SEISMIC PERFORMANCE OF SRC COLUMN WITH CONCRETE FILLED TUBE AT CORE

Abstract

 This paper presents the development of a new seismic resistant column concept that could avoid the collapse of the column under the beyond-design expectations with anti-catastrophe concept. The new seismic resistant column is a steel reinforced concrete column that has a concrete filled steel tube at its core in addition to the conventional reinforced concrete section. In order to validate this new proposed concept, an experimental investigation was conducted. Two scaled model columns, a conventional reinforced concrete column and a new proposed steel reinforced concrete column, were constructed for cyclic loading tests as well as a concrete filled steel tube column itself which is located at core of the new proposed column. To investigate an effectiveness of the core steel tube, the flexural capacity, ductility and damage of columns were compared between the new seismic resistant column and the conventional column. A series of experiments confirmed that a steel tube placed at core of the section could increase the flexural capacity and the ductility of a reinforced concrete column. However, the steel tube at core did not contribute to reduce the residual displacement of a column as compared with the conventional reinforced concrete column subjected to large deformation.