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author:

Lin, Yuhan (Lin, Yuhan.) [1] | Zheng, Jinhuo (Zheng, Jinhuo.) [2] | Chen, Libo (Chen, Libo.) [3] (Scholars:陈力波) | Chen, Jinbiao (Chen, Jinbiao.) [4] | Li, Xuetong (Li, Xuetong.) [5] | Zhang, Xiaoyong (Zhang, Xiaoyong.) [6] | Yang, Fan (Yang, Fan.) [7] | Chen, Yu (Chen, Yu.) [8] (Scholars:陈誉)

Indexed by:

EI Scopus SCIE

Abstract:

This paper investigated the axial compressive behavior of concrete-filled square steel tube (CFSST) columns with debonding defects. Experimental tests were conducted on 117 CFSST columns to examine the influence of debonding defects on their failure modes and performance deterioration. The results showed that pronounced buckling and concrete cracking were observed at the debonding interface due to stress concentration. The presence of debonding defects slightly decreases the ultimate load-carrying capacity of CFSST columns but more significantly deteriorates the ductility and initial stiffness. A 2.5% volume debonding rate reduces ultimate load- carrying capacity by 11.8 %, while ductility coefficient and initial stiffness by 27.4 % and 38.1 %, respectively. Furthermore, the debonding-induced imbalance in the constraint effect of the steel tube significantly contributes to the performance deterioration of CFSST columns. This deterioration is more severe in columns with concentrated defects compared to those with uniformly dispersed defects. Finally, a theoretical formula was proposed to accurately predict the ultimate load-carrying capacity of CFSST columns with debonding defects. This formula takes into account the deterioration of the constraint effect caused by interfacial debonding. These findings inform failure and deterioration analysis for CFST structures with debonding issues.

Keyword:

Concrete-filled square steel tube column Constraint effect Debonding defects Deterioration mechanism Finite element analysis Theoretical calculation formula

Community:

  • [ 1 ] [Lin, Yuhan]Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China
  • [ 2 ] [Chen, Libo]Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China
  • [ 3 ] [Li, Xuetong]Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China
  • [ 4 ] [Yang, Fan]Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China
  • [ 5 ] [Chen, Yu]Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China
  • [ 6 ] [Zheng, Jinhuo]Fujian Architectural Design & Res Inst Co Ltd, Fuzhou 350001, Peoples R China
  • [ 7 ] [Chen, Jinbiao]Fujian Fifth Construct Grp Ltd Co, Quanzhou 362000, Peoples R China
  • [ 8 ] [Zhang, Xiaoyong]Nanjing Forestry Univ, Coll Civil Engn, Nanjing 210037, Peoples R China
  • [ 9 ] [Chen, Yu]Fuzhou Univ, Int & Hong Kong Macao & Taiwan Joint Lab Struct En, Fuzhou 350108, Peoples R China

Reprint 's Address:

  • 陈誉

    [Chen, Yu]Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China

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Source :

JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH

ISSN: 0143-974X

Year: 2024

Volume: 226

4 . 0 0 0

JCR@2023

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 1

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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