隣立する高層建築物の地震動下における安全な棟間距離の評価

Estimation of Secured Distance between Neighboring High-Rise Buildings under Seismic Motion

Abstract


2011年東北地方太平洋沖地震では、震源から離れた東京都内において長周期地震動が観測され、高層建築物が大きく揺れた例が報告されている。また、高さの異なる建物同士は固有周期の相違により異なる揺れ方をするため、衝突する恐れがある。本研究では、高さの異なる2棟の隣立する建物について、ASI-Gauss法を用いた地震崩壊解析コードにより衝突解析を行うことで、棟間衝突の危険性を示し、安全な棟間距離について検討した。


There lies a risk of seismic pounding when the distance between neighboring buildings is not enough, because high-rise buildings may greatly shake under long-period ground motion. In this study, seismic pounding analyses are performed on two neighboring buildings with different heights under long-period ground motion. Secured distance between them are estimated by adding elastic deformation limit and allowable plastic deformation limit. Additionally, the damage level is compared by the ratio of elements which became plastic in all columns and beams. Consequently, the ratio increased as the distance between the buildings shortened. Furthermore, a particularly strong tendency of the distance to damage was seen in the lower-story building.


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