地震作用下桥梁结构-水相互作用分析

Analysis of Structure-Water Interaction for Bridges under Earthquake Excitation

采用动水附加质量的方法计算地震作用下深水高桩承台体系桥梁的结构-水相互作用。采用附加质量和阻尼系数矩阵的解析解来求解承台上的动水力;单桩的附加质量采用莫里森方程求解,并用群桩系数修正群桩体系中各单桩的附加质量。最后通过一个实桥的算例阐述了考虑结构-水相互作用的动水效应计算方法。

The structure-water interaction of elevated pile cap bridge under earthquake action was studied in this paper. Added mass approach was adopted to account for the hydrodynamic effects due to earthquakes. The hydrodynamic added masses of pile caps were calculated by the concise closed form expressions. Morison Equation was applied to calculate the added mass of a single pile. Grouping effect of piles was considered by correcting the single pile＇ s calculated hydrodynamic added mass with grouping effect coefficient. Finally, the calculation method with structure-water interaction was discussed with an example of bridge.