碳纤维布加固损伤T型圆管节点的抗压承载性能分析  

ANALYSIS OF COMPRESSIVE BEARING CAPACITY OF DAMAGED TUBULAR T-JOINTS REINFORCED BY CFRP SHEETS

作　　者：郭震 马张永 刘艳 杨博艺 邓芃 GUO Zhen;MA Zhangyong;LIU Yan;YANG Boyi;DENG Peng(Gansu Construction Investment(Holdings)Group Corporation Steel Structure Co.,Ltd.,Lanzhou 730000,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]甘肃建投钢结构有限公司,兰州730000 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《工业建筑》2020年第8期166-171,共6页Industrial Construction

基　　金：甘肃省建设科技项目(JK2020-13);甘肃建投钢结构有限公司资助项目(02040043303)。

摘　　要：通过设置生死单元和Bao-Wierzbickis准则模拟荷载对节点造成的损伤、碳纤维加固以及再次加载的历程,并获得理想的计算精度。对主、支管直径比β介于0.63~0.76,主管半径与壁厚比γ介于9.70~16.92的111个T型圆管节点模型进行分析,通过对相贯线周围测点等效塑性应变的比较,分析了碳纤维复材(CFRP)加固作用的机理;通过与参照试件的对比,分析了不同损伤情况对节点承载能力的影响。研究结果表明:当主管的凹陷位移约为主管直径的1/5时,CFRP几乎失去了加固效果;受损节点的最大承载力随主管的直径、CFRP的弹性模量及其厚度的增加而增加,随主管厚度的增加而减小,CFRP的缠绕方式越接近环向时对受损节点的加固效果越好。By setting the activation and deactivation elements and the Bao-Wierzbickis damage criterion,the loading and carbon fiber reinforcement process and the damage situation of the joint area can be simulated,and the ideal calculation accuracy can be obtained.111 models(0.63≤β≤0.76,9.70≤γ≤16.92)were numerically analyzed,and the mechanism of CFRP reinforcement was analyzed by comparing the equivalent plastic strains of the measuring points around the intersection line.And by comparing with the reference specimen,the influence of different damage conditions on the bearing capacity of the joints was analyzed.The research results showed that CFRP almost lost the reinforcement effect when the depression displacement of the chord is about one-fifth of the diameter of the chord;the maximum bearing capacity of the damaged joint increased with the increase of the diameter of the chord and the elastic modulus and thickness of the CFRP,and decreased with the thickness of the chord.When the winding orientations of CFRP was close to the circumferential direction,the reinforcement effect of the damaged joint was better.

关 键 词：碳纤维 损伤程度 圆钢管T型节点 数值模拟 

分 类 号：TU392.3[建筑科学—结构工程]