Experimental Study on Vibration Properties of the Full-scale Flat-plate Floor Subjected to Fire

To further understand the fire behavior and vibration characteristic of flat-plate floor, this paper examines the results of a full-scale flat-plate floor subjected to fire. The case under experimental study models the reality of fire conditions and uses a special furnace to heat the bottom surface of the slab with ISO 834 standard fire curve. Detailed experimental data in the form of describing temperature distribution, vertical and edge horizontal deflections, failure pattern and vibration frequency are presented. The experiment results indicate that the top crack pattern is consistent with that at ambient temperature, and it can be assumed that the yield-line pattern at elevated temperatures should follow the conventional one. Frequency variation of the slab under fire obtained by FFT shows that the first vibration mode was generated, and the mechanical behavior could be distinguished as cracks rapidly emerge and develop phase, existed cracks slowly develop phase and stationary phase by the frequency variation. Frequency analysis also shows that the frequency can be expressed by the simultaneous central vertical displacement of the slab with a quadratic equation.