Evaluation of bond capacity of reinforced concrete columns with U-shaped transverse reinforcement

Abstract

This paper presents the bond performance of reinforced concrete (RC) columns according to the confinement conditions of the longitudinal reinforcement. This study is carried out to evaluate the bond capacity of RC columns subjected to reversed cyclic antisymmetric moment under seismic load. The main parameters are the confinement conditions of the longitudinal reinforcement and the axial force ratio of the specimens. The overall performance of each specimen is examined in the shear force verse drift angle relationships and the crack patterns of the specimens. An analytical approach which can consider the bond strength of the longitudinal reinforcement is also used to predict the failure mode and the shear strength of the specimens. Experimental results showed that the bond strength of specimens is not affected by the axial force ratio. Furthermore, it can be found that the confinement of inner longitudinal reinforcement effectively increases the bond strength of RC columns by controlling the bond cracks.

Keywords:

• RC column
• bond
• configuration
• transverse reinforcement

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Priority Research Centers Programme [grant number 2012-0006682] and Basic Science Research Programme [grant number 2012R1A1A2039067] through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology. This research was also financially supported by the Human Resources Development programme [grant number 20114010203040] of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.