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Experimental study of two-way post-tensioned flat slabs in fire

Li Zhang (Department of Civil Engineering, The University of Hong Kong, Hong Kong, China)
Ya Wei (Department of Civil Engineering, The University of Hong Kong, Hong Kong, China)
Francis Tat Kwong Au (Department of Civil Engineering, The University of Hong Kong, Hong Kong, China)
Jing Li (South China University of Technology, Guangzhou, China)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Article publication date: 19 September 2017

Issue publication date: 11 October 2018

212

Abstract

Purpose

This study aims to investigate the influence of tendon layout, pre-stressing force, bond condition and concrete spalling on the structural behaviour of two-way post-tensioned flat slabs at elevated temperatures.

Design/methodology/approach

Fire tests of four scale specimens of two-way post-tensioned concrete flat slabs were performed and analysed. Three of them were provided with bonded tendons, while the other was unbonded for comparison. The fabrication of specimens, phenomena observed during testing, temperature distributions, deflections and occurrence of concrete spalling were examined.

Findings

Different degrees of concrete spalling observed at the soffit had significant effects on the temperature distribution and stress redistribution. This was the major reason for the progressive concrete spalling observed, resulting in loss of structural integrity and stiffness.

Originality/value

The structural behaviour of two-way post-tensioned concrete flat slabs at elevated temperatures is less understood compared to their one-way counterparts. Therefore, the present study has focused on the structural behaviour of two-way post-tensioned concrete flat slabs with bonded tendons in fire, a field in which relatively little information on experimental work can be found.

Keywords

Acknowledgements

The work described here has been supported by the Research Grants Council (RGC) of Hong Kong Special Administrative Region, China (RGC Project No.: HKU 710012E) and the State Key Laboratory of Subtropical Building Science of South China University of Technology, China (Project No.: 2011KA02).

Citation

Zhang, L., Wei, Y., Au, F.T.K. and Li, J. (2018), "Experimental study of two-way post-tensioned flat slabs in fire", Journal of Structural Fire Engineering, Vol. 9 No. 3, pp. 237-251. https://doi.org/10.1108/JSFE-01-2017-0016

Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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