2023 TDA 4-1 ONGOING
Release time: 2024/07/22 Publisher： original