo(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]福建农林大学交通与土木工程学院,福州350002 [2]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《工业建筑》2019年第10期32-36,共5页Industrial Construction

基　　金：国家自然科学基金项目(51578154);福建省科技厅高校产学研合作项目(2018H6005);福建农林大学国际合作项目(KXGH17009)

摘　　要：以脱空率和轴拉比为主要参数,对4根带球冠形脱空缺陷及2根无脱空的钢管混凝土试件进行了滞回性能试验研究,考察了球冠形脱空缺陷对钢管混凝土拉弯试件的破坏模式、侧向荷载-位移滞回曲线、以及承载力的影响,分析了不同脱空率和轴拉比对带缺陷试件的滞回性能影响规律。试验结果表明:球冠形脱空缺陷对钢管混凝土拉弯构件的侧向荷载-位移滞回曲线及骨架线影响较小,但加剧了夹具两侧外钢管的屈曲,并使核心混凝土在跨中部位的裂缝更加密集;试件的承载力随着脱空率的增大而降低;轴拉比对无脱空试件承载力影响不明显,而球冠形脱空缺陷试件承载力随轴拉比的增大而降低。Based on the main parameters of gap ratio and axial tension ration,the hysteretic behavior of six concrete-filled steel tubular(CFST)members was tested under constant axial tension load and cyclical bending.The tests included 4 CFST specimens with spherical-cap gap and 2 specimens without gap.The effects of spherical-cap gap on the failure modes,transverse load-displacement hysteresis curves and bearing capacity of specimens were investigated.The effects of gap ratio and axial tension ratio on hysterectic behavior of specimens with defects were analyzed.The test results showed that spherical-cap gap has a small effect on the shape of transverse load-displacement hysteresis curves and sheleton curves of specimens,but the spherical-cap gap exacerbated the degree of buckling of the outer steel tubes and made more cracks in the mid-span of core comcrete column;the transverse bearing capacity of the specimen decreased with the increase of the gap ratio,and the influence axial tension ratio on the transverse bearing capacity of specimen without gap was not obvious,but for the specimen with spherical-cap gap,the increase in axial tension ratio significantly reduced the transverse bearing capacity.

关 键 词：钢管混凝土 球冠形脱空缺陷 拉弯 滞回性能 试验研究 

分 类 号：U41[交通运输工程—道路与铁道工程]