CAUSE OF THE COLLAPSE OF LATTICE TYPE STEEL ENCASED REINFORCED CONCRETE BUILDINGS DUE TO 1995 HYOGO-KEN NANBU EARTHQUAKE AND DUCTILITY OF THOSE BUILDINGS

Abstract

Considerable number of lattice type steel encased reinforced concrete (SRC) buildings were collapsed due to 1995 HYOGO-KEN NANBU earthquake. The ductility of the member is increased by the encased steel. However, the amounts of latticed steel and hoop of the collapsed buildings were considerably less than those of the specimens in literatures. The merits of SRC structure were not fully developed in those buildings. The ductility of lattice type SRC columns is highly affected by axial force and margin of shear strength. Experimental formulae to predict the limit deformation of lattice type SRC columns are presented based on the past experimental data.