环口板加强带脱空缺陷的钢管混凝土T型节点滞回性能试验研究  

TESTS ON HYSTERETIC PERFORMANCE OF CONCRETE FILLED STEEL TUBULAR T-JOINTS WITH SPHERICAL-CAP GAP REINFORCED BY RING PLATE

作　　者：戴佩家 廖飞宇 王静峰[2] 张伟杰 李艳飞 DAI Pei-jia;LIAO Fei-yu;WANG Jing-feng;ZHANG Wei-jie;LI Yan-fei(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;School of Civil Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)

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

出　　处：《工程力学》2024年第6期105-117,共13页Engineering Mechanics

基　　金：国家自然科学基金项目(51878176)。

摘　　要：为研究环口板加强带脱空缺陷的钢管混凝土T型节点的抗震性能,完成了12根节点试件在主管受恒定轴拉力与支管受轴向往复荷载作用下的滞回试验,基于试件破坏模式、荷载-位移滞回关系和应变发展考察了采用环口板加强带脱空缺陷T型节点试件的效果,并对比分析支主管直径比和主管径厚比对试件加强效果的影响。试验结果表明:采用环口板加强T型节点有效抑制了脱空缺陷导致的主管塑性变形,并实现带缺陷T型节点承载力、刚度、延性和耗能能力的完全恢复,甚至优于相应的无脱空试件,其中加强试件的承载力较带脱空缺陷试件提升12.6%以上,较无脱空试件提升6.5%以上,表明经合理设计的环口板加强措施能够弥补脱空缺陷对节点抗震性能的不利影响。In order to examine the effect of reinforced ring plate on seismic performance of concrete filled steel tubular(CFST)T-joints with spherical-cap gap in CFST chords,a series of hysteresis tests were carried out on 12 CFST T-joints with the chord under constant tensile load and the brace subjected to cyclic axial loading.The performance of CFST T-joints was experimentally investigated in terms of the failure mode,load-displacement hysteresis relationship and strain development.The effects of chord-to-brace diameter ratio and diameter-to-thickness ratio of the CFST chord on the hysteretic behaviour of joint specimens were compared and analyzed.It was found from the test results that the reinforced ring plate could restrain the development of plastic deformation of the CFST chord with spherical-cap gap,and counteract the unfavorable influence on the bearing capacity,stiffness,ductility and energy dissipation capacity of the CFST T-joints caused by the gap.The bearing capacity of the reinforced joint specimen was more than 12.6%higher than that of the specimen with gap but without reinforcement,and it was even more than 6.5%higher than that of the specimen without gap.It was evident that with reasonable design of the reinforced ring plate,the unfavorable influence on the seismic performance of CFST T-joints induced by spherical-cap gap might be fully compensated.

关 键 词：钢管混凝土T型节点 球冠形脱空缺陷 环口板加强 滞回试验 耗能 

分 类 号：TU398.9[建筑科学—结构工程]