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Effect of diameter on fire exposed concrete-filled double skin steel tubular (CFDST) columns under concentric axial loads

Mohd Zuki, Sharifah Salwa and Choong, Kok Keong and Jayaprakash, J. and Shahidan, Shahiron (2015) Effect of diameter on fire exposed concrete-filled double skin steel tubular (CFDST) columns under concentric axial loads. In: AWAM International Conference on Civil Engineering 2015 (eco-AICCE 2015), 9-11 September 2015, Kuala Lumpur, Malaysia.

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Abstract

Concrete-filled double skin steel tubular (CFDST) columns with three different diameters were exposed to fire following ASTM E-119 fire curve. The temperature was kept constant for 60 minutes after reaching 600°C. After the cooling down process, the columns were tested under concentric axial load condition until failure. Maximum loads, displacement and strain were recorded during testing. Failure patterns were observed. In this paper, failure patterns, increment or reduction of residual strength, ductility and stiffness are reported and discussed in details. All tested CFDST columns failed by local buckling and crushing of concrete. As expected, residual strength index (RSI) decreased with increased fire exposure time. Whereas, larger diameter heated specimen retain more than 50% of it corresponding room temperature secant stiffness. In addition, ductility index (DI) of larger diameter specimen shows an enhancement after fire exposure. Highest enhancement in DI was observed in 90 minutes fire exposure.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: concrete-filled double skin steel tubular (CFDST) columns; fire exposed CFDST columns, residual strength; concentric axial load; ASTM E-119 standard fire curve
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA630-695 Structural engineering (General)
Divisions: Faculty of Civil and Environmental Engineering > Department of Structural and Material Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 25 Oct 2015 06:53
Last Modified: 25 Oct 2015 06:53
URI: http://eprints.uthm.edu.my/id/eprint/7271
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