免震構造応答に及ぼす上下動の効果

概要

論文の詳細を見る
Effects of vertical ground motions on structural response become more serious particularly in base-isolated structures. It is true because horizontal vibration is greatly reduced due to the presence of base-isolation, whereas vertical vibration remains the same compared to conventional structures. This paper presents a new modeling of base-isolated structures for the assessment of vertical motion effects. The major findings are: (1) the effect of vertical motion on the maximum lateral deformation of the base-isolation system as well as on the maximum story drift of the superstructure is minimal; (2) contribution of vertical motion to the axial forces exerted to base-isolated structures is significantly larger than the axial forces experienced in conventional structure; (3) beam vertical accelerations of the superstructure can be estimated reasonably by the analysis of vertical motion only; and (4) combined vertical and horizontal motion involves tension of the base-isolators when subjected to near-fault strong motions recorded in the 1995 Hyogoken-Nanbu earthquake.
一般社団法人日本建築学会の論文
2004-03-20