Improving the performance of composite floors subjected to post-earthquake fire

Abstract

It is well-known that tensile membrane action in concrete floor slabs can enhance the fire resistance of a composite steel frame building. Vertical supports provided by protected beams along the edge of the slab panel play an important role in the development of the tensile membrane actions. The present study investigates the effect of fire insulation delamination on the protected beam, as might occur in an earthquake, on the fire resistance of composite floors subject to fire following an earthquake. The results show that fire insulation delamination considerably reduces the development of tensile membrane action. Based on the results obtained, two methods of improvement are presented to enhance the development of tensile membrane action concurrent with fire insulation delamination. It is found that increasing slab thickness and improving fire protection rating can enhance the fire resistance of the whole building even with fire insulation delamination.

Analysis of the robustness of a steel frame structure with composite floors subject to multiple fire scenarios

“…On the other hand, the main (primary) beams are assumed to be protected while the secondary beams are left unprotected to utilise tensile membrane action, an approach commonly adopted in performance-based design (Bailey, 2004). Previous work by Suwondo et al (2018) shows that heating at the primary beam may result in larger deflection without collapse. Based on this consideration, the primary beams remain protected in the current study.…”

Performance of steel moment-resisting frames in post-earthquake horizontally traveling fire

“…Also, in comparison to the residual deformation, the delamination of fire protection in the earthquake was shown to have a more significant impact on the FRR of the composite buildings. The authors subsequently investigated the efficacy of two methods of improving the composite slab's tensile membrane action in the fire, following an earthquake with damaged fire protection on its primary beams (Suwondo et al, 2018b). The thicker lightweight concrete slab's options and the primary beams with a higher FRR were investigated.…”

تحلیل حساسیت زمان گسیختگی قاب بتن آرمه ی در معرض آتش سوزی پس از زلزله نسبت به پارامترهای طراحی و بارگذاری

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