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Advances in Civil Engineering
Volume 2016, Article ID 5659817, 14 pages
http://dx.doi.org/10.1155/2016/5659817
Research Article

Postheated Model of Confined High Strength Fibrous Concrete

1Civil Engineering Section, Aligarh Muslim University, Aligarh, India
2Department of Civil Engineering, Indian Institute of Technology, Roorkee, India

Received 16 June 2016; Accepted 25 October 2016

Academic Editor: Lucio Nobile

Copyright © 2016 Kaleem A. Zaidi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

HSC normally suffers from low stiffness and poor strain capacity after exposure to high temperature. High strength confined fibrous concrete (HSCFC) is being used in industrial structures and other high rise buildings that may be subjected to high temperature during operation or in case of an accidental fire. The proper understanding of the effect of elevated temperature on the stress-strain relationship of HSCFC is necessary for the assessment of structural safety. Further stress-strain model of HSCFC after exposure to high temperature is scarce in literature. Experimental results are used to generate the complete stress-strain curves of HSCFC after exposure to high temperature in compression. The variation in concrete mixes was achieved by varying the types of fibre, volume fraction of fibres, and temperature of exposure from ambient to 800°C. The degree of confinement was kept constant in all the specimens. A comparative assessment of different models on the high strength confined concrete was also conducted at different temperature for the accuracy of proposed model. The proposed empirical stress-strain equations are suitable for both high strength confined concrete and HSCFC after exposure to high temperature in compression. The predictions were found to be in good agreement and well fit with experimental results.