Abstract
Creep characteristics of high strength bolt under high temperatures are discussed in this paper. At the creep test, the primary creep was examined taking into consideration the time of fire. The test conditions were that the property of bolt was F10T, the initial tensile stress consisted of 19 stages from 94.5kg/mm^2 to 13.5kg/mm^2, the test temperatures ranged from 250℃ to 500℃ pitches, and testing time was 6 hours in principle. After evaluation of test results, the following conclusion could be drawn. The experimental equation for the primary creep of high strength bolt was obtained, wherein an exponential approximate expression was used that employed temperatures, stress and time as variables. This experimental equation made clear that it roughly satisfactorily agreed with the results of experiments on a comparatively broad range of temperatures, stress and time.
