GFRP管约束钢管混凝土加劲混合柱轴压力学性能试验研究  

Experimental study on mechanical properties of axially loaded GFRP tubed confined concrete-encased CFST columns

作　　者：李双蓓[1,2] 潘星年 陈宇良[3] 秦康 LI Shuangbei;PAN Xingnian;CHEN Yuliang;QIN Kang(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Construction Engineering Railway Prefabricated Construction Industry Co.,Ltd.,Liuzhou 545006,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西科技大学土木建筑工程学院,广西柳州545006 [4]广西建工轨道装配式建筑产业有限公司,广西柳州545006

出　　处：《混凝土》2022年第5期31-36,共6页Concrete

基　　金：国家自然科学基金项目(51878186,51738004,51868006)。

摘　　要：为改善钢管混凝土加劲混合构件因外围钢筋混凝土与核心钢管混凝土的性能差异较大,无法协同工作至破坏的缺点,提出了一种新型组合构件:GFRP管约束钢管混凝土加劲混合柱(FCECFST),将其与普通钢管混凝土加劲混合柱(CECFST)、钢管混凝土柱、GFRP管约束钢筋混凝土柱进行轴压试验对比,分析4种不同组合构件的力学性能和破坏形式。结果表明:在GFRP管约束下,FCECFST承载力比CECFST提高9.6%,延性系数提高295.5%;加载后期GFRP管有效限制了钢筋混凝土和钢管混凝土的横向变形,试件承载力出现二次强化,荷载可以达到第二次峰值,构件各部分能够协同工作至破坏。In order to improve the failure of concrete-encased concrete-filled steel tubular member(CECFST)due to the great difference between the external reinforced concrete and the core concrete filled steel tube,a new type composite member is proposed,namely,GFRP tubed confined concrete-encased CFST columns(FCECFST),and it is compared with CECFST,concrete filled steel tube columns and GFRP tubed confined reinforced concrete columns by axial compression test,and the mechanical properties and failure modes of four different composite components are analyzed.The results show that the bearing capacity and ductility coefficient of FCECFST are 9.6% and 295.5%higher than those of CECFST under the constraint of GFRP tube.At the late loading stage,GFRP tubes effectively limit the transverse deformation of RC and CFST,the bearing capacity of the specimen is strengthened twice,the load can reach the second peak value,and all parts of the component can work together until failure.

关 键 词：钢管混凝土加劲混合构件 GFRP 轴压性能 延性 承载力 

分 类 号：TU528.571[建筑科学—建筑技术科学]