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Axial compressive behavior of recycled ceramic coarse aggregate concrete-filled steel tubular columns
Abstract A series of axial compressive tests were performed on recycled ceramic coarse aggregate concrete (RCCAC) cubes and prisms, as well as 36 recycled ceramic coarse aggregate concrete-filled steel tubular stub columns (RCCAC-FSTs) in the present study. RCCAC failure mechanisms, compressive strength, elastic modulus, and microstructure were studied. In addition to the cross-sectional type, the steel content, the confinement factor, and the replacement ratio of recycled ceramic coarse aggregate (RCCA) were chosen as primary variables to investigate the passive confinement effect of RCCAC-FSTs. Analysis of the typical failure modes, the Load (N ue)-longitudinal strain (ε L) curve, the Load (N/N ue)-hoop strain (ε h) curve, the ultimate bearing capacity, the ductility, and the effect of RCCA replacement ratio were successively performed. The results suggest that the confinement factor determines the development pattern of the load–strain curves, while the use of RCCA influences the failure mode, the elastic modulus, the ultimate strength, the critical strain, and the ductility of specimens. The critical confinement factor for circular and square specimens was also determined. A stress–strain model of RCCAC restrained by steel tube was established and verified through finite element analysis based on a database of test results presented in the present study and existing research.
Highlights 36 RCCAC specimens and 36 RCCAC-FST columns were tested under axial compression. A constitutive model for confined RCCAC is proposed. Load-strain curve of RCCAC-FST columns (r = 80%, 100%) exhibits noticeable “strain softening” phenomena. Steel tube lateral confinement could significantly improve the compressive strength and ductility of RCCAC.
Axial compressive behavior of recycled ceramic coarse aggregate concrete-filled steel tubular columns
Abstract A series of axial compressive tests were performed on recycled ceramic coarse aggregate concrete (RCCAC) cubes and prisms, as well as 36 recycled ceramic coarse aggregate concrete-filled steel tubular stub columns (RCCAC-FSTs) in the present study. RCCAC failure mechanisms, compressive strength, elastic modulus, and microstructure were studied. In addition to the cross-sectional type, the steel content, the confinement factor, and the replacement ratio of recycled ceramic coarse aggregate (RCCA) were chosen as primary variables to investigate the passive confinement effect of RCCAC-FSTs. Analysis of the typical failure modes, the Load (N ue)-longitudinal strain (ε L) curve, the Load (N/N ue)-hoop strain (ε h) curve, the ultimate bearing capacity, the ductility, and the effect of RCCA replacement ratio were successively performed. The results suggest that the confinement factor determines the development pattern of the load–strain curves, while the use of RCCA influences the failure mode, the elastic modulus, the ultimate strength, the critical strain, and the ductility of specimens. The critical confinement factor for circular and square specimens was also determined. A stress–strain model of RCCAC restrained by steel tube was established and verified through finite element analysis based on a database of test results presented in the present study and existing research.
Highlights 36 RCCAC specimens and 36 RCCAC-FST columns were tested under axial compression. A constitutive model for confined RCCAC is proposed. Load-strain curve of RCCAC-FST columns (r = 80%, 100%) exhibits noticeable “strain softening” phenomena. Steel tube lateral confinement could significantly improve the compressive strength and ductility of RCCAC.
Axial compressive behavior of recycled ceramic coarse aggregate concrete-filled steel tubular columns
Wang, Yi (author) / Huang, Hong (author) / Zeng, Jiantao (author) / Hu, Wenbin (author) / Cheng, Yingyao (author)
2023-05-26
Article (Journal)
Electronic Resource
English
Time-dependent behaviour of steel tubular columns filled with recycled coarse aggregate concrete
| Online Contents | 2016