Fluid-structure models for dynamic studies of dam-water systems

摘要

The performance of four different dam-reservoir finite element models, suitable fordirect time domain analysis of the earthquake response of concrete gravity dams including dynamicfluid-structure interaction is investigated. Namely, these models, M1 to M4, are respectively: 1) thestandard rigid dam-incompressible water model, 2) the flexible dam-incompressible water model,3) the rigid dam-compressible water model and 4) the flexible dam-compressible water model.First, the discrete system of finite element equations resulting from a Galerkin variational formulationof the governing equations of the pressure and displacement fields are established for eachmodel. Then, the distribution of the dynamic pressure coefficient at the upstream face of a typicalconcrete gravity dam and the hydrodynamic pressure time histories at its base, derived from the applicationof the four fluid-structure models have been determined. In addition, conclusions of engineeringsignificance on the relative performance of the four mathematical models are given.