EXPERIMENTAL STUDY ON BONDING PROPERTIES OF CONCRETE FILLED SQUARE STEEL TUBES AFTER FIRE SPRINKLER COOLING

XIE Wangjun; CHEN Zongping; ZHOU Ji

doi:10.13204/j.gyjzG19122306

Volume 50 Issue 12

Mar. 2021

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Liu Jing, Xu Zhisheng. EXPERIMENTAL STUDY ON FIRE RESISTANCE OF PBK PANELS FOR LIGHT INTERIOR PARTITION WALL[J]. INDUSTRIAL CONSTRUCTION, 2004, 34(4): 33-35. doi: 10.13204/j.gyjz200404010

Citation:

XIE Wangjun, CHEN Zongping, ZHOU Ji. EXPERIMENTAL STUDY ON BONDING PROPERTIES OF CONCRETE FILLED SQUARE STEEL TUBES AFTER FIRE SPRINKLER COOLING[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(12): 135-143,134. doi: 10.13204/j.gyjzG19122306

Liu Jing, Xu Zhisheng. EXPERIMENTAL STUDY ON FIRE RESISTANCE OF PBK PANELS FOR LIGHT INTERIOR PARTITION WALL[J]. INDUSTRIAL CONSTRUCTION, 2004, 34(4): 33-35. doi: 10.13204/j.gyjz200404010

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EXPERIMENTAL STUDY ON BONDING PROPERTIES OF CONCRETE FILLED SQUARE STEEL TUBES AFTER FIRE SPRINKLER COOLING

doi: 10.13204/j.gyjzG19122306

XIE Wangjun^1,2,
CHEN Zongping^{2,3
,
,},
ZHOU Ji²

1. Guangxi Transport Vocational and Technical College, Nanning 530023, China;
2. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China

Received Date: 2019-12-23
Available Online: 2021-03-31

Abstract

Abstract

In order to reveal the bond-slip behavior between steel tube and core concrete after fire sprinkler cooling, 23 concrete-filled square steel tube (CFSST) specimens were designed and manufactured, and the variation parameters included the maximum temperature, the anchorage length of concrete, the concrete strength and the cooling mode. Through the push-out test, the failure modes of the specimens were observed, the whole load-slip curve and characteristic parameters were obtained,the influence of different parameters on the bond strength of the interface was analyzed, the calculation formula was put forward and the load-slip constitutive relationship model was constructed.The results showed that the shape of load-slip curve at the loading end was similar to that at the free end, and the free end sliped later.With the increase of maximum temperature, the interfacial bond strength increased first and then decreased, and reached its peak at 600 ℃. At the same time, the anchorage length had a significant effect on the interfacial bond strength and the relationship between them was inverse. The interfacial bond strength of the specimens cooled by fire sprinkler was lower than that of the natural cooling specimens.The decreasing range was gradually increased with the increase of temperature.
- high temperature test,
- concrete-filled square steel tube,
- sprinkler cooling,
- bond strength,
- slip behavior

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References(20)

References

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