【摘要】 为分析南水北调水利工程某渡槽的结构动力性能，以便对工程设计提供有力支持，采用８结点空间块体单元对渡槽进行有限元离散．借助ＳＡＰ９３有限元分析软件，对该渡槽进行４种工况（槽内无水、槽内有水、渡槽无伸缩缝、渡槽有伸缩缝）下的模态分析及地震荷载作用下的动力响应时程计算．结果表明：在无水情况下，无伸缩缝时的各阶频率均大于有伸缩缝时对应的各阶频率；在渡槽有水情况下也有同样的结果．对于具有相同结构的渡槽，无水时的各阶频率均大于有水时相应的各阶频率更多还原

【Abstract】 In order to analyse the structural dynamic property of aqueduct and provide a powerful support for engineering designs.Eight node dimensional brick elements are used to divide the aqueduct.By utilizing finite element method software SAP 93,the modals under several conditions(aqueduct without water,aqueduct with water,aqueduct without extension commissures,aqueduct with extension commissures)are analysed and the dynamic response of one of aqueducts in the projects for diverting water from south to north in earthquake is calculated.The results show that every frequency of the aqueduct without extension commisure is bigger than that of a queduct with extension commissures in the case of aqueduct without water.It also gets the same results in the case of aqueduct with water.To the aquededucts with the same structure,every frequency of aqueduct without water is bigger than that of aqueduct with water .更多还原