某泄洪水闸上部结构动力响应分析

大量震害表明水闸上部结构是地震作用下易发破坏部位,然而规范并未对其抗震性能作专门要求,众多水闸设计中并未将上部结构与主体结构作为整体分析。以西北某水闸为例,采用动力时程法分别计算了水闸整体结构、下部主体及上部结构的动力响应,对比分析了各个结构的动力响应,探讨了上部结构与下部结构之间的相互作用。结果表明,相比于单独承受地震作用,上部结构和下部结构作为一个整体时,水闸会出现显著的鞭梢效应,且下部结构的地震能量会向上部转移。建议水闸设计时考虑上部结构的影响。

Dynamic Response Analysis of Sluice Superstructure

A large number of seismic damages have shown that the superstructure of sluice is fragile in earthquake. However, the specification does not specify its seismic performance. The superstructure is not considered as a whole with the major structure in the design of many sluices. Taking a sluice in the northeastern districts as an example and the dynamic time-history method was applied to calculate the whole structure of sluice, the individual major structure and the individual superstructure under earthquake load. The dynamic responses of different structures were compared with each other to discuss the interrelationship of the superstructure and the major structure. The results show that the whipping effect is notable when the superstructure and the major structure bear the seismic load together and the seismic energy shit upward from the major structure. So, it is recommended that the superstructure be taken into account in the design of sluice.