An investigation of fatigue behavior and residual strength model of steel-GFRP composite bar

Cai, Yong-Jian; Xie, Zhi-Hong; Xiao, Shu-Hua; Huang, Ze-Run; Lin, Jia-Xiang; Guo, Yong-Chang; Zhuo, Ke-Xian; Huang, Pei-yan

doi:10.1016/j.compstruct.2023.117685

Cited by 11 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cement, a construction material that is widely used globally, emits a substantial amount of carbon dioxide during its production (approximately 1 ton of CO 2 per ton of cement) [6], contributing to the greenhouse effect and hindering sustainable development in the construction industry [7]. To mitigate global greenhouse gas emissions, novel materials and structures are necessary for carbon reduction [8][9][10]. AAC, capable of achieving similar or even superior mechanical properties to conventional concrete without cement clinker, has become a prominent topic in the field of concrete materials research [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Impact Resistance of Rubberized Alkali-Activated Concrete Incorporating Recycled Aggregate and Recycled Steel Fiber

Che,

Li,

Chen

et al. 2024

Buildings

View full text Add to dashboard Cite

Alkali-activated concrete (AAC) features excellent mechanical properties and sustainability. The incorporation of crumb rubber (CR), recycled concrete aggregates (RCAs), and recycled steel fibers (RSFs) can further enhance environmental sustainability. This paper mainly investigated the dynamic behaviors of a novel rubberized AAC incorporating RCAs and RSFs (RuAAC) through Split-Hopkinson Pressure Bar (SHPB) tests. The variables included three types of RSF content (1%, 2% and 3%), five types of rubber content (0%, 5%, 20%, 35% and 50%) and five impact pressures (0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa and 0.9 MPa). Dynamic stress–strain curves, dynamic strength, the dynamic increase factor (DIF), impact toughness and the synergistic effects of RSF and CR were discussed. The results show that increasing RSF and CR contents could improve the impact resistance of RuAAC under impact loading. The RuAAC exhibited significant strain rate sensitivity, and the sensitivity increased with larger contents of RSF and CR. The increase in strain rate sensitivity was more pronounced with higher CR contents, which was reflected in larger dynamic increase factor (DIF) values. Under high impact pressure, the impact toughness was obviously enhanced with higher RSF contents, while the contribution of increased CR content to impact toughness was not apparent, which may be attributed to the fact that this study only calculated the integral under the dynamic stress–strain curve before the peak stress to determine impact toughness, neglecting the potential contribution of CR particles after the peak point. The obvious strain sensitivity exhibited by the RuAAC in the SHPB tests indicated superior impact performance, making it particularly suitable for architectural structures prone to seismic or explosive impacts.

show abstract

Section: Introductionmentioning

confidence: 99%

Impact Resistance of Rubberized Alkali-Activated Concrete Incorporating Recycled Aggregate and Recycled Steel Fiber

Che,

Li,

Chen

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…This indicates that the FRP layer can effectively isolate corrosive substances such as seawater from the inner steel, enabling SFCBs to combine the ductility of steel bars with the corrosion resistance of FRP. This can extend the lifespan of reinforced concrete structures in marine environments, showing promising prospects [8,11,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…SFCBs exhibit a double-sigmoid stress-strain relationship under uniaxial tension [11,14]. The outer layer of FRP functions dually as a protective barrier against corrosion for the inner core steel bars, while concurrently sharing the tensile loads with them [11].…”

Section: Introductionmentioning

confidence: 99%

“…The bond between the reinforcing bars and concrete interface serves as the fundamental prerequisite for coordinated deformation and resistance to external forces [18][19][20][21]. While direct studies on the interfacial properties of the FRP layer and the steel reinforcement are lacking, numerous studies have shown that the stress-strain behavior of SFCBs under tension follows the mixture law [8,11,14,20]. This implies that the stress-strain relationship of SFCBs can be determined by combining the stiffness equivalence method based on parameters such as the elastic modulus and cross-sectional area of the FRP and inner steel.…”

