DAMAGES TO LATTICE TYPE STEEL REINFORCED CONCRETE BUILDINGS AND STRENGTH AND DUCTILITY OF THE COLUMNS

Though no SRC buildings had been collapsed by the previous earthquakes in Japan, 32 SRC buildings were collapsed by 1995 Hyogoken-Nanbu earthquake. Those buildings had SRC columns in which open-web type steels were encased. Authors conducted loading tests of the columns in a damaged 6-story SRC building in Kobe and also conducted tests series of SRC columns to investigate the cause of the collapse and examined the strength and ductility of the SRC columns. Findings are the followings. ○!1Failure modes are critically influenced by the axial force caused by the overturning moment during earthquake. ○!2The loss of the steel section by the rivet hole does not affect the load deflection much. ○!3The ultimate strength of the SRC columns with not only full web steel but also with open web steel can well be estimated by the plastic theory using truss-arch mechanism