AN INNOVATIVE APPLICATION OF DAMPING DEVICES IN SEISMIC UPGRADE OF A WATER RESERVOIR

摘要

Seismic rehabilitation of a critical water storage facility by means of passive seismic energy dissipation devices - dampers has been presented in the paper. The reservoir considered is a concrete flat slab structure over twenty years old located in a park area of Burnaby, British Columbia, Canada. Due to inadequate strength of critical structural elements, the existing structure would possibly demonstrate excessively large lateral displacements and might experience a non-ductile failure at a significantly less than the design level earthquake. A feasible way of upgrading the deficient reservoir structure is by means of seismic dampers, which are used with an objective to enhance energy dissipation potential of the existing non-ductile structure. A possible layout and installation of damper units has been presented in the paper. Effectiveness of viscous and friction dampers has been evaluated by means of 2-D and 3-D dynamic time history analyses. The following results of the dynamic analysis have been discussed: acceleration and displacement response, the effectiveness of linear versus nonlinear viscous dampers, and the effect of recorded versus artificial earthquake time histories used in the analysis.