水体晃荡作用对渡槽横向抗震影响的研究

本文建立考虑槽内水体与渡槽槽身流固耦合的横向地震响应计算模型,分析槽内水体晃荡对渡槽结构横向抗震的影响,并对某大型渡槽进行多工况地震时程响应计算。计算结果表明:在地震作用下,渡槽槽内大质量水体对渡槽的横向地震响应有较大的影响,但水体的晃荡作用减小水体自身的地震反应,若将水体视为刚体,质量全部附加到槽体上,将严重地夸大水的地震惯性力作用;在渡槽槽身断面选择时应考虑槽身分厢对墩身抗震的影响,以减小地震力。

Research on influence of water shake acting on aqueduct transverse seismic response

The transverse seismic response of beam aqueduct with considering fluid-structure coupling is established in this paper.With the variety of aqueduct body disposal,the aqueduct transverse seismic response of a large-scale aqueduct under several work conditions is computed.The results show that the transverse seismic response is greatly influenced by the water mass in the aqueduct,but the shake water reduces itself seismic response.If the whole water is appended to aqueduct body,it will magnify the seismic inertia action.When the aqueduct cross-section is selected,the influence of seismic response of aqueduct body on pier should be considered in order to reduce seismic damage.