Punching shear tests on flat concrete slabs exposed to fire |
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| Affiliation: | 1. Assist. Prof. of Civil Eng. Dept., Ankara University, Ankara, Turkey;2. Assist. Prof. of Civil Eng. Dept., University of Davis, California, USA;3. Assist. of Civil Eng. Dept., Gazi University, Ankara, Turkey;4. Prof. of Civil Eng. Dept., Gazi University, Ankara, Turkey;5. Prof. Civil Eng. Dept., Ankara Yıldırım Beyazıt University, Ankara, Turkey;1. University of Manchester, School of Mechanical, Aerospace & Civil Engineering, Manchester M13 9PL, United Kingdom;2. Darbandikhan Technical Institute, Al-Sulaymania, Iraq;1. Faculty of Civil Engineering, Federal University of Para, Belem, Brazil;2. Department of Civil and Environmental Engineering, University of Brasilia, Brasilia, Brazil |
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| Abstract: | Underground parking structures often consist of flat slabs connected by columns, for which punching shear is often the most critical design criterion. In fire conditions, the punching load can increase due to restraint of the thermal curvature of the slab or due to the expansion of the columns. This increase of the punching load is discussed in the paper by means of a literature review. On the other hand, during fire the punching resistance of the slab decreases due to a gradual reduction of the material properties. This reduction in bearing capacity is studied by means of real scale fire tests, consisting of 6 slabs measuring 3.2×3.5×0.25 m with a connected column stub and tested for punching shear with a specially designed loading frame. Two reference tests are executed at ambient temperature conditions and four slabs are submitted to ISO 834 curve for 120 min. Comparison of the test data with the expected increased axial load due to thermal restraint found in the literature, shows a potential danger for premature punching failure of flat slab-column connections exposed to fire. |
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