Abstract
The Rockwell hardness of high-strength bolt sets subjected to high temperature was measured. According to these data, the equation that Rockwell hardness decreased at 7HRC per 100℃ above the tempering temperature was proposed as a conservative simple estimation method for fire-damaged investigation. The temperature of high-strength bolt sets was decided by averaging three temperatures, which estimated by applying the proposed equation to bolt, nut and washer. The proposed method was applied to the fire resistance test on full-scale beam and the measured temperatures of bolt sets could be estimated with adequate accuracy.
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