Abstract
The standard requirements for transverse steel reinforcement (TSR) confinement in reinforced-concrete (RC) columns are mainly to provide the following: ductile behavior, minimum axial load capacity of the column’s core, and prevention of longitudinal bars buckling. It is well-known that the passive confinement due the TSR action is less effective in high-strength concrete (HSC) compared to normal-strength concrete (NSC). Therefore, the TSR amounts required by the standards for HSC columns are high, and in some cases, especially in the lower stories columns of high-rise buildings, are impractical. This paper presents a new construction method using textile-reinforced concrete (TRC) as internal confinement together with reduced TSR amounts. Moreover, comparison of the proposed method with RC columns casted in fiber-reinforced polymer (FRP) stay-in-place forms as additional external confinement, is presented. Eleven large-scale column specimens were tested under axial compression. The results give an insight on the application feasibility of the proposed construction method. It is shown that the TRC-TSR dual internal confinement action can be an option to reduce the standard required TSR amounts while maintaining similar levels of ductile behavior.
Highlights
The use of high-strength concrete (HSC) for columns has the advantage of reducing their dimensions [1]
The present study provides in detail the experimental research study performed on eleven large-scale HSC circular column specimens subjected to axial compression loading
This is a result of the low actual maximum tensile strain reached by the textile-reinforced concrete (TRC) in all TRC-transverse steel reinforcement (TSR) confined specimens, e f u,a [e f u,a ≈ (0.3 − 0.6)e f u ≈ 0.005 − 0.01], compared to the high strains that can be reached by the TSR
Summary
The use of high-strength concrete (HSC) for columns has the advantage of reducing their dimensions [1]. The application of HSC for columns in the lower stories of high-rise buildings is a superior choice for contractors; the brittle behavior of the columns, especially those with high axial load levels, results in a high amount of the required transverse steel reinforcement (TSR) to provide the high level of passive confinement [2,3,4]. This confinement is crucial to provide the column the minimum level of ductility. The specimens include three different confinement configurations with similar confinement levels: conventional TSR, stay-in-place FRP-TSR, and TRC-TSR
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
