Abstract
This paper presents behaviour of normal concrete, ultrahigh-strength concrete, engineered cementitious composite, lightweight concrete, self-consolidating concrete and crumb rubber concrete under confinement. Forty-six circular, square and rectangular concrete-filled steel tube columns with varying slenderness are tested under axial compression. Failure modes, axial load–displacement responses and stress–strain characteristics are analysed as well as concrete confined strengths are determined based on experimental results and existing models. The performance of existing confined strength models is evaluated and modified to accommodate different types of high-performance concretes and column shapes. The modified model improves the prediction of confined concrete strength with a mean predicted-to-experimental ratio of 1.05 as shape and concrete type factors are introduced.
Highlights
Concrete-filled steel tube (CFST) columns have been a topic of research for the past 40 years (Shanmugam and Lakshmi2001)
This paper presents the behaviour of normal concrete (NC) and new generation of self-consolidating high-performance concretes (HPCs) under steel tube confinement based on comprehensive experimental and theoretical investigations on CFST columns
Increase in axial strength of 14.5%, 6.4%, 9.6% and 8.7% for circular lightweight concrete (LWC), ultrahigh-strength concrete (UHSC), self-consolidating concrete (SCC) and crumb rubber concrete (CRC) columns, respectively, was observed when slenderness ratio increased from 3 to 9
Summary
Concrete-filled steel tube (CFST) columns have been a topic of research for the past 40 years (Shanmugam and Lakshmi2001). This paper presents the behaviour of NC and new generation of self-consolidating HPCs (such as UHSC, ECC, LWC, SCC and CRC) under steel tube confinement based on comprehensive experimental and theoretical investigations on CFST columns. The variables in CFSTs used in this research are: shape (circular, square and rectangular), slenderness ratio (height to diameter or height to minimum cross-sectional dimension), steel tube thickness and infill concrete types (six types—normal weight or lightweight, self-consolidating or not consolidating, with/without coarse aggregate and with or without fibre).
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