PROPOSAL OF RESPONSE CONTROLLED STRUCTURAL SYSTEM OFCONNECTED HIGH-RISE BUILDINGS WITH CONCENTRATEDDAMPERS AT BASE

摘要

Structural control systems with dampers, which are placed within frames, are effective inpreventing damage on a structure due to intense seismic actions. However, in the usual structuralcontrol systems with dampers, certain restrictions on architectural planning are inevitable as it isnecessary to keep appropriate distribution of many dampers for providing effective deformationin them, in order to achieve excellent seismic performance by remarkable reduction of story drift.The authors propose a new structural control system with dampers for high-rise buildings wheretwo different types of structures, one is a base isolated structure and another is an ordinaryearthquake resistant structure, are connected to each other at the top story. In this new structuralcontrol system, it is not necessary to install dampers at typical floors and suited to the design ofmultifunctional high-rise buildings. Natural periods of each of two building structures, amountof the dampers in the isolation story, mass ratio of the base isolated structure, etc. are theimportant parameters in this new structural control system.A series of time-history seismic response analyses for various combinations of the parametersare carried out and it is concluded that this new structural control system can provide excellentseismic performance as the isolated story positively absorbs seismic input energy.