パルス地震動に対する1自由度系最大応答理論解と応答特性

摘要

本研究では、内陸直下型地震の活断層近傍で予想されるパルス状rn地震動に対する基本応答特性を把握することを目的に、その基本形rnである正弦波パルス1波に対する弾性1自由度系の最大応答およびrn減衰特性を、時刻歴応答と最大応答値発生時刻理論解をもとに定式rn化し、応答特性について考察を加えた。本研究の結果をまとめて以rn下に示す。%It is suggested that the pulse-like ground motions, in the near-fault region, have great impact on the building seismic design. However, the theoretical study on the building response to the pulse-like ground motions input is not sufficiently clarified yet. In this study, the time at maximum response is theoretically evaluated as important factor. Based on that, the theoretical solutions of response spectra, with single-degree-of-freedom system subject to the sinusoidal pulse input, are performed. In addition, we suggested the damping-modification-factor, in accordance with the time at maximum response and the pulse wave period - building period relations.