Section: Introductionmentioning

confidence: 99%

“…Understanding the bond-slip behavior is of utmost importance for subsequent theoretical research and engineering design [22,23]. SFCBs exhibit unique yield points and strain hardening characteristics under uniaxial tension, adhering to a double-sigmoid stress-strain model [8,14], exhibiting mechanical properties distinct from those of FRP bars and steel reinforcement. Zhao et al [24] conducted a study examining the adhesive strength between concrete and SFCB, considering various processing techniques and surface treatments, revealing that the adhesive strength of SFCBs lies between plain steel and deformed steel.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Sustainable Steel-GFRP Composite Bars Reinforced Concrete Structure: Investigation of the Bonding Performance

Huang,

Shi,

Lian

et al. 2024

Buildings

View full text Add to dashboard Cite

Steel-fiber reinforced polymer (FRP) composite bars (SFCBs) can enhance the controllability of damage in concrete structures; thus, studying the interfacial bonding between them is fundamental and a prerequisite for achieving deformation coordination and collaboration. However, research on the interfacial bonding performance between SFCBs and concrete remains inadequate. This study conducted central pullout tests on SFCB-concrete specimens with different concrete strengths (C30, C50, and C70), bar diameters (12, 16 and 20 mm), and hoop reinforcement constraints, analyzing variations in failure modes, bond-slip curves, bond strength, etc. Additionally, finite element simulations were performed using ABAQUS software to further validate the bonding mechanism of SFCB-concrete. The results showed that the failure mode of the specimens was related to the confinement effect on the bars. Insufficient concrete cover and lack of hoop restraint led to splitting failure, whereas pullout failure occurred otherwise. For the specimens with pullout failure, the interfacial damage between the SFCB and concrete was mainly caused by the surface fibers wear of the bar and the shear of the concrete lugs, which indicated that the bond of the SFCB-concrete interface consisted mainly of mechanical interlocking forces. In addition, the variation of concrete strength as well as bar diameter did not affect the bond-slip relationship of SFCB-concrete. However, the bond strength of SFCB-concrete increased with the increase of concrete strength. For example, compared with C30 concrete, when the concrete strength was increased to C70, the bond strength of the specimens under the same conditions was increased to 50–101.6%. In contrast, the bond strength of the specimens decreased by 13.29–28.71% when the bar diameter was increased from 12 to 14 mm. These discoveries serve as valuable references for the implementation of sustainable SFCB-reinforced concrete structures.

show abstract

A novel fiber‐reinforced polymer rope: Simulation and theoretical investigation

Zhou,

Ding,

Wang

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

The study proposed using twisted rope made of flexible fiber‐reinforced polymers (FRPs) instead of wire and synthetic ropes in high load‐bearing and corrosive environments. Finite element model verification and parameter analysis were conducted for the rope, along with deriving theoretical equations for its tensile properties. Increasing the lay length improved model accuracy, with a maximum bearing capacity within a 10% margin of error compared to experimental results. The model length had minimal impact on calculation results, while changes in radial mesh size (0.13 and 0.2 mm) and friction coefficient (0–0.2) greatly affected maximum contact stress. The tensile strength and elastic modulus of the strand remained almost constant (approximately 1142 MPa and 44 GPa) when the friction coefficient was altered. Increasing lay length (6D–20D) enhanced the tensile properties of the strand, whereas tendon diameter (1–3 mm) had negligible impact. Arranging inner and outer strands with the same lay length was better for circular ropes than those with the same lay angle. Inverse lay direction reduced rope torque and increased strand contact stress. Rectangular ropes had higher strength and modulus conversion efficiency, with lower contact stress compared to circular ones. The accuracy of rope equations improved with longer lay lengths, and adding a correction factor for lay length can modify the equation.Highlights A flexible FRP rope with high strength and twisted form was proposed. The effect of construction factors on the tensile behaviors of ropes was clarified. Equations for calculating the tensile properties of ropes were derived.

show abstract

An investigation of fatigue behavior and residual strength model of steel-GFRP composite bar

Cited by 11 publications

References 31 publications

Impact Resistance of Rubberized Alkali-Activated Concrete Incorporating Recycled Aggregate and Recycled Steel Fiber

Impact Resistance of Rubberized Alkali-Activated Concrete Incorporating Recycled Aggregate and Recycled Steel Fiber

A Sustainable Steel-GFRP Composite Bars Reinforced Concrete Structure: Investigation of the Bonding Performance

A novel fiber‐reinforced polymer rope: Simulation and theoretical investigation

Contact Info

Product

Resources

About