GFRP管夹层灌浆修复锈蚀钢管T形节点有限元分析与承载力计算  

Finite element analysis and bearing capacity calculation of T-shaped joints of corroded steel pipes repaired by grout-filled GFRP tube

作　　者：常鸿飞[1,2] 严晓宇 左文康 宋心怡 刘宁涛 夏军武[1,2] CHANG Hongfei;YAN Xiaoyu;ZUO Wenkang;SONG Xinyi;LIU Ningtao;XIA Junwu(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou 221116,China;State key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [3]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《建筑结构学报》2024年第10期120-130,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51978657);中央高校基本业务费专项(2021ZDPY0209)。

摘　　要：为研究GFRP管夹层灌浆(grout-filled GFRP tube,GFGT)修复锈蚀钢管T形节点的受压性能,建立了锈蚀修复节点的有限元模型,并通过已有试验数据验证了其有效性,据此考察了节点几何构造、修复参数和主管端部应力参数对锈蚀修复节点受压承载力和修复效果的影响规律。参数分析结果表明:GFRP管越厚、修复后主管截面空心率越小、灌浆料强度越高、修复范围越长,GFGT修复效率越高,当支主管直径比为0.4、0.6和0.8,主管锈蚀率为30%时,优化修复参数配置最高可使支管受压承载力提升至未锈蚀状态的138%、147%和156%;主管端部应力对未修复与GFGT修复节点的影响规律一致,且修复后受影响程度更小。采用CIDECT设计指南与规范prEN 1993-1-8:2021中给出的计算方法可准确预测锈蚀受压节点承载力退化率,并通过试验数据验证了采用上述规范公式用于评估节点主管端部应力导致的承载力折减率的可行性,进一步提出了GFGT修复锈蚀圆钢管T形节点的受压承载力计算方法,可用于评估锈蚀率30%以内的修复节点受压承载力。To study the compressive behavior of corroded circular hollow section T-joints repaired by grout-filled GFRP tube(GFGT),finite element models of GFGT repaired corroded joints were established verified,and further employed to investigate the influences of joint geometry,repairing methods and chord end stress ratio on the compressive strength and repairing efficiency.The results demonstrate that the GFCT has higher repairing efficiency with higher thickness of GFRP tube,lower repaired chord section hollow ratio,higher strength of grouting material and longer repair range.Repaired by GFGT,the compressive strength of corroded joints with 30%corrosion rate can be increased to 138%,147%and 156%of the uncorroded counterpart when brace-to-chord diameter ratio is 0.4,0.6 and 0.8,respectively.The chord end stress has a similar but weaker effect on the repaired joints than on the unrepaired joints.The compressive strength degradation rate of corroded joints is precisely predicted by the design methods of CIDECT and prEN 1993-1-8:2021.The feasibility of the standard formula for evaluating the reduction rate of compressive strength caused by the chord end stress is verified.Design methods for predicting the compressive strength of GFGT repaired corroded joints were proposed,which can be used to evaluate the compressive strength of repaired joints with corrosion degree no more than 30%.

关 键 词：圆钢管节点 GFRP管 锈蚀 灌浆 有限元分析 承载力计算 

分 类 号：TU391[建筑科学—结构工程] TU311.41