X形软钢阻尼器延性断裂的试验研究与数值模拟  

Experimental study and numerical simulation on ductile fracture of X⁃shaped mild steel damper

作　　者：谢丽宇[1] 仝运佳 薛松涛[1,2] 李林[1] 王兵[1] XIE Liyu;TONG Yunjia;XUE Songtao;LI Lin;WANG Bing(Department of Disaster Mitigation for Structures,Tongji University,Shanghai 200092,China;Department of Architecture,Tohoku Institute of Technology,Sendai 982-8577,Japan)

机构地区：[1]同济大学结构防灾减灾工程系,上海200092 [2]日本东北工业大学工学部,仙台982-8577

出　　处：《建筑结构》2024年第7期59-63,71,共6页Building Structure

基　　金：国家自然科学基金(51778490),上海市自然科学基金(20ZR1461800)。

摘　　要：为了研究X形软钢阻尼器在大变形状态下的耗能性能和损伤演化规律,设计了6组试件进行单向和循环荷载作用下延性断裂的试验研究,分析了软钢阻尼器的破坏过程和滞回曲线。采用Lemaitre-Chaboche混合强化模型,分别对各工况下包含与不包含基于应力三轴度的钢材微观损伤模型的软钢阻尼器进行了精细的有限元模拟。对比有限元模拟结果和试验结果,分析结果表明,颈部为X形耗能软钢阻尼器的薄弱位置,最容易发生集中损伤甚至破坏。考虑钢材损伤准则的有限元模拟的荷载-位移曲线与试验结果更加吻合,能够表征软钢阻尼器的承载力与刚度退化现象,并能较为准确地预测软钢阻尼器的损伤演化过程和断裂破坏位置。In order to study the energy dissipation performance and damage evolution of X-shaped mild steel dampers under large deformation,6 groups of specimens were designed for experimental study of ductile fracture under unidirectional and cyclic loads,and the failure process and hysteresis curve of the dampers were analyzed.Using Lemaitre-Chaboche hybrid strengthening model,the finite element simulation of mild steel dampers with and without the steel microdamage model based on stress triaxiality was carried out under different working conditions.Comparing the finite element simulation results with the test results,the analysis results show that the neck is the weak position of the X-shaped energy-consuming mild steel damper,which is most prone to concentrated damage or even destruction.The load-displacement curve of finite element simulation considering steel damage criteria is more consistent with the test results,which can characterize the bearing capacity and stiffness degradation of mild steel dampers,and predict the damage evolution process and fracture location of mild steel dampers more accurately.

关 键 词：X形软钢阻尼器 应力三轴度 损伤模型 延性断裂 承载力退化 

分 类 号：TU352[建筑科学—结构工程]