TY - JOUR
T1 - Experimental and numerical study on the compressive behavior of micro-expansive ultra-high-performance concrete-filled steel tube columns
AU - Huang, Wei
AU - Fan, Zhangchen
AU - Shen, Peiliang
AU - Lu, Linnu
AU - Zhou, Zhi
N1 - Funding Information:
The authors acknowledge with thanks support from (a) National Natural Science Foundation of China (Grant No. 51608406 ); (b) National Key R&D Program of China (No. 2017YFB0310001 ); (c) the Fundamental Research Funds for the Central Universities (No. WUT : 2019IB008 ).
Funding Information:
The authors acknowledge with thanks support from (a) National Natural Science Foundation of China (Grant No. 51608406); (b) National Key R&D Program of China (No.2017YFB0310001); (c) the Fundamental Research Funds for the Central Universities (No. WUT: 2019IB008).
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/9/10
Y1 - 2020/9/10
N2 - In concrete-filled steel tube (CFST) columns, conventional ultra-high-performance concrete (UHPC) has a large shrinkage and could easily be deboned from the steel tube, resulting in a failure of the effective lateral restraint of the steel tube to the core concrete. To solve this problem, a new type of micro-expansive and self-compacting UHPC was adopted to short CFST columns, which were further subjected to push-out and axial compressive tests. Test results indicated that the UHPC with the expansive agent could achieve an effective bonding between the core concrete and the steel tube. Compared with the compressive behavior of conventional UHP-CFST columns with a low confinement factor, the load-shortening curves of micro-expansive UHP-CFST columns do not show any obvious softening section. Furthermore, a finite element model of the micro-expansive UHP-CFST column was developed to predict the relationship of load and displacement by ABAQUS. Finally, the axial capacities of the short micro-expansive UHP-CFST columns obtained by the finite element analyses (FEA) were compared with that calculated by different design codes. It was concluded that the axial capacity of the composite members calculated by current codes is less than the FEA results and the formulas provided by the codes need to be further validated or modified.
AB - In concrete-filled steel tube (CFST) columns, conventional ultra-high-performance concrete (UHPC) has a large shrinkage and could easily be deboned from the steel tube, resulting in a failure of the effective lateral restraint of the steel tube to the core concrete. To solve this problem, a new type of micro-expansive and self-compacting UHPC was adopted to short CFST columns, which were further subjected to push-out and axial compressive tests. Test results indicated that the UHPC with the expansive agent could achieve an effective bonding between the core concrete and the steel tube. Compared with the compressive behavior of conventional UHP-CFST columns with a low confinement factor, the load-shortening curves of micro-expansive UHP-CFST columns do not show any obvious softening section. Furthermore, a finite element model of the micro-expansive UHP-CFST column was developed to predict the relationship of load and displacement by ABAQUS. Finally, the axial capacities of the short micro-expansive UHP-CFST columns obtained by the finite element analyses (FEA) were compared with that calculated by different design codes. It was concluded that the axial capacity of the composite members calculated by current codes is less than the FEA results and the formulas provided by the codes need to be further validated or modified.
KW - Axial capacity
KW - Concrete-filled steel tube column
KW - Expansive agent
KW - Finite element analysis
KW - Ultra-high-performance concrete
UR - http://www.scopus.com/inward/record.url?scp=85083901679&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2020.119150
DO - 10.1016/j.conbuildmat.2020.119150
M3 - Journal article
AN - SCOPUS:85083901679
SN - 0950-0618
VL - 254
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 119150
ER -