采用单轮车桥耦合模型的连续梁桥动力响应研究

Research on Dynamic Response of a Continuous Beam Bridge Based on Single Wheel Vehicle Bridge Coupling Model

以某五跨连续梁桥为工程背景,采用单轮车桥耦合模型,对影响该桥动力响应的相关因素进行研究。基于ANSYS软件建立了该连续梁桥的车桥耦合模型,研究了车辆过桥速度、车辆重量和汽车悬挂弹簧刚度等三个因素对桥梁动力响应的影响。研究表明:当车速为40km/h和100 km/h时,中跨跨中的位移最大值为10.3mm和10.7 mm,说明车速对中跨跨中位移影响不明显。当车速在40 km/h和120 km/h时,中跨跨中加速度分别为0.7m/s^(2)和2.5 m/s^(2),说明车速对中跨跨中加速度影响更明显;当车身重量为15t和55t时,中跨跨中的最大位移分别为0.91mm和1.07mm,最大加速度分别为0.009m/s^(2)和2.88m/s^(2),说明随着车身重量的增加,中跨跨中位移和加速度都有明显增加;当汽车悬挂弹簧刚度采用初始值的0.5倍和4倍时,中跨跨中最大位移和最大加速度均为1.06 mm和2.27m/s^(2),说明汽车弹簧刚度的变化对中跨跨中位移和加速度几乎没有影响。

Based on single wheel vehicle coupling model,relevant factors affecting dynamic responses of a five-span continuous beam bridge was studied.A vehicle bridge coupling model of the continuous beam bridge was established based on ANSYS software,and the influences of three factors,including vehicle speed,vehicle weight,and suspension spring stiffness,on the dynamic response of the bridge were studied.The results show that when the vehicle speeds are 40 km/h and 100 km/h,the maximum displacements of the mid-span are 10.3 mm and 10.7 mm,indicating that the influence of vehicle speed on the mid-span displacement is not significant.When the vehicle speeds are 40 km/h and 120 km/h,the mid-span accelerations are 0.7 m/s^(2) and 2.5 m/s^(2),respectively,indicating that the vehicle speed has a more significant impact on the mid-span acceleration.When the vehicle weights are 15 t and 55 t,the maximum accelerations at the mid-span are 0.91 mm and 1.07 mm,respectively,and the maximum accelerations are 0.009 m/s^(2) and 2.88 m/s^(2),indicating that the vehicle weight has a significant effect in mid-span displacement and acceleration.When the stiffness of the vehicle suspension spring are 0.5 times and 4 times of the initial value,the maximum displacement and maximum acceleration in the mid-span are both 1.06 mm and 2.27 m/s^(2),indicating that the change in vehicle spring stiffness has almost no effect on the mid-span displacement and acceleration.