In 1996, the seismic upgrade of existing structure was undertaken along with other major renovations. The conventional seismic upgrade schemes required expensive and time-consuming work on foundations. Supplemental damping in conjunction with appropriate stiffness was considered to be the best solution for this structure. Nonlinear time-history dynamic analysis was used to simulate actual building performance and to give realistic design forces. The use of Pall Friction Dampers significantly reduced the forces exerted and lateral deflections. Therefore, the strengthening of existing members was minimized and the strengthening of foundations was avoided. The chosen scheme provided significant saving in both construction cost and construction time.
展开▼
