Seismic Vibration of Arch Dam with Tuned Liquid ColumnGas Damper (TLCGD)

Upgrading structural damping in civil engineering prone by Tuned Liquid Column Damper (TLCD)has been investigated during last decades extensively and control vibrations of some buildings andbridges with such dampers have been studied under wind or earthquake loadings as well. In thispaper, the idea of adding gas spring effect in TLCD to increase the range of the frequency is expandedto arch dams in order to upgrade the structural damping. This improvement is extremelyneeded for the retrofit of existing ancient dams that are not verified with the criteria of modernseismic civil engineering codes. The structural continuum of concrete dam body is idealized anddiscretized as an assemblage of finite elements. The dynamic analysis of a seismically activateddam with TLCGD is studied and the coupled modal equations considering one isolated structuralmode is derived By transferring into state space and following the optimization procedure, the optimalparameters of TLCGD are defined. The results show a proper decrease in displacements under the earthquake excitations

کلیدواژه ها:

Tuned Liquid Column Gas Damper ، Seismic Vibration ، Arch Dams