【摘要】 鉴于厂房结构在地震作用下可能出现的严重后果,地震时动水压力对厂房结构的振动特性的影响就成为厂房结构设计的一个重要控制因素。结合某河床式水电站厂房实际工程,以有限元软件ANSYS为平台,建立三维有限元模型,分析地震动水压力对其振动特性的影响。分析结果表明:地震动水压力作用增加了坝面附加质量,从而降低了厂房的自振频率,并且对振型产生了一定的影响,尤其是进水口闸墩、尾水管闸墩等局部振型变化,因此对其作用下的厂房自振频率进行分析显得极为必要;随着上游水位的降低,厂房整体质量减小了,地震动水压力作用下的厂房自振频率随之增大,不同水位下厂房振型明显有所改变。更多还原

【Abstract】 In view of the possible serious consequence of hydropower structure under seismic action,the influence of dynamic water pressure produced by seismic on the vibration characteristics of hydropower structure has become an important control factor of hydropower structure design. Combining with practical powerhouse engineering of a riverbed-hydropower station,the paper used ANSYS as a platform to establish three-dimensional finite element model and analyze the influence of seismic dynamic water pressure on the vibration characteristics of hydropower structure. The results shows that seismic dynamic water pressure increases the added mass of dam surface,and then reduces the vibration frequency of powerhouse itself,and has certain influence on vibration mode,especially the local vibration mode changes of water inlet gate pier and draft tube gate pier etc. So it is necessary to analyze the frequency of natural vibration under the effect of seismic dynamic water pressure; with the reduction of upstream water level,the overall quality of hydropower is decreased and the frequency of natural vibration of hydropower under the action of seismic dynamic water pressure is increasing. The vibration modes of powerhouse under different water levels are obviously changed.更多还原