摘要
为明确大纵肋正交异性钢-免蒸养UHPC组合桥面板的力学性能,进行免蒸养UHPC材料力学性能试验、构件静力模型试验与疲劳模型试验,分析其材料基本力学性能、剪力钉抗剪性能、组合桥面板抗弯性能及疲劳性能。结果表明:免蒸养UHPC材料的弹性模量略高于高温蒸养UHPC材料,其他力学性能指标相较于高温蒸养UHPC材料均有不同程度的降低;免蒸养UHPC中剪力钉的破坏模式表现为剪力钉根部剪断并伴有焊环局部UHPC压溃,组合桥面板名义开裂应力为13.7 MPa,满足结构抗裂性要求;组合桥面板的疲劳破坏模式表现为UHPC结构层开裂,继而纵肋与横隔板连接焊缝焊趾处疲劳开裂,组合桥面板的疲劳寿命最终由焊接细节的疲劳强度所控制;纵肋与横隔板连接焊缝的等效疲劳强度为157 MPa,满足现行规范要求。
Tests were conducted to investigate the mechanical property of the composite deck system consisting of orthotropic steel plates with large longitudinal ribs and steam-curing-free UHPC overlay.The material property of UHPC,shear strength of shear studs as well as flexural strength and fatigue performance of the composite deck system were analyzed.The results show that the elastic modulus of the steam-curing-free UHPC is higher than that of the thermal-curing UHPC,while the other indexes of the mechanical property go down to different extents.The failure of shear studs in steam-curing-free UHPC is associated with stud root fracture and local crushing of UHPC around welding ring.The nominal cracking stress of the composite deck system is 13.7 MPa,meeting the anti-cracking performance of the structure.The fatigue of the composite deck system starts from the cracking of the UHPC course,then followed the occurrence of cracks in the toes of the welded joints of the longitudinal ribs and diaphragms,consequently the fatigue strength of the welding details dominates the fatigue life of the composite deck system.The equivalent fatigue strength of the welded joint of the longitudinal rib and diaphragm is 157 MPa,meeting the requirements of the current codes.
作者
刘益铭
张清华
卜一之
田启贤
LIU Yi-ming;ZHANG Qing-hua;BU Yi-zhi;TIAN Qi-xian(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Key Laboratory of Intelligent and Green Bridge Construction,Wuhan 430034,China;China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan 430050,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第2期36-43,共8页
Bridge Construction
基金
国家自然科学基金项目(52008218,51878561)
中国博士后科学基金项目(2022M710048)。
