混凝土桥面防水黏结层剪应力有限元分析

Finite Element Analysis on Shear Stress of Waterproofing Bond Layer for Concrete Bridge Deck

采用ANSYS有限元软件模拟分析混凝土桥面沥青铺装结构层间最大剪应力的变化规律。研究表明,防水黏结层的最大剪应力随沥青铺装层厚度、模量增大而降低;当防水黏结层模量为10 MPa~50 MPa时,沥青铺装层底层、防水黏结层的层间最大剪应力波动较大,模量为50 MPa~100 MPa时波动趋势稍缓,超过200 MPa后趋于平缓,因此,优选防水黏结层模量为100 MPa~300 MPa;车辆制动与超载重载对桥面铺装层层间最大剪应力影响显著,摩擦系数从0.2增至1.0时,防水黏结层内部的最大剪应力由0.133 MPa增至0.283 MPa,增幅为112.8%,超载系数与桥面铺装结构层间最大剪应力呈线性正相关,控制车辆超载、重载可有效避免桥面铺装层发生剪切破坏。探求沥青铺装结构层间最大剪应力变化规律,为优选防水黏结层的材料提供理论支撑。

The variation law of the maximum shear stress between layers of concrete bridge deck asphalt pavement is simulated and analyzed by ANSYS finite element software.The results show that the maximum shear stress of the waterproof adhesive layer decreases with the increase of the thickness and modulus of the asphalt pavement,and when the modulus of the waterproof adhesive layer is 10MPa~50MPa,the maximum shear stress between the bottom layer of the asphalt pavement and the waterproof adhesive layer fluctuates greatly,and the trend of 50MPa~100MPa is a little slower,and tends to be smooth when it exceeds 200 MPa,so the modulus of the waterproof adhesive layer is preferred to be 100MPa~300MPa.Vehicle braking and overloading have a great influence on the maximum shear stress between the bridge deck pavement layers.When the friction coefficient increases from 0.2to 1.0,the maximum shear stress inside the waterproof adhesive layer increases from 0.133MPa to 0.283MPa,with an increase of 112.8%.The overloading coefficient is linearly positively correlated with the maximum shear stress of the bridge deck pavement structure.Controlling heavy-duty vehicle and overloading can effectively avoid shear damage of the bridge deck pavement.The purpose of this paper is to explore the variation law of the maximum shear stress between layers of asphalt pavement structure,so as to provide theoretical support for the optimization of waterproof adhesive layer materials.