Browsing by Author "Merouani, Mohammed Redha"
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- Finite-element analysis for the performance of steel frames under fire after earthquakePublication . Merouani, Mohammed Redha; Kada, Abdelhak; Lamri, Belkacem; Piloto, P.A.G.Recent events of fire after an earthquake (FAE) show that this is a frequent dual event leading to a significant loss which can only be reduced by increasing the level of safety. This paper presents numerical models developed for FAE analyses on 24 steel portal frames to investigate their behaviour and estimate the performance in terms of ratios with regard to horizontal displacement, fire resistance time, and critical temperature. In this study, validated numerical models are used for a parametric study to explore the effect of number of bays and stories on the performance of steel frames under two fire scenarios. Frames with one bay and one story are designed with the Algerian seismic code, RPA99v2003, considering the seismic region of Chlef and other frames are checked with Eurocode for the ultimate limit state. All frames subjected to the seismic and the ISO834 fire actions are simulated within a single software, ANSYS, for pushover and thermo-mechanical analyses. The performance is evaluated, by FAE analysis for damaged frames remaining in the plastic state and undamaged frames not reaching the plastic state, and compared to those subjected to fire without earthquake (FWoE). The frames under FAE are more vulnerable to fire and increasing damage is produced and hence reducing their structural performance. The results also show that the higher the number of bays is, the higher the performance of the frames. The critical temperature of beams decreases with the beam length. The frames with FAE, under inelastic conditions, have smaller fire resistance, when compared to undamaged frames.
- Mechanical analysis of a portal steel frame when subjected to a post-earthquake firePublication . Merouani, Mohammed Redha; Lamri, Belkacem; Kada, Abdelhak; Piloto, P.A.G.Fire or earthquake pose a significant threat to the human life, and cause an enormous damage to the structures, moreover the dual effect of a Post-Earthquake Fire (PEF) is a major hassle to designers and rescuers alike. Designers, when considering Algerian seismic rule (RPA99v2003) [1], ignore the possibility of a post-earthquake fire, whose effect can lead to the dramatic collapse of the structures.
- Mechanical analysis of a portal steel frame when subjected to a post-earthquake firePublication . Merouani, Mohammed Redha; Lamri, B.; Kada, Abdelhak; Piloto, P.A.G.Although current design code can manage the separate action of a fire or an earthquake, which causes a significant threat to the human life and to the integrity of the structures, the dual effect of a Post-Earthquake Fire (PEF) stands as a major hassle to designers and rescuers alike. Algerian seismic design code, RPA99v2003, with no exception does not consider the possibility of a subsequent fire after an earthquake, whose effect can significantly weaken the steel frame and destroy its fire protection. This paper presents the evaluation of the fire resistance for a two-storey steel portal frame, damaged by an earthquake simulated through spectrum response of Chlef, scaled three in the Algerian Seismic Code. First, the design of the steel structure considers seismic actions by a static nonlinear analysis. Second, it is followed by a fire analysis using an ISO834 standard fire model, considering that the structure is partially damaged. The finite element simulation and numerical analysis of the structure in post-earthquake fire condition yield the bilinear capacity curve at ambient temperature and the variation of local and global displacement at high temperature. A final comparison of the damaged (PEF) and undamaged (FIRE) frames subjected to the different fire scenarios is done.
- Mechanical analysis of a portal steel frame when subjected to a post-earthquake firePublication . Merouani, Mohammed Redha; Lamri, Belkacem; Kada, Abdelhak; Piloto, P.A.G.Fire or earthquake pose a significant threat to the human life, and can cause an enormous damage to the structures, moreover the dual effect of a Post-Earthquake Fire (PEF) is a major hassle to designers and rescuers alike. The experiments carried out by Petrina (2016) [1]; show that post-earthquake fire produces serious damage to the structural elements after their load resistance has been altered by a seismic action. Extensive research to study the behaviour of unprotected and protected steel structures [2-3] has been done, and yet there is still a great need for the understanding of the behaviour of structures damaged by earthquakes and exposed to fire.