尹 越 ^{1, 2} ，徐丽森 ¹，郑 力 ¹
AuthorsHTML:尹 越 ^{1, 2} ，徐丽森 ¹，郑 力 ¹
AuthorsListE:Yin Yue ^{1, 2}，Xu Lisen ¹，Zheng Li ¹
AuthorsHTMLE:Yin Yue ^{1, 2}，Xu Lisen ¹，Zheng Li ¹
Unit:(1. 天津大学建筑工程学院，天津 300072；2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072)
Unit_EngLish:(1. School of Civil Engineering，Tianjin University，Tianjin 300072，China；2. Key Laboratory of Coast CivilStructure and Safety of Ministry of Education(Tianjin University)，Tianjin 300072，China)
Abstract_Chinese:建立了钢管-节点板 T 形连接有限元模型，采用基于微观断裂机制的空穴扩张模型(VGM)对钢管-节点板 T形受弯连接进行韧性断裂预测，预测的断裂位置及断裂荷载与试验结果基本一致，验证了空穴扩张模型的断裂判据．结合基于 VGM 的连续损伤模型，编制 VUMAT 用户子程序，对钢管-节点板 T 形受弯连接的韧性断裂扩展进行了数值模拟，确定连接的最终失效模式为冲剪作用导致的钢管管壁的撕裂破坏，该失效模式及其对应的极限承载力与试验结果相符．比较了钢管-节点板 T 形受弯连接发生过大塑性变形和冲剪破坏 2 种极限状态对应的极限承载力，结果表明所研究的钢管-节点板 T 形受弯连接的抗弯承载力由其变形极限状态控制．
Abstract_English:In this study，we established a finite element model for the T-connection between a steel tube and gussetplate．We adopted a void growth model(VGM)，based on the micromechanical fracture mechanism，for predictingthe ductile fracture of the T-connection under bending．We found the predictions of the fracture location and fractureload to be consistent with the test results，thereby validating the fracture criterion of the VGM．Based on theVGM，we then programmed the user-subroutine VUMAT with a continuum damage criterion．With the usersubroutine，wenumerically simulated the propagation of a ductile fracture of the T-connection under bending．Wefound that the ultimate failure of the T-connection was plastic tearing of the tube wall．The obtained failure mode andthe corresponding ultimate loading capacity agree well with the test results．We compared the ultimate loading capacitiesof excessive plastic deformation and punching shear failure，and the results showed that the loading capacityof the studied T-connection under bending was controlled by the limit of excessive plastic deformation．
Keyword_Chinese:钢管-节点板 T 形受弯连接；韧性断裂；极限承载力；空穴扩张模型；断裂扩展
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