Structural design & Design method

[2007] EXPERIMENT ON BUCKLING BEHAVIOR OF ULTRA-HIGH STRENGTH REBARS IN RC COLUMN

Aixin ZHOU¹, Yuping SUN², Takashi TAKEUCHI², Pengjun LUO³ (1.Kobe University, 2.神戸大学, 3.Southwest Jiaotong University)

Keywords:Buckling、Compression、RC column、RC柱、Slenderness ratio、Ultra-high strength rebar、圧縮、座屈、細長比、超高強度鉄筋

Twelve square columns reinforced by SD345 or SBPDN rebars were tested under axially compressive load to investigate the buckling behavior of ordinary and ultra-high strength rebars in reinforced concrete (RC) columns. Test results indicated that the slenderness ratio of 8 is sufficient to prevent premature buckling of SD345 rebars. Whereas, the SBPDN rebars may buckle before yielding even the slenderness ratio was as small as 4. This fact implies that stronger lateral restraint is required to achieve satisfactory post yielding behavior of ultra-high strength rebars.