Bulletin of Japan Association for Fire Science and Engineering

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In this study, 5 subjects of firefighters, who wore all equipment such as fireproof cloth and breathing apparatus, performed 2 times a stepping exercise for a maximum of 20 minutes in the exercise room with 25 °C or 40 °C temperature, having a rest for 30 minutes in between the exercises. They ingested 5 times 100 g water or ice slurry at 3 minutes intervals from 15 minutes before the 1st exercise and 6 minutes after the 1st exercise in order to cool the bodies by fluid intake. As the result of experiments, the high effects of ice slurry intake compared with water intake could be confirmed as the result of experiments are as follows: suppressing the increase of rectal temperature at a lower temperature increase and earlier after the 1st exercise in the exercise room with 40 °C, decreasing the rectal temperature more rapidly after the 1st exercise in the exercise room with 25 °C, reducing the increase of rectal temperature and exercise intensity by the 1st exercise in the exercise room with 40 °C at 23.8 % and 15.1 % respectively.

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There exists a potential for the fire protection used for composite beams to be omitted by suppressing temperature rise of bolt joints and maintaining the effect of rotational restrain at the beam ends during fire. In this study, on the basis of load-bearing fire tests of composite beams protected only at the ends, a three dimensional heat transfer analysis based on the finite difference method was conducted. The feature of this analysis was that the difference in thermal boundary conditions at the upper flange for each floor slab specification, the increase in heat capacity at the joint, and the heat conduction in the axial direction of the beam were taken into account. The analytical results showed good agreement with the test results. In addition, based on the heat flow analysis at each part, a simple calculation method considering only the heat transfer component that has a large effect on temperature at each part was proposed.

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