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author:

He, K. (He, K..) [1] | Chen, Y. (Chen, Y..) [2] (Scholars:陈誉) | Tang, J. (Tang, J..) [3] | Li, X. (Li, X..) [4]

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Abstract:

Concrete-filled stainless steel tube (CFSST) structures exhibit superior strength, durability, and fire resistance. These attributes, coupled with their aesthetic appeal and corrosion resistance, make them highly suitable for a broad range of civil engineering applications, ensuring long-term performance and safety across diverse environments. This study investigates the post-fire bond-slip performance of CFSST structures to facilitate the strengthening and retrofitting of fire-damaged CFSST structures. The paper reviews the bond-slip performance and fire resistance of CFSST. A series of fire tests and push-out tests were conducted on 99 circular CFSST stub columns, considering variables such as fire duration, wall thickness of the stainless steel tube, and concrete strength. The analysis covers the slip mechanism, load-slip relationship, sliding load, ultimate displacement, and ultimate bond strength of specimens post-fire. The bonding force between interfaces transitions from cementation to mechanical interlock and ultimately to friction, with some overlap among these mechanisms. A positive correlation exists between sliding load and wall thickness when fire duration is short. For shorter fire durations, fire exposure reduces the ultimate displacement while increasing bond-slip stiffness. Finally, a formula is proposed to predict the ultimate bond strength of CFSST stub columns following exposure to ISO 834 standard fire conditions. © 2024

Keyword:

Bond-slip CFSST Fire duration Post-fire Ultimate bond strength

Community:

  • [ 1 ] [He K.]School of Infrastructure Engineering, Nanchang University, Nanchang, 330031, China
  • [ 2 ] [Chen Y.]College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China
  • [ 3 ] [Tang J.]School of Infrastructure Engineering, Nanchang University, Nanchang, 330031, China
  • [ 4 ] [Li X.]School of Infrastructure Engineering, Nanchang University, Nanchang, 330031, China

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Source :

Thin-Walled Structures

ISSN: 0263-8231

Year: 2024

Volume: 204

5 . 7 0 0

JCR@2023

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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