Analytical model for predicting the load–deflection curve of post-fire reinforced-concrete slab. (October 2018)

• Record Type: Journal Article
• Authors: Wang, Yong; Guo, Wenxuan; Huang, Zhaohui; Long, Bangyun; Yuan, Guanglin; Shi, Weinan; Zhang, Yajun
• Is Part Of: Fire safety journal. Volume 101(2018)
• Page Start: 63
• Page End: 83
• Publication Date: 2018-10
• Subjects: Reinforced-concrete slabs -- Membrane action -- Failure criterion -- Load–deflection curve -- Strain -- Post-fire; Fire prevention -- Periodicals; Incendies -- Prévention -- Recherche -- Périodiques; Fire prevention -- Research; Periodicals; 628.92205
• DOI: 10.1016/j.firesaf.2018.09.002
• Languages: English
• ISSNs: 0379-7112

Abstract

Abstract: This paper firstly presents the experimental results of two simply supported full-scale reinforced-concrete (RC) slabs (unheated and fire-damaged). Thereafter, an analytical model for predicting the load–deflection curves of post-fire RC slabs is described in detail. The model can predict ultimate loads and displacements in both post-fire RC slabs and those at ambient temperature. The developed model has been validated using test data generated in this research and previous research and compared with a few analytical models developed by other researchers; some of the proposed model's advantages are highlighted in this paper. Results indicate that the model can be employed to determine the residual strength of post-fire RC slabs with reasonable accuracy. It is evident that steel strain differences and vertical shear forces in the slab have considerable effects on the load-carrying capacities of unheated and fire-damaged RC slabs. Highlights: Two load capacity tests on unheated and fire-damaged slabs were implemented. An analytical model for predicting the load–deflection response of simply supported post-fire RC slabs was developed. The model was validated by test data and numerical results generated by other researchers. The proposed model can be used to determine the residual strength of post-fire RC slabs with reasonable accuracy.