Abstract
In general, the lateral confinement capacity of RC columns is influenced by the strength and configuration of transverse reinforcement. In this study, performed antisymmetric flexural moment experiments that simulated seismic loads, with the configuration and yield strength of the transverse reinforcement of RC square columns as main variables. The eight specimens were square cross-sections measuring 250 × 250 mm, and the lateral confinement effect in relation to main variables was examined by inducing flexural failure in the plastic hinge zone under a shear span-to-depth ratio (a/D) of 3.0. Transverse reinforcements comprised a square and octagonal S-series and tie-based H-series. The yield strengths of the transverse reinforcements were 453 MPa and 1053 MPa, respectively. Compared to the H-series, the S-series, whose configuration of transverse reinforcement is closer to a circular form, exhibited more prominent ductile behavior after flexural yield with increasing yield strength of transverse reinforcement, which indicates greater lateral confinement.
Highlights
RC members designed to undergo flexural failure will develop a plastic hinge at the critical section, located away from the end of a member by a length corresponding to the effective depth (d), when the longitudinal reinforcement experiences flexural yield under repeated loads like seismic loads
Flexural RC members, exhibit ductile behavior through moment redistribution after plastic hinge formation [1,2,3]. They may not engage in ductile behavior if concrete undergoes compressive failure due to insufficient lateral confinement at the critical section, located away from the end by a length corresponding to the effective depth (d)
The ductile behavior of RC columns, which are subject to axial force, is dominantly influenced by the lateral confinement effect of concrete near the plastic hinge zone
Summary
RC members designed to undergo flexural failure will develop a plastic hinge at the critical section, located away from the end of a member by a length corresponding to the effective depth (d), when the longitudinal reinforcement experiences flexural yield under repeated loads like seismic loads. Flexural RC members, exhibit ductile behavior through moment redistribution after plastic hinge formation [1,2,3] They may not engage in ductile behavior if concrete undergoes compressive failure due to insufficient lateral confinement at the critical section, located away from the end by a length corresponding to the effective depth (d). This study presents the results of performed experiments with the configuration of transverse reinforcement, yield strength of transverse reinforcement, and axial force ratio as main variables to assess the lateral confinement performance of spiral transverse reinforcement, comprised of alternating squares and octagons, designed to be close to a circular shape. Based on the experimental results, the effects of yield strength and reinforcement configuration on lateral confinement were evaluated, and the relationship between main variables and ductile behavior was examined
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