钢桥面聚氨酯改性环氧树脂黏结层的受力特性

Stress characteristics of the polyurethane-modified epoxy resin bonding layer on the steel bridge deck

为分析钢箱梁铺装层与钢桥面黏结层间的受力特性,采用有限元软件ANASYS建立钢箱梁整桥模型,采用聚氨酯改性环氧树脂作为钢桥面铺装结构的黏结层,模拟计算分析车辆荷载工况、钢桥跨径、铺装层厚度、黏结层厚度、温度变化、水平荷载等不同因素对黏结层界面受力的影响。结果表明:正常行驶条件下,黏结层界面横向剪应力显著大于纵向剪应力,车辆荷载作用于钢箱梁间且距横隔梁纵向距离越大时黏结层界面剪应力越不利,荷载作用于钢箱梁边缘且靠近横隔梁时界面法向拉应力最不利;钢桥跨径对黏结层受力影响较小;随黏结层厚度增大,黏结层界面剪应力减小,法向拉应力增大;随铺装层厚度增大,黏结层界面剪应力和界面法向拉应力减小;随温度升高,黏结层界面应力显著减小;随摩擦因数增大,黏结层界面剪应力增大,法向拉应力变化不大。

To analyze the force characteristics between the steel box girder pavement layer and the steel bridge deck bonding layer,a steel box girder bridge model is established using the finite element software ANASYS.Polyurethane-modified epoxy resin is used as the bonding layer for the steel bridge deck pavement structure.Various vehicle load conditions,steel bridge spans,pavement layer thicknesses,bonding layer thicknesses,temperature variations,and horizontal loads are simulated and analyzed to study the force effects on the bonding layer.The results indicate that under normal driving conditions,the transverse shear stress at the bonding layer interface is significantly greater than the longitudinal shear stress.The most unfavorable condition for the shear stress at the bonding layer interface is when the vehicle load acts between steel box girders and longitudinally away from the transverse diaphragm.When the load acts on the edge of the steel box girder and near the transverse diaphragm,the normal tensile stress between layers is most unfavorable.The span has little influence on the force of the bonding layer.As the thickness of the bonding layer increases,the shear stress at the interface decreases while the normal tensile stress increases.With the increase of pavement layer thickness,the transverse shear stress at the bonding layer interface and the normal tensile stress between layers decreases.With the rise in ambient temperature,the stress at the bonding layer interface significantly decreases.As the friction coefficient increases,the shear stress at the interface increases,while the normal tensile stress remains relatively unchanged.