基于有限元分析的简支梁桥桥面防水粘结层力学响应研究

Mechanical Response Study on Bridge Deck Waterproofing Adhesive Layer in Simply Supported Beam Bridges by Finite Element Analysis

防水粘结层被破坏是导致简支梁桥桥面铺装出现病害的主要原因。通过数值模拟对不同简支梁桥桥型进行防水粘结层力学响应分析,明确防水粘结层在不同桥型结构中的受力状态,总结沥青铺装层模量和厚度对防水粘结层力学响应指标的影响。研究结果表明,简支梁桥桥型对防水粘结层力学响应的影响不大;增加沥青铺装层模量对控制防水粘结层最大拉应力和沥青铺装层变形能起到较好的作用;增加沥青铺装层厚度能有效控制防水粘结层法向拉应力和分散车轮荷载。研究结果能够为桥面铺装的结构设计提供理论基础,提高简支梁桥的服役寿命。

The failure of the waterproofing adhesive layer is a primary cause of disease in the pavement of simply supported beam bridges.In this study,the mechanical response of waterproofing adhesive layers in different types of simply supported beam bridge were analyzed by numerical simulations to clarify the stress states and summarize the influence of the modulus and thickness of asphalt paving layer on the mechanical response indicators of the waterproofing adhesive layer.The results indicate that the bridge type of simply supported beam bridges has minor impact on the mechanical response of the waterproofing adhesive layer;Increasing the modulus of the asphalt paving layer has a favorable effect on controlling the maximum tensile stress and the deformation of the asphalt paving layer;Additionally,increasing the thickness of the asphalt paving layer can effectively control the normal tensile stress of waterproofing adhesive layer and disperse wheel loads.The research can provide a theoretical basis for the structural design of bridge deck pavement and improve the service life of simply supported beam bridges.