Observed records and dynamic analysis of a base-isolated building for hyogo-ken nambu earthquake

摘要

Analytical investigations for seismic response records observed on a base-isolated building during Hyogo-ken Nambu Earthquake in 1995 are operated in detail. The base-isolated building has been located on about 35 km of distance from the epicenter. By processing observed response records of the base-isolated building, the estimations for the following two items are emphasized: 1) rotational behaviors such as rocking response and torsional response, 2) veritical deformations of base-isolators. To examine accordance of the structural parameter of the base-isolated building on the initial design, numerical analyses are executed. Both horizontal and vertical seismic behaviors are estimated. Through considerations for the observed records and the numerical results, it is assured that rotational response of the base-isolated building are very small. Moreover, it is found that veritical axial force of base-isolators may be evaluated by verifying observed records from comparison with numerical results.