摘要
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.
In this study,we established a finite element model for the T-connection between a steel tube and gusset plate.We adopted a void growth model(VGM),based on the micromechanical fracture mechanism,for predicting the ductile fracture of the T-connection under bending.We found the predictions of the fracture location and fracture load to be consistent with the test results,thereby validating the fracture criterion of the VGM.Based on the VGM,we then programmed the user-subroutine VUMAT with a continuum damage criterion.With the usersubroutine,we numerically simulated the propagation of a ductile fracture of the T-connection under bending.We found that the ultimate failure of the T-connection was plastic tearing of the tube wall.The obtained failure mode and the corresponding ultimate loading capacity agree well with the test results.We compared the ultimate loading capacities of excessive plastic deformation and punching shear failure,and the results showed that the loading capacity of the studied T-connection under bending was controlled by the limit of excessive plastic deformation.
作者
尹越
徐丽森
郑力
Yin Yue;Xu Lisen;Zheng Li(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coast Civil Structure and Safety of Ministry of Education(Tianjin University),Tianjin 300072,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2019年第A02期127-133,共7页
Journal of Tianjin University：Science and Technology
关键词
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
T-connections between steel tube and gusset plate
ductile fracture
ultimate loading capacity
void growth model
propagation of ductile fracture
