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Abstract:
In order to investigate the post-fire bond-slip behavior of concrete-encased concrete-filled steel tubular (CFST) stub columns, a total of 20 concrete-encased CFST stub columns subjected to push-out and push-back loads were tested after exposure to high temperature. Based on the test data, the bond-slip relationship between the steel tube and the concrete outside the steel tube was analyzed. The investigated test parameters included temperature, reinforced concrete stirrup ratio and cross-section type. The temperature distribution during the fire exposure stage, the load-slip curves, residual bond strength and relative slip between the steel tube and external concrete during the post-fire loading stage were measured and discussed. The test results show that the push-out load-slip curve can be divided into ascending, descending and re-ascending stages, but the corresponding push-back load-slip curve only includes an ascending stage and a succeeding descending stage. The bond strength of concrete-encased CFST stub column decreases significantly when the temperature ranges from 200 to 400 . For the push-out test, the bond strengths of circular and square specimens after exposure to 400 are 16% and 14% of those at 20 , respectively. The relative slip suffers a significant decrease when the temperature ranges from 200 to 500 . The relative slip value corresponding to the bond strength of circular and square specimens after 500 are 44% and 55% of those at 20 , respectively. After the temperature of 400 , the bond strength and the relative slip value increase with the increase of stirrup ratio. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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Journal of Building Structures
ISSN: 1000-6869
Year: 2019
Volume: 40
Page: 149-155
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 4
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 11
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