混凝土桥面沥青铺装粘结层抗剪设计方法

A Design Guide to Shear Resistance of Bonding Layer in Concrete Bridge Deck Asphalt Pavement

介绍一种新的混凝土桥面沥青铺装粘结层抗剪设计方法.采用有限元法分析混凝土桥面铺装粘结层水平剪应力与法向正应力的分布关系.基于该关系图提出层间剪应力临界边界,分别从铺装结构参数、荷载方面分析影响层间剪应力临界边界的因素,给出了临界边界方程形式,并检验其合理性.提出荷载作用下满足层间不发生剪切破坏的基本条件为:层间剪切强度包络线与临界边界相离.最后给出了应用算例.

A new approach to evaluate shear resistance of bonding layer in concrete bridge deck asphalt pavement was proposed. The distributions for shear stress and normal stress in the interface between asphalt pavement and bridge slab under vertical and horizontal load were analyzed by finite element method. Based on the scattergram of shear stress and normal stress, the conception of shear stress critical boundary was proposed. Parameters of pavement and load were considered to analyze its effects on critical boundary. Also, equation formation of critical boundary was tested by χ2-test. The basic condition to guarantee the performance of shear resistance for bonding layer was that there was no intersection of shear stress critical boundary and shear intensity envelope line, which was the design standard for bonding layer in concrete bridge deck asphalt pavement. Finally, a case study was presented.