抄録
Relatively high rise buildings are often constructed using steel encased reinforced concrete (SRO members. The deformation capacity of the building is a key factor to avoid the collapse of the building. In Japanese regulation, this contribution is counted as Ds-value. However, the research works to estimate D* value of SRC buildings are rare. In this paper, data of ultimate deformation angles of SRC members are examined and D= values of SRC buildings are estimated modifying Prof. Akiyama's proposal which takes account of energy input of an earthquake and energy concentration in a multi-story building. A cycle of repetition with the amplitude of limit deformation during earthquake is assumed to follow the proposal. Key parameters such as axial force ratio, steel strength ratio and shear strength ratio of beams or columns are presented to satisfy each D* value of a SRC building. Calculated results are examined comparing with the damages of the SRC buildings which experienced Hyogoken-Nanbu earthquake.
