多车激励下波形钢腹板连续梁桥沥青铺装动力学响应

为研究多车激励作用下大跨径桥梁桥面铺装层的动力学响应，建立含有Fiala轮胎的多刚体实车模型以及大跨径桥梁有限元精细模型，考虑桥面随机不平顺激励，构建包含桥面铺装层的车-桥刚柔耦合系统动力学模型。计算准静态条件下桥梁控制截面的挠度，并与现场静载试验进行对比，验证了所建车-桥耦合模型的正确性与计算结果的有效性。研究不同编队多车荷载作用下波形钢腹板连续箱梁桥铺装的动力响应，不同工况对于车辆后轴悬架力和垂向轮胎力的影响，结果表明：多车荷载相比于单个车辆荷载所引起的动力响应更大，更容易引起桥面铺装和桥梁结构的早期损伤；在车辆数量相同、车速相同、前后车距相等的情况下，车辆行驶编队不同时所引起的桥面铺装层最大挠度、最大纵向应力和最大横向剪应力分别增大了19.7%、23.5%和8.0%,且最大纵向拉应力和剪应力均发生在防水混凝土-混凝土梁之间，容易产生早期疲劳开裂；车辆后轴悬架力随着载重增加而增大，垂向轮胎力随着速度和载重增加而增大。

Dynamic Response of Asphalt Pavement of Continuous Girder Bridge with Corrugated Steel Webs Excited by Multiple vehicles

In order to study the dynamic response of long-span bridge deck pavement under multi vehicle excitation, the multi rigid body vehicle model with Fiala tires and the finite element fine model of long-span bridges are established. Considering the random irregularity excitation of the bridge deck, the dynamic model of vehicle-bridge rigid -flexible coupled system including the bridge deck pavement was constructed. The deflection of bridge deck pavement under the static load was obtained and compared with the field test. The dynamic response of deck pavement of continuous box girder bridge with corrugated steel webs under different multi vehicle loads, as well as the influence of different working conditions on vehicle rear axle suspension force and vertical tire force were studied. The results show that the dynamic response caused by multi vehicle load is larger than that caused by single vehicle load, and it is easier to cause the early damage of the deck pavement and bridge structure. When the number of vehicles, speed and distance between front and rear vehicles are the same, the maximum deflection, the maximum longitudinal stress and the maximum transverse shear stress of the deck pavement caused by different vehicle formation increase by 19.7%, 23.5% and 8.0% respectively. The maximum longitudinal tensile stress and shear stress occur between the waterproof concrete and the concrete beam, which may be easy to cause early fatigue cracking. The rear axle suspension force of the vehicle increases as the load increases, and the vertical tire force increases with the increase of speed and load.