杭基礎で支持された曲げ降伏型連層耐震壁の地震時抵抗機構:その1　実験試験体を用いた検証とモデル化

摘要

Reinforced concrete multi-story structural walls supported on pile foundations are commonly designed assuming that they stand on solid foundation without considering their interaction. In this paper, two specimens were tested to simulate their seismic force resisting mechanisms. They consisted of the lowest three floors of structural wall, the first floor slab, a foundation beam and the part of piles. Flexural-shear cracks formed in the structural wall developed to the foundation beam, and the part of the structural wall, the foundation beam and the compressive pile made a solid assemblage rotated about the lower flexural compressive region of the foundation beam. Proposed macro model focusing on the dominant flexural-shear crack made it possible to distinguish fracture modes and to simulate lateral load-deformation angle relationship of the specimens with good accuracy.%杭基礎に支持された構造物では，上部構造から杭基礎を介して地rn盤へと伝達される地震時水平力の経路を明らかにすることが，耐震rn設計を合理的に行う上で重要である。本研究では，中高層集合住宅rnを中心に広く普及しているRC進達層耐震壁を杭基礎で支持する構rn造形式を対象とし，上部構造と杭基礎の境界部にあたる基礎梁周辺rnに着目して，地震時抵抗機構の解明を試みる。