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通过ANSYS软件建立了简支箱梁桥足尺模型,桥面铺装层间采用接触方式,分析了简支箱梁桥在中部偏载作用下沥青混凝土铺装上下面层厚度、弹性模量、层间粘聚力以及层间脱空面积变化对铺装层产生的影响.计算分析结果表明:沥青铺装层上下层厚度变化对铺装层内纵横向拉应力影响明显,增加铺装上层厚度可以减少铺装下层的拉应力和剪应力,增加铺装下层厚度对层间抗剪作用影响不敏感;增加铺装上层弹性模量能减小铺装下层拉应力和剪应力,增加铺装下层弹性模量不能提高铺装层抗剪效果;层间粘聚力大于0.25 MPa时,铺装上下层各应力基本不变;随着铺装层间脱空面积的增大,铺装层上下层相关应力增大,在脱空处容易产生破坏.沥青铺装层层间存在脱空时,铺装层上层纵横向拉应力和剪应力大于铺装层下层的对应应力.
The full-scale model of simply supported box girder bridge is established by ANSYS software. The bridge deck pavement layer adopts the contact mode. The thickness, modulus of elasticity of upper and lower layers of asphalt concrete pavement under the partial load of middle section are analyzed. The inter-layer cohesion and the change of void area between two layers on the pavement.The results of calculation and analysis show that the variation of the thickness of the upper and lower layers of asphalt pavement has obvious influence on the longitudinal and transverse tensile stresses in the pavement, Can reduce the tensile stress and shear stress of the lower pavement and increase the thickness of the lower pavement is not sensitive to the effect of shear resistance between pavements. Increasing the upper elastic modulus of the pavement can reduce the tensile stress and shear stress of the lower pavement, The elastic modulus can not improve the shearing effect of the pavement. When the interlaminar cohesion is greater than 0.25 MPa, the stress on the upper and lower pavement is basically the same. With the increase of the void area between the paving layers, The relevant stress increases and it is easy to cause damage in the void area.When the asphalt pavement layer exists void, the longitudinal and transverse tensile stress and shear stress in the upper layer of paving layer are greater than the corresponding stress in the lower layer of pavement layer.