| Title |
Effects of Transverse Reinforcement on the Behavior of High-Strength Concrete Columns under Cyclic Flexure and Constant Axial Load |
| Authors |
황선경 ; 한병찬 ; 성수용 ; 윤현도 ; 정수영 |
| Keywords |
high-strength concrete ; tied columns ; transverse reinforcement ; ductility |
| Abstract |
This experimental investigation was conducted to examine the behavior of eight a third scale columns made of high-strength concrete(HSC). The columns were subjected to constant axial load corresponding to target value of 30% of the column axial load capacity and a cyclic horizontal load-inducing reversed bending moment. The variables studied in this research are the volumetric ratio of transverse reinforcement(ρs=1.58, 2.25%), tie configuration( hoop-type, cross-type, diagonal-type) and tie yield strength(fy=5,600, 7,950kgf/cm2).
Test results indicated that the flexural strength of all the columns did not exceed flexural capacities calculated based on the equivalent concrete stress block used in current design code. Columns with 42 percent higher amounts of transverse reinforement than that required by seismic provisions of ACI 318-99 were shown dutile behavior. When axial load is 30 percent of the axial load capacity of the column, the use of high-strength steel as transverse reinforcement may lead to equal or higher ductility than would be achieved with low-strength steel. |