Spalling risk assessment of concrete subjected to different fire scenarios

Author(s): Yiming Zhang, R. Lackner, M. Zeiml, H.A. Mang
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 786-794
Total Pages: 8
Language: English

Abstract: 
Spalling of concrete subjected to high temperature can cause loss of the cross-sectional area and exposure of steel bars to fire. Since spalling is induced by combined thermal strains (thermal-mechanical processes) and accumulated pore pressures (thermal-hydro processes), so-called coupled models are required to take into account these two mechanisms.

In this paper, the effect of underlying model assumptions on the numerical results is investigated by means of a 2D axisymmetrical model, keeping material and geometry parameters constant. Based on different fire scenarios, both coupled analysis (thermal hydromechanical) and uncoupled analysis (thermal-mechanical) are performed. While the results of the coupled analysis and uncoupled analysis give similar stresses’ distributions, relations between fire scenarios and the risk of spalling are revealed.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00