考虑流固动力相互作用的大型渡槽地震响应研究

SEISMIC RESPONSE OF LARGE-SCALE AQUEDUCT WITH FLUID-STRUCTURE COUPLING

根据符拉索夫及豪斯纳尔理论建立考虑槽内水体与渡槽槽身流固耦合的渡槽薄壁结构空间地震响应计算模型,该模型综合考虑了渡槽横向、竖向、纵向、自由扭转变形、约束扭转变形以及槽内水体对槽身的流-固动力相互作用等。由能量变分原理推导给出了渡槽薄壁梁段单元刚度矩阵及质量矩阵,按粘滞阻尼假设建立了渡槽结构阻尼矩阵。利用该模型对南水北调中线水利工程某大型渡槽进行了多工况地震时程响应计算。计算结果说明在地震作用下,渡槽槽内水质量对渡槽的横向地震响应有较大影响,在大型渡槽抗震设计计算时应予以重视。本文模型计算简单易行,是考虑槽内水体流固耦合作用的渡槽薄壁结构实用的地震响应计算模型,计算结果可为大型渡槽的抗震设计提供参考。

Based on the theory of Volasov and Housner, a shell aqueduct seismic response model with fluid-structure coupling is established. The transverse, vertical, and longitudinal structural deformation and restraint twist, as well as coupling between the aqueduct and the water body are considered. The element stiffness and mass matrices of the aqueduct are derived by using the energy principle. According to the viscosity damping hypothesis, the damping matrix is established. The seismic responses of a large-scale aqueduct in several operation cases are calculated. It is shown that the transverse seismic response is greetly influenced by the water mass in the aqueduct, deser ving attention in the anti-seismic design of the aqveduct. The model in this paper is simple and practical for the seismic response analysis of aqueduct with fluid-structure coupling, and the calculation results provide references to the anti-seismic design of aqueducts.