GFRP管-灌浆料修复锈蚀钢管节点受压性能研究  

COMPRESSIVE PERFORMANCE STUDY OF GROUT-FILLED GFRP TUBE REPAIRING CORRODED JOINTS

作　　者：常鸿飞[1,2] 高宇航 左文康 李照伟 严晓宇 CHANG Hong-fei;GAO Yu-hang;ZUO Wen-kang;LI Zhao-wei;YAN Xiao-yu(JiangSu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 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：《工程力学》2023年第2期145-156,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(51408596,51978657);中央高校基本业务费项目(2021ZDPY0209);徐州市重点研发计划项目(KC19199)。

摘　　要：圆钢管焊接节点应用广泛,长期服役后的腐蚀退化问题严重影响其安全性和剩余寿命。为研究GFRP管-灌浆料修复锈蚀钢管节点的效果,对6组未锈蚀、锈蚀未修复和GFRP管-灌浆料修复的锈蚀圆钢管T形节点开展了支管轴压力静载试验。试验结果表明:主管锈蚀导致的约10%重量损失会使节点承载力降低近20%;GFRP管-灌浆料有效地约束了锈蚀主管的侧向外凸变形,使节点的控制破坏模式由主管塑性化转变为主管冲剪,从而使锈蚀节点的受压承载力和初始刚度分别提升约100%和50%,且均高于未锈蚀的对比试件。基于验证的精细化有限元模型,进一步参数分析表明,支主管直径比、GFRP管厚度以及修复主管截面空心率是影响修复节点受压性能的关键参数,主管修复长度和灌浆料强度的影响较小;优化修复构造,可使主管重量损失28%的锈蚀节点承载力提升至锈蚀前的1.5倍以上。最后,基于修复节点承载力达到1.2倍未锈节点的目标,提出了适用于不同节点锈蚀率的修复建议,可为长期服役后锈蚀钢管结构的修复与性能提升提供参考。Steel welded circular hollow section(CHS)joints are widely adopted,and the corrosion induced degradation threaten the safety and reduce the residual life of them after long-term service.To study the performance of grout-filled GFRP tube repairing corroded circular hollow section(CHS)T-joints,a total of six specimens,including uncorroded,corroded unrepaired and grout-filled GFRP tube repaired CHS T-joints were tested under brace axial compressive loading.The experimental results show that the corroded joints with around10%chord weight loss ratio may lead to about 20%reduction of the ultimate strength.The grout-filled GFRP tube repairing is effective to prevent the ovalization of the chord,by which the joint failure mode changed from chord plasticization into chord punching shear.The ultimate strength and initial stiffness of the repaired chord corroded joints are enhanced by 100%and 50%,respectively,which are higher than those of the corresponding uncorroded ones.Based on the verified finite element models,further parametric analyses indicate that the diameter ratio of the brace to the chord,the thickness of the GFRP tube and the section hollow ratio of the repaired chord are critical parameters that determine the repairing effect.By contrast,the length of the repairing cover and the strength of the grouting layer are found to be less influential.By optimizing the configuration of the grout-filled GFRP tube repairing,the ultimate strength of the corroded joint with 28%chord weight loss ratio can be enhanced by more than 1.5 times to its corresponding uncorroded one.Finally,suggestions are proposed for the repairing of joints with different corrosion ratios,to achieve a 20%ultimate strength enhancement than uncorroded joints after repairing.The current study can provide a reference for both repairing and improving performance of corroded steel tubular joints after long-term service.

关 键 词：圆钢管节点 锈蚀 GFRP管 灌浆 试验研究 有限元分析 

分 类 号：TU391[建筑科学—结构工程] TU317.1