本研究利用螺栓孔與固定插銷接合的單剪試驗來量測中鋼公司所提供之兩種鋼材(SN490B, SN490C-FR)螺栓孔試體於兩種邊距(0.5d、1.0d)與四種溫度(室溫、300℃、500℃、700℃)下之螺栓孔承壓力與變形的關係，並利用所量得之結果來檢驗各國規範中承壓力的公式與高溫下的折減公式，以選擇出最接近試驗結果之承壓力公式與高溫折減關係。此外，本研究也比較了普通鋼與耐火鋼螺栓孔試體之承壓力與其在高溫折減的差異。由實驗與分析之結果可知，美國AISC-LRFD第二版(1993)所提供的承壓力公式最接近試驗結果，而利用中鋼材料實驗室所提供的鋼材高溫折減關係所計算出之高溫螺栓孔承壓力折減最接近實驗所得之高溫承壓力折減。在耐火鋼與普通鋼螺栓孔試體的比較方面，實驗數據也印證了耐火鋼在高溫時的優良特性。

Single shear tests of bolt/bolt-hole connections at high temperatures were done in this research. The relationships of hole bearing strength and deformation for the 16 test specimens made of two steel materials (SN490B and SN490C-FR) and two edge distances (0.5d and 1.0d) under four temperatures (room, 300℃, 500℃, 700℃) were obtained. The high temperature bearing test results were used to examine the hole bearing strength and the strength reduction formulas in specifications. In addition, the hole bearing strength and the strength reduction of SN490B steel and SN490C-FR fire-resistance steel were compared in this research. The high temperature bearing test results show: (1) the bearing strength formula provided in the AISC-LRFD Specification, 2nd edition (1993), gives the best bearing strength estimation; (2) the tensile strength reduction data of steels provided by China Steel material lab give the best information for evaluating the reduction bearing strength at high temperatures, (3) SN490C-FR steel can provide good fire-resistance property for hole bearing strength at the specified high temperature.

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