车桥耦合下钢桥面沥青铺装层动力响应研究

为了研究钢桥面沥青铺装层的动力响应，将车辆车体看成刚体并以匀速进行运动，车辆悬架与车轮均视为由弹簧和阻尼器所组成，将桥面沥青铺装层和钢板视为双层连续粘弹性薄板，并以铺装层表面不平度作为系统的附加激励，车辆和桥面铺装层间采用点接触模型，最终建立车辆-沥青铺装层-钢桥耦合动力学模型，进而采用Wilson-θ法求解系统方程组。在此基础上，应用Fortran语言实现模型的计算，并结合现场测试结果验证程序的准确性和可靠性。研究结果表明:对于钢桥面沥青铺装层，移动车辆产生的动力效应显著，随着后轴轴重的增加，铺装层表面应变幅值和铺装层与钢板间的最大剪应力呈线性增加；随着行车速度增加，铺装层表面应变幅值和铺装层与钢板间的最大剪应力上下波动变化，但两者均在60 km/h的行车速度下数值达到最大；桥梁跨径和桥面宽度对铺装层表面应变幅值和铺装层与钢板间最大剪应力的影响较为显著，桥梁跨径的影响尤为明显。

DYNAMIC RESPONSE OF STEEL DECK ASPHALT PAVEMENT CONSIDERING VEHICLE-BRIDGE COUPLING EFFECT

In order to study the dynamic response of asphalt pavement of steel deck, a dynamics model with vehicle-bridge deck asphalt pavement -steel bridge coupling effect is established. In the model, the vehicle body is regarded as a rigid body moving with a constant speed, and the vehicle suspension and wheels are composed of springs and damping devices. The asphalt pavement of bridge deck and steel plate are treated as double-layer continuous viscoelastic sheet. The unevenness of the pavement surface is the source of additional excitation, and the point contact model is used to connect the asphalt pavement and the vehicle. Wilson-θ method is used to solve the system equations. On this basis, the corresponding calculation program is developed with Fortran language. The reliability and accuracy of the program are verified according to the measured data. The results show that the dynamic effects of the moving vehicle are remarkable. With the increase of rear axis loads, the peak strain of pavement surface and the maximum shear stress between bridge deck pavement and steel plate display a linear increase. With the increase of moving speed, the peak strain of pavement surface and the maximum shear stress between bridge deck pavement and steel plate fluctuate within a range, but both of them reach the maximum values at 60 km/h speed. Bridge span and bridge width show a significant effect on the peak strain of pavement surface and the maximum shear stress between bridge deck pavement and steel plate, especially the bridge span.