1階柱を屋内側に拡張したRCピロティ柱梁接合部の解析モデル 接合部が開く方向に関する検討

摘要

A model is presented for pushover analysis of reinforced concrete soft-first-story frames with columns extended toward inside of frames. The model includes a rotational spring of first-story column and that of beam. The beam spring represents the flexural resistance of the section which includes the beam and the second-story column. The yield deformation of each spring is determined based on the observed strain distribution of the longitudinal bars. The proposed model agreed with the test results much better than the conventional model, which provided up to twice of the observed strength and a half of the observed yield deformation.%1995年の兵庫県南部地震において，上層部に壁が多く，最下階で壁を有しないRCピロティ構造に甚大な被害がもたらされた。これを受けて，我が国ではF_s指標に関する規定が強化された。さらに，構造関係技術基準解説書では，最下階にも部分的に耐震壁を配置し，層崩壊を許容しない構造計画を推奨している。