| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 94 === 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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