Computation of natural frequencies and mode shapes of arch dams as an inverse problem
- 建筑土木－会议论文 
In this paper, a procedure is developed which can be used to identify the natural frequencies and natural modes of an Arch-Dam in a vacuum, from forced vibration testing data of partially filled reservoir, throughout removing the effect of hydrodynamic, by using an effective algorithm. The resonance frequency and the resonance mode of the dam-reservoir system have been computed from the in situ tested data. The solution strategy is verified by studying the dynamic response of simple structures, like beam with the fluid interaction effect taken into account, as the analytical results of its modal properties were available for comparison. The hydrodynamic pressure of the reservoir is calculated using the boundary element method. In the inverse problem procedure, the calculated resonance replaces the measured resonance, which has been obtained practically throughout the in situ testing. In this paper the strategies are extended to analyse the dynamic beam-fluid interaction problem with compressible water. The results derived by solving an inverse problem are compared with the exact analytical responses of the beam. (C) 2000 Civil-Comp Ltd and Elsevier Science Ltd. All rights reserved.