Temperature effect on behavior of structural light weight concrete filled steel tube (LWCFST) column
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(2020) 5:6
RESEARCH ARTICLE
Temperature effect on behavior of structural light weight concrete filled steel tube (LWCFST) column Pramod B. Salgar1 · Pandurang Shankar Patil1 Received: 14 September 2019 / Accepted: 18 December 2019 © Springer Nature Switzerland AG 2020
Abstract Expanded clay lightweight aggregates (Sintagg) are more light weight aggregate made by heating clay to around 1200 °C (2190 °F) in a rotary kiln. The structural light weight concrete of M40 grade was developed by using Sintagg aggregates, which used to fill in steel tubes columns (circular, square, and rectangular). This paper investigated the effect of temperature variations (600–1000 °C) on structural behavior of LWCFST column under axial loading and research findings about load deflection behavior, failure patterns, comparison of experimental and numerical fire resistance load (EN 1994-1-2:2005– Annex G) and temperature effect on bond stress of LWCFST. The results shows that LWCFST has a good fire resistant capacity and bond stress value after exposure to temperature variations, with 25.30% reduction in dead weight of column than normal concrete filled column. Keywords Sintagg · High strength light weight concrete (LWC) · Concrete filled steel tube column (LWCFST) · Temperature variations · Fire resistance · Bond stress
1 Introduction The structural light weight concrete filled steel tube (LWCFST) column system has many advantages compared with the regular steel or the reinforced concrete system. Interaction between the steel tube and light weight concrete is the one of the main advantage; local buckling of the steel tube is deferred by the restraint of the concrete, and the compressive strength of concrete is increased by the confine effect of the steel tube. The steel tube in a light weight concrete filled tubular column (LWCFST) acts as both longitudinal and tangential reinforcement, and is thus subjected to biaxial stress [1]. Since the structural light weight concrete reduces the dead weight of column it provides economical sections in framed high rise structures. The structural performance of such structural light weight concrete filled steel * Pramod B. Salgar [email protected] Pandurang Shankar Patil [email protected] 1
Civil Engineering Department, K.E. Society’s, Rajarambapu Institute of Technology Rajaramnagar, (Autonomous Institute Affiliated with Shivaji University), Dist. Sangli, Sakharale, Islampur 415414, Maharashtra, India
tube (LWCFST) column is very efficient compare to normal concrete filled steel tube column. Another benefit is to attain the required period of fire resistance without the need of applying external fire protection [2, 3]. This study illustrate experimental and numerical results from investigations of fire resistance and bond stress of concrete-filled square, rectangular and circular steel tube columns which have undergone the temperature variation from 600 to 1000 °C and results were considered for comparison of LWCFST specimens with similar parameters for without temperatur
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