大挑臂预应力混凝土箱梁汽车荷载偏载效应研究

Research on the effects of eccentric load caused by vehicle on the prestressed concrete box girder with large cantilever

以大挑臂预应力混凝土箱梁为背景,研究多车道汽车荷载在横向不同加载位置对结构的影响。采用大型通用有限元程序ANSYS建立全桥实体模型,对汽车荷载的偏载效应进行分析。通过对不同车道数汽车荷载对称布载和偏载布载的对比分析,得到了不同车道数加载时结构偏载系数,并在此基础上提出了基于多车道数的偏载效应修正方法。该类型桥梁汽车荷载偏载系数在1.18~1.34之间。

Based on the prestressed concrete box girder with large cantilever, this paper studies the influence of multi Lane vehicle load on the structure at different lateral loading positions. The solid model of the bridge is established by using the large general finite element program ANSYS, and the eccentric load effect of vehicle load is analyzed. Through the comparative analysis of symmetrical load distribution and eccentric load distribution of vehicle load with different number of lanes, the structural eccentric load coefficient under different number of lanes is obtained, and on this basis, the correction method of eccentric load effect based on multi number of lanes is proposed. The eccentric load effect coefficient of this type of bridge is between 1.18 and 1.34.