混凝土桥面沥青铺装结构的剪切分析

车辙和推移是混凝土桥面沥青铺装结构的主要破坏形式之一,一方面是由于行车荷载作用下沥青层内产生较大的剪应力而引起沥青铺装层的塑性流动而逐渐形成车辙;另一方面是沥青混凝土面层和桥面层间粘结力不足而引起的推移、拥抱等剪切破坏。试图通过三维有限元的计算方法,考虑荷载的非均匀分布,系统分析层间接触条件不同时,不同铺装层结构组合时的剪应力响应。分析显示,非均布荷载和层间接触条件对铺装层结构的剪应力有很大影响,合理的材料设计和结构组合对沥青混凝土桥面铺装具有重要意义。

Shear Stress Response Analysis of Asphalt Concrete Pavement for Concrete Bridge Deck

Rutting or the perpetual deformation is one of the main distresses of the asphalt pavement on concrete bridge deck.On the one hand,the great shear stress in the asphalt layer under the traffic loads could cause the plastic deformation,which would accumulate and form the rutting.On the other hand,the weak cohesion between asphalt layer and bridge deck is another reason for the shear distress such as upheaval and bumps,etc.on the bridge deck asphalt pavement.In this article,the 3D FEM is employed to analyze the shear stress response of decks with different structure combination under the non-uniform loads and in the different interlayer touch conditions.The result shows that the non-uniform loads and the interlayer touch condition will greatly affect the shear stress response,therefore the effective material design combined with rational structure combination is very important for the asphalt pavement of bridge deck.