碳纤维布(CFRP)加固T形圆钢管节点的静力性能研究  

A Study on the Performance of Tubular T-Joints Strengthened with CFRP Subjected to Monotonic Loading

作　　者：宋生志[1] 魏建军[1] 陈成[2] 

机构地区：[1]江苏建筑职业技术学院江苏省建筑安全与减灾工程技术研发中心,江苏徐州221116 [2]烟台大学土木工程学院,山东烟台264005

出　　处：《建筑钢结构进展》2015年第2期57-64,共8页Progress in Steel Building Structures

基　　金：江苏省建设系统科技计划项目(2013ZD13)

摘　　要：通过对两个足尺T形圆钢管节点进行支管轴向静力加载试验,研究了未加固试件和碳纤维布(CFRP)加固试件的破坏模式及静力性能。试验结果的对比表明:未加固试件在支管轴力作用下,由于主管的径向刚度远小于支管的轴向刚度而容易发生主管表面的局部屈曲;由于CFRP对主管的约束作用,有效地限制了主管表面的局部屈曲,试件最终发生了整体强度屈服破坏。对比分析基于试验测试得到的荷载-位移曲线,发现CFRP加固试件的极限承载力比未加固的试件高17.8%,说明CFRP可以有效地提高管节点的静力性能。采用有限元软件ABAQUS对CFRP加固节点进行模拟,通过与试验测试结果的对比,验证了有限元模型的准确性。在此基础上,对CFRP加固T形管节点进行参数分析,参数主要考虑了主、支管管径比、主管的径厚比以及CFRP黏贴长度、方向和层数分别对管节点加固效果的影响,并给出各参数的影响规律。This paper presents an experimental study on the performance of tubular T-joints subjected to monotonic loading.Two full-scale specimens,one unstrengthened and one strengthened with CFRP laminates,are tested under the axial compressive loading along the brace member.The test results show the local buckling occurs on the surface of chord member near the weld toe for the unstrengthened specimen.This is mainly attributed to the fact that the radial stiffness of chord member is weaker than the axial stiffness of branch member.While for CFRP strengthened specimen,the local buckling of chord member is significantly reduced due to the confining effect of CFRP laminates,and an overall strength failure occurs at last.The load-displacement curves indicate the ultimate load capacity of strengthened T-joint increases 17.8% than that of unstrengthened one.Therefore,CFRP laminates can effectively enhance the load capacity of T-joint.Finite element analysis is also conducted to simulate the behavior of CFRP strengthened T-joint.The finite element model is validated by comparing analysis results with test data.Further,a parametric study is also carried out,to evaluate the effect of diameter ratio of branch member over chord member,diameter-thickness ratio of chord member,adhesive length,direction and layers of CFRP laminates to the ultimate loadcapacity of tubular T-joint.

关 键 词：T形圆钢管节点 碳纤维布 极限承载力 试验研究 有限元分析 

分 类 号：TU398[建筑科学—结构工程]