EXPERIMENTAL STUDY ON AXIAL BEHAVIOR OF CIRCULAR CFRP-STEEL COMPOSITE TUBE CONFINED CONCRETE STUB COLUMNS

CFRP material has many advantages such as high strength, light weight, good durability and corrosion resistance, but the construction procedure of concrete columns confined by CFRP tube is rather complicated, leading to relatively high cost. Instead, CFRP can be utilized to strengthen steel tube confined concrete columns, in which steel tubes serve as the formwork for the construction of CFRP. Therefore, CFRP-steel tube confined concrete columns are very suitable for concrete structures because of their excellent mechanical properties and convenient construction. In this paper, the behavior of circular CFRP-steel tube confined concrete stub columns subjected to axial compression was investigated through experimental study. Associated methods for calculating the ultimate loading capacity of circular CFRP-steel tube confined concrete stub column were compared and recommended for practical design.