Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns

TAO Zhong; Han Linhai

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Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns

TAO Zhong 1 * #,Han Linhai 2

1.College of Civil Engineering, Fuzhou University, Fuzhou 350108

2.Department of Civil Engineering, Tsinghua University, Beijing 100084

*Correspondence author

#Submitted by

Subject:

Funding: 高等学校博士学科点专项科研基金（No.200803860005）

Opened online: 4 January 2012

Accepted by: none

Citation: TAO Zhong,Han Linhai.Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns[OL]. [ 4 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4457860

Push-out tests were carried out on sixty four concrete-filled steel tubular columns, which had been exposed to ISO 834 standard fire for 90 min or 180 min, respectively. At the same time, twelve unheated specimens were also prepared and tested for comparison. The variables investigated in the bond tests were selected as (a) fire exposure time; (b) cross-section type; (c) cross-sectional dimension; (d) interface length to diameter (or width) ratio; (e) concrete type; (f) fly ash type; and (g) concrete curing condition. The effects of the above different parameters on the bond behaviour are discussed. The test results indicate that fire exposure had a significant effect on the bond between a steel tube and its concrete core. A decrease in bond strength was generally observed for specimens after a fire exposure of 90 min; however, bond strength recovery was found when the fire exposure time was extended to 180 min. Other factors also had influence to some extent.

Keywords:Structural Engineering; Concrete-filled steel tubes; Bond strength; Push-out; Post-fire

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