TORSIONAL RESPONSE OF A BASE ISOLATED LARGE BUILDING(Structures)

Abstract

This paper reports seismic observation of a base isolated large building in terms of torsional vibration. The building is 8F/B2F with 90m length, 30m width, and 40m high. The isolate equipments are placed between B1F and B2F. Acceleration records and in-story deformations are measured at both ends of the building in longitudinal direction. The recorded data of Chiba-kenn-hokuseibu earthquake on 28^<th> of July 2005 showed some torsional response vibration caused by eccentricity of the building and the difference of input motions at both side. Results of a simple analytical model showed good agreements with observed records.