桥面沥青铺装层间应力分析简化模型

在分析总结桥面铺装结构承载特性的基础上,提出采用叠层梁作为桥面沥青铺装层间应力计算的简化模型。为避免梁端部层间应力的奇异性,假设钢板和沥青铺装层均满足平衡与变形协调条件,梁端部剪应力分布与梁中部一致,在此基础上推导简支叠层梁层间应力计算公式,最终得到桥面沥青铺装层间应力计算的实用公式,并根据圣维南原理说明了假设边界条件的合理性。利用所得实用公式分别计算分析钢桥面沥青铺装与混凝土桥面沥青铺装的层间应力,分析确定公式使用时的条件与参数取值。通过将公式计算结果与有限元计算结果相对比,验证公式的可用性与参数取值的合理性。通过对比钢桥面沥青铺装与混凝土桥面沥青铺装层间应力计算结果,得到钢桥面沥青铺装对防水黏结层材料具有更高的要求。

A simplified model for interlaminar stress analysis of bridge asphalt pavement

Delaminating is one of the main fatigue damage modes of bridge asphalt pavement.Based on generalizing the structure characteristics of bridge asphalt pavement,the laminated beam model is developed as for bridge asphalt pavement.In order to avoid the singularity of interlaminar stress,it is assumed that the conditions of equilibrium and deformation compatibility of steel deck and asphalt pavement are similar.The distributions of shearing stress in the end and in the middle of the beam are consistent with each other,and thereupon,a formula for interlaminar stress in bridge asphalt pavement is derived.The rationale of the assumed boundary conditions is expounded by using the Saint Venant principle.The interlaminar stresses in steel bridge asphalt pavement and concrete bridge asphalt pavement are calculated by using this formula,and the results are in good agreement with those of FEM analysis.It is shown that the requirement on waterproof-bonding layer is stricter in steel bridge pavement than concrete bridge pavement.