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为了解决传统桥面铺装设计方法不能反映在行车荷载与桥梁振动特性耦合作用条件下的铺装动力响应问题,提出一种面向桥面铺装动力响应分析的多尺度桥梁模型的构建新方法。该方法首先综合考虑桥面铺装和桥梁结构特性对建模的要求,建立整桥有限元仿真模型,然后构建精细化桥面铺装体系局部梁段模型,最后通过动力子结构方法将整桥结构与桥面铺装局部结构衔接,并以某大跨径悬索桥为例进行实例分析。结果表明:由于考虑整桥动力特性和不平度的影响,将使计算结果(不平度等级为A)比静力计算结果大10%～15%,并且随着不平度的增加而非线性增加;采用该模型的构建方法可以避免现行桥面铺装设计中采用静载偏不安全的缺点。
In order to solve the problem that traditional bridge deck pavement design method can not reflect the dynamic response of pavement under the coupling action of driving load and bridge vibration characteristics, a new method of constructing multi-scale bridge model for deck pavement dynamic response analysis is proposed. The method first considers the requirements of the bridge deck and bridge structural characteristics of the model, the establishment of finite element simulation model of the whole bridge, and then build a fine bridge deck partial beam system model, and finally through the substructure method of the entire bridge The structure is connected with the local structure of deck pavement, and a case study is carried out with a long span suspension bridge as an example. The results show that the calculation results (the roughness level A) is 10% ~ 15% larger than the static calculation result due to the consideration of the dynamic characteristics of the bridge and the unevenness, and increases nonlinearly with the increase of the roughness. The construction method of the model can avoid the disadvantage of static load unsafe in the current deck pavement design.