METHOD FOR EVALUATING FIREPROOF PERFORMANCE OF HIGH- STRENGTH BOLT JUNCTION PART

摘要

PROBLEM TO BE SOLVED: To drastically increase the fireproof performance of a junction part by obtaining the shear resistance of a high-strength bolt at a high temperature such as a fire temperature by multiplying the shear strength of the high-strength bolt by the number of used bolts, and a sectional area. SOLUTION: Shear resistance of a junction part at a high temperature of a high- strength bolt junction part obtained by multiplying shear strength at a fire temperature by the number of high-strength bolts used for the high-strength bolt junction part, the axial sectional area of the high-strength bolt, and the number of shear surfaces of the high-strength bolt becomes larger than the long-term load shear resistance operating on the S10T high-strength bolt. More specifically, when performing the fireproof design of a steel frame structure used for the junction part of the high- strength bolt with S10T based on the current building standard law execution method, it may be evaluated that the fireproof property exists if the assumed fire temperature is 550 deg.C or less. Even if an experiment at a high temperature being assumed in fireproof design is not performed each time, the shear strength of the high-strength bolt can be obtained by calculation, thus easily discussing the fireproof design at a high temperature being assumed under various conditions including the case of fire.