| Summary: | 碩士 === 逢甲大學 === 土木工程所 === 98 === This thesis studies the post-fire-curing behaviors of fire-damaged concrete specimens with stirrups. A total of 48 low-strength concrete and 71 high-strength concrete specimens with size 12cmx24cm are made, The spacing of circular stirrups are 10cm and 5cm. The fire-damaged environments considered are 600℃, 800℃ with exposure time 120 minutes. The intermittent water curing time is 3 or 7 days, and the re-curing ages are 1, 8, 30, 60 or 90 days. All specimens were tested under uni-axial compression test to examine the effects of various conditions on the strength recovery.
The results show that 5cm spacing of stirrups can substantially increase the compressive strength and corresponding strain of concrete, thus both the strength and strain of concrete with 5cm spacing of stirrups are the largest among all the concrete specimens. For concrete specimens with post-fire-curing, the strengths rise up with the increase of re-curing age, and the strengths of concrete specimen with stirrups are higher than those without stirrups. However, the strains of concrete decrease with the increase of re-curing age. Besides, the strength recovery of low-strength concrete is more obvious than that of high-strength concrete. The results also show that post-fire-curing can significantly increase the strength of specimens exposed to 600ﾟC but can not apparently improve the strength of specimens exposed to 800ﾟC.
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