Flexural behavior of sea-sand seawater concrete filled CFRP-steel tube members
Yushun Xu,Yan Liang,Zhifei Zhou,Zongping Chen,Yunsheng Pang,Fan Ning,Jianbo Ye
Abstract
This paper investigates the flexural performance of Carbon Fiber-reinforced Polymer (CFRP) reinforced
circular sea-sand seawater concrete (SSC) filled steel tube (CFRP-SSCFST) members. Six specimens were tested
under different bending conditions, with key variables including the number of CFRP layers, the CFRP bonding
method, and the shear span ratio. The results indicate that all specimens demonstrated bending failure mode. The
external CFRP members underwent peeling failure, while the internal CFRP members underwent longitudinal tension
failure. CFRP significantly improved the failure mode and the mechanical performance of the CFST members. One
layer of internal CFRP reinforcement significantly enhances the flexural performance of the specimens compared to
one layer of external CFRP, with the ultimate bending moment increased by 10.92%, the residual bending moment
increased by 17.28%, and energy ductility improved by 24.19%. Both initial and serviceability-level stiffness
demonstrated no significant difference between the two configurations. Adding an external layer of CFRP to specimens
with internal CFRP did not significantly enhance their overall mechanical performance of the specimens. Based on the
existing design codes and experimental results, a flexural stiffness calculation method for CFRP-SSCFST members
considering CFRP enhancement and a predictive model for the ultimate bending moment are proposed, providing data
support and practical guidance for engineering applications.
Key Words
CFRP; CFST; flexural stiffness; SSC; ultimate bending moment
Address
Yushun Xu — Petro China Guangxi Marketing Company, Nanning 530022, P.R. China
Yan Liang — College of Civil and Architectural Engineering, Guangxi University, Nanning 530004, P.R. China
Zhifei Zhou — College of Civil and Architectural Engineering, Guangxi University, Nanning 530004, P.R. China
Zongping Chen — College of Civil and Architectural Engineering, Guangxi University, Nanning 530004, P.R. China
Yunsheng Pang — College of Civil and Architectural Engineering, Guangxi University, Nanning 530004, P.R. China
Fan Ning — College of Civil and Architectural Engineering, Guangxi Vocational Normal University, Nanning 530007, P.R. China
Jianbo Ye — Petro China Guangxi Marketing Company, Nanning 530022, P.R. China
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