摘要
为探究钢-UHPC组合结构中栓钉连接件的疲劳性能,基于SWT方法与断裂力学理论,建立了考虑栓钉焊接细节的1/4推出试验有限元模型,以研究钢-UHPC组合结构中短栓钉的疲劳寿命预测方法。通过定义材料非线性特性研究栓钉的荷载-滑移曲线与应力分布规律,得出栓钉焊接细节的最不利位置,及其临界平面,由此计算其裂纹萌生寿命,以及稳步扩展疲劳裂纹寿命,对栓钉疲劳性能进行评估,最后提出了基于有限元计算得出的栓钉疲劳寿命预测公式。结果表明:通过建立栓钉焊趾细节能够较好地模拟UHPC中短栓钉的荷载-滑移特性,方法和所提出的疲劳寿命预测公式能较好地预测栓钉的疲劳寿命,疲劳应力幅值对栓钉的损伤参数影响较大,疲劳裂纹萌生寿命所占比例最大可达90%以上,研究内容可为钢-UHPC组合结构中栓钉的疲劳性能评估提供参考。
In order to explore the fatigue performance of stud connectorsinsteel-UHPC composite structures,based on the SWT method and fracture mechanics theory,a 1/4 push-out test finite element model was established considering stud welding details,and the fatigue life prediction method of short stud in steel-UHPC composite members was studied.The load-slip curve and stress distribution of the stud are studied by defining the nonlinear characteristics of the material,and the most unfavorable position and the critical plane of the stud welding details were obtained,and the crack initiation life and the fatigue crack life of steady propagation were calculated,and the fatigue performance of the stud was evaluated.Finally,the fatigue life prediction formula of the stud connectors based on the finite element calculation was proposed.The results show that the load-slip characteristics of short stud connectors in UHPC can be better simulated by establishing the weld details of the studs,and the proposed method and fatigue life prediction formula can better predict the fatigue life of the studs.The fatigue stress amplitude has a great influence on the damage parameters of the stud,and the initiation life of the fatigue crack accounts for more than 90%.The research results can provide a reference for the evaluation of the fatigue performance of the stud in steel-UHPC compositestructures.
作者
孙艳华
谭本坤
雷顺成
魏维
SUN Yanhua;TAN Benkun;LEI Shuncheng;WEI Wei(Hunan Lianzhi Technology Co.,Ltd.Changsha,Hunan 410200,China;Changsha University of Science and Techonology,Changsha,Hunan 410114,China;Hunan Communications Research Institute Co., Ltd., Changsha, Hunan 410015,China)
出处
《公路工程》
2022年第2期70-76,共7页
Highway Engineering
基金
基于云平台的大跨度桥梁运营期智能化监测与安全预警研究项目(ky-20-05(1))
湖南省交通科技项目(201826)。
