Title: Ductility Improvement of High-Strength Concrete Columns With Lateral Confinement
Author(s): H. Muguruma and F. Watanabe
Publication: Symposium Paper
Appears on pages(s): 47-60
Keywords: columns (supports); confined concrete; ductility; high-strength concretes; lateral pressure; models; structural analysis; stress-strain relationships; tests; Structural Research
The object of this study is to investigate the possibility of improving ductility of high-strength concrete columns with the lateral reinforcement. Eight column specimens confined by lateral reinforcements having 328.4 and 792.3 MPa in yield strength were tested under reversed cyclic lateral loads with constant axial compressive load levels from 0.254 to 0.629. The concrete compressive strengths were 85.7 and 115.8 MPa, respectively. Volumetric ratio of lateral reinforcement was 1.6 percent in all specimens. Test results indicated that the very large ductility could be achieved by using high yield strength lateral reinforcement, even for such high-strength concrete columns. Modifications of previously proposed stress-strain models on confined concrete were also made for applying them extensively into the calculation of moment-section curvature relationships of high-strength concrete columns with lateral confining reinforcement.