Influence of compressive load on concrete filled steel tubular column with variable thickness
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TECHNICAL PAPER
Influence of compressive load on concrete filled steel tubular column with variable thickness Dhiraj Ahiwale1 · Rushikesh Khartode1 · Akshay Bhapkar1 · Giridhar Narule1 · Kamalkishor Sharma1 Received: 3 July 2020 / Accepted: 12 October 2020 © Springer Nature Switzerland AG 2020
Abstract The concrete-filled tubular (CFT) structure consists of high strength, favourable ductility, fire resistance and huge energy absorption. The cost and time of construction can be reduced as there is no shuttering required for CFT columns. The confinement outcome of CFT column possesses higher stiffness as compared to hollow steel tube columns. In this article, testing is administered on twelve specimens of natural and artificial sand M25 grade CFT columns with a ratio of diameter to variable tube thickness (D/t of 27.72, 22.18 and 18.48). The twelve CFT columns have been tested under axial compression. The behaviour of CFT columns has been studied in terms of axial load-carrying capacity, deflection and buckling effects and compared the behaviour with numerical results determined using Eurocode 4 and AISC 360-10. The performance of CFT columns increased, as the thickness of tube increased with the effective confinement. The experimental and the numerical results of CFT columns have been validated by using ANSYS 14.5. The axial load-carrying capacity of an artificial sand CFT specimen has been improved significantly. Therefore, the natural sand could be replaced with artificial sand for CFT columns. Keywords CFT · Load-carrying capacities · Buckling · Eurocode 4 · AISC 360-10 · ANSYS
Introduction and literature review Concrete and steel are the foremost extensively used and consumed materials within the construction of building structures. The fashionable developments within the construction sector prove further inclination towards the development of RCC multi-story structures everywhere in the planet. The planning of such high-rise structures demands huge components, particularly columns resulting in the introduction of huge axial forces and moments. Due to continuous efforts of researchers, the CFT column is a highly developed system in the building of structures. However, CFT column sections like circular, rectangular, square, octagonal, polygonal and elliptical are widely used in the engineering structures. But there is more local buckling in square or rectangular CFT columns due to less confinement by steel tube and concrete when compared to circular CFT column [1–9]. * Dhiraj Ahiwale [email protected] 1
Vidya Pratishthan’s Kamalnayan Bajaj Institute of Engineering and Technology, Baramati, Pune 413133, India
Many researchers have studied the close behaviour of CFT column and suggested the design guidelines for analysis [4, 6, 7]. The concrete-filled tube columns also are called as composite columns which are extensive important parts in composite structures. A lot of research has been performed on the experimental and numerical investigation with the purpose to review the performance of concre
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