摘要
我国高速铁路在里程和技术上不断突破,在较多的高铁关键性工程中采用混合梁斜拉桥这种新型桥梁.钢-混结合段是混合梁斜拉桥关键构造之一,本研究采用有限元模型对某大跨度斜拉桥钢-混结合段进行局部仿真分析,得到以下结论:1)结合段钢结构部分整体应力水平较低,但在焊接部位,尤其与承压板焊接部位易产生应力集中现象;2)结合段混凝土梁整体处于全截面受压状态,与承压板、剪力键及预应力钢绞线接触部位易产生较大拉应力;3)沿桥梁纵向钢结构应力过渡较平顺,在混凝土注浆孔部位有一定应力突变,应合理设置注浆孔.
China s high-speed railway continues to make breakthroughs in mileage and technology.In many key projects of high-speed railway,hybrid girder cable-stayed bridge is adopted.The steel-concrete composite section is one of the key structures of the hybrid girder cable-stayed bridge.In this paper,the finite element model is used to simulate the steel-concrete joint section of a long-span cable-stayed bridge.The following conclusions are obtained:1)the overall stress level of the steel structure of the combination section is low,but the stress concentration can easily occur at the welding part,especially the welding part with the bearing plate;2)the concrete beam of the combination section is in a state when the total cross-section is under pressure,and the contact area with the bearing plate,the shear connector and the prestress wire can easily generate stronger tensile stress;3)the stress transition along the longitudinal steel structure of the bridge is smooth,and there is a certain stress mutation in the concrete grouting hole,so the grouting hole should be set reasonably.
作者
周阳
周佳雨
蒋李志宏
张永奇
罗健辉
曾川
蒋伟
ZHOU Yang;ZHOU Jiayu;JIANG Lizhihong;ZHANG Yongqi;LUO Jianhui;ZENG Chuan;JIANG Wei(School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)
出处
《成都大学学报（自然科学版）》
2020年第4期444-448,共5页
Journal of Chengdu University（Natural Science Edition）
基金
成都大学校青年基金项目(2018XZB18)
成都大学大学生创新训练计划孵化培育项目(CDU_CX_2020280)。
关键词
高速铁路
混合梁斜拉桥
钢-混结合段
力学性能
high speed railway
hybrid girder cable-stayed bridge
steel-concrete composite section
mechanical properties
