熱履歴をうける高力ボルト残留軸力に関する研究 : その 2 比較的低温域で長時間加熱をうける場合

概要

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It has been shown that the slip resistance of a high strength bolted connection is reduced when it is subjected to certain temperature environments. In a recent report, it was further shown that the reduction of the residual clamping force is likely to be the primary reason for the phenomenon. The parameters varied in that study included; 1) relatively short soak time of 1 to 8 hours, 2) bolt grade, 3) bolt diameter, 4) bolt length and 5) cooling method. In this report, the behaviour of high-strength bolted joints subjected to relatively low temperatures particularly below 350℃ is investigated. The value (350℃) has been reported to be a safe limit for allowable heating temperature. The soak time (1 to 500 hours) and repeated heating hysteresis are additional features of these tests. In these tests, several types of bolted specimen were used to study the effect of grip length on the residual clamping force. The clamping force of h. s. bolts subjected to the temperature environments of this study was reduced considerably at lower maximum temperature than the limit which was currently expected to be safe. The results and recommendation of this investigation provide information necessary for the design of h. s. bolted joints which may be subjected to fire or the severe temperature found in industrial operation such as steel making and power generation.
社団法人日本建築学会の論文
1983-02-28