路桥过渡段柔性搭板的设计方法

在对路桥过渡段柔性搭板处治措施的机理进行分析的基础上,参考大比例尺沉降台试验测试数据及有限元仿真与拓扑优化的结果,提出路桥过渡段柔性搭板的布置形式;通过现场调研和资料分析,给出了柔性搭板的合理设计参数参考值。基于模型的受力特点,提出了近似变形曲线的数学表达式,并将计算曲线与试验观测曲线进行了比较。结果表明,计算曲线与实测曲线基本吻合,能够反映真实的沉降情况。在此基础上推导出层间距的计算公式,并给出了设计参数的确定方法,为桥头柔性搭板的设计提供了参考依据。

Design Method of Flexible Approach Slab at Bridge Abutment

On the basis of analyzing the treatment mechanism of flexible approach slab at bridge abutment,conferring measured value from large scale settlement platform and the result of finite element simulation and topology optimization,the layout form of flexible approach slab at bridge abutment was given.By investigating at construction site and studying lots of data, authors gave the reasonable reference value of design parameters of flexible approach slab.Based on force characters of the model,authors put forward the mathematical expression of approximate deformation curves and compared calculation curves with measured curves.The result shows that calculation curves approximate to measured curves very much,so the curves calculated from mathematical expression can reflect the true settlement situation.Based on the result,authors deduced mathematical formula to calculate the distance from layer to layer and also gave the deterministic method for design parameters.All the work can provide reference base for the design method of flexible approach slab at bridge abutment.