Study on Compressive Bearing Capacity of Full-Scale Square Concrete Columns Confined by High Strength Transverse Steels

Abstract

Experiments of axial compression were conducted using four full-scale reinforced concrete columns. One group of three columns used high-strength steel with the yield strength of 1000 MPa, and the second group used the ordinary strength steel with yield strength of 400 MPa for transverse steels. The performances between these two groups, specifically in bearing capacity and deformation ability, are discussed. Compared to the specimen with ordinary-strength steels, the bearing capacity of specimens with high-strength transverse steels increases 29% at most. The deformation ability increases about 2 times when the bearing capacity declines 50%. At peak confined concrete stress, the effectiveness of high-strength transverse steel depends on configuration and volumetric ratio of transverse steel. The better the concrete is confined, the higher the effectiveness of transverse steel. Five stress-strain models of confined concrete are used to calculate the bearing capacity of the specimens. Compared with experimental results, the calculation results show that the results calculated by the Razvi and Saatcioglu (1999) model agree with the experimental results well, as well as the stress in transverse steel at peak concrete stress.