桥梁无缝化改建对接界沥青路面受力影响

Influence of Bridge Seamless Reconstruction on Stress of Interface Asphalt Pavement

摘要:

为研究服役期内的既有中小跨径桥梁的快速、低成本、低影响无缝化改建对桥头搭板区域沥青路面温度响应的影响，选取了温度场、台后填土摩阻系数为研究参数，进行了有限元力学仿真建模分析并进行了工程验证。研究及应用工程长期监测的结果表明，既有中小跨径桥梁在完成快速、低成本、低影响的无缝化改建后，通过搭板端部的特殊构造及多项加强加韧措施，在循环隐形缝范围内路面的使用性能及耐久性良好，可有效延缓改建区域接界沥青路面反射裂缝的产生时间。研究可为服役期内的既有桥梁无缝化改建的结构设计与应用以及后续养护维修工作提供理论和数据上的支撑。

Abstract:

In order to study the influence of quick, low-cost, low-impact seamless reconstruction of existing small-span and medium-span bridges on the temperature response of asphalt pavement in the bridge-head lapping area, the temperature field and the friction coefficient of backfill behind abutment are selected as research parameters to carry out the finite element mechanical simulation modeling analysis and the engineering verification. The long-term monitoring results of research and application engineering show that after the rapid, low-cost and low-impact seamless reconstruction is completed for the existing small-span and medium-span bridges, through the special construction of lapping end and the multiple strengthening and toughening measures, the applicability and durability of the pavement in the range of circulating invisible joints are good, which can effectively delay the causing time of reflective cracks on the asphalt pavement at the junction of the reconstructed area. The theoretical and data supports can be provided for the structural design and application of seamless reconstruction of existing bridges during the service period and the follow-up maintenance work.