原型振动测试表明，在高速泄洪水流作用下，部分泄流结构（如拱坝、泄洪闸闸墩、导墙等）的泄洪振动响应出现了"阵发、冲击型"的振动，其实测响应时程线的波形包络线随时间有大幅增加或减小，表现出"拍振"的形式，且部分工程的振幅较大，已影响泄流结构泄洪安全，国内外关于这类振动形式形成的内在机理研究较为少见。本项目拟结合国内曾出现拍振的二滩拱坝、蜀河水电站泄洪闸闸墩等实际工程，研究高速泄洪水流诱发泄流结构拍振的机理与形成机制，研究基于现代时-频的泄流结构拍振响应、水动力荷载等时频特征参数提取方法，揭示水流荷载作用下结构响应中出现"拍"现象与"结构固有动力特性-水动力荷载能量-时间-频率"之间的关系，确定拍振的形成条件，进一步完善泄流诱发结构振动机理研究；研究泄流结构拍振对结构自身安全及人体危害评估方法，建立泄流结构振动响应安全控制指标；研究成果对保障泄流结构的泄洪安全具有重要意义。

Prototype vibration tests show that part of vibration resopnse of the flood discharge structure (such as arch dam, sluice pier and guide wall) appear intermittency and shocked vibration type under high speed flood discharge excitation. The measured envelope of the response schedule lines increases or decreases with time,and exhibits "beat vibration" form. This vibration form has affected the safety of flood discharge structure because of the large vibration amplitude. The study about the beat vibration formation mechanism is rare at home and abroad. This project takes Ertan arch dam and Shuhe sluice pier as example which appeared beat vibration, studies the formation mechanism of flood discharge structure beat vibration induced by high speed flood flow, studies the time-frequency characteristics of structural beat vibration response and hydrodynamic loads extraction method based on modern time-frequency singal processing method, reveals the relationship between "beat" phenomenon and "structure inherent dynamic characteristics-energy of hydrodynamic loads-time-frequency", determines the formation conditions of beat vibration, and then perfects the mechanism of flow induced vibration. This project also studies structure safety and human hazard evaluation method, establishes beat vibration security control indicator. The study results have important implication for the flood discharge structure safety during flood discharge.