考虑槽身与槽内水体流固耦合的渡槽地震反应计算

Seismic response analysis of aqueducts with consideration of fluid-solid coupling

基于考虑槽身与槽内水体流固耦合的渡槽薄壁梁段单元的动力分析模型,计算了南水北调中线工程某渡槽结构的地震反应.计算结果表明,随着水位的上升,渡槽结构地震反应增大;考虑槽身与槽内水体流固耦合时,渡槽结构的横向地震反应、伸缩缝相对折角小于不考虑流固耦合的情况,而槽身横截面绕轴线转角却大于不考虑流固耦合的情况,说明槽身与水体的相互耦合对渡槽结构地震反应影响显著.因此,在对渡槽结构进行地震反应计算时,应采用能考虑相应水位的渡槽流固耦合动力分析模型,并计算渡槽在不同地震波激振下的地震反应才能综合反映渡槽结构在地震作用下的实际情况.

Based on the shell-beam element dynamic model for aqueducts with consideration of the fluid-solid coupling, the seismic response of an aqueduct structure in the South-to-North Water Transfer Middle Line Project was calculated. The results indicate that seismic response of the aqueduct structure grows with the rise of water level,and that the transverse seismic response and the relative rotation of expansion joints decrease, but the rotation angle of the aqueduct section around the longitudinal axis increases when the fluid-solid coupling is taken into account. Therefore, the fluid-solid coupling is of great influences on the seismic response of the aqueduct structure. As a result, it is proposed that the fluid-solid coupling dynamic model with different water levels considered should be used in the calculation of the seismic response, and that the seismic response of aqueducts under different shock waves should be calculated for comprehensive reflection of the behavior of aqueducts in actual earthquakes.