Abstract: In this paper, the equation of horizontal applied force which floodwater acts on the bridge constructure is obtained by the momentum equation and the energy equation when the bridge upper constructure is submerged partly or completely by floodwater,and it has been tested and verified by hydraulicmodel test.

Key words: the bridge constructure, hydraulic model test, horizontal applied force

摘要： 本文通过动量方程及能量方程导出了在洪水期间当桥梁上部结构部分或全部被洪水淹没时桥梁结构（主要指上部结构）的水平受力计算式，并通过了水工模型试验验证．

关键词: 桥梁结构, 模型试验, 水平作用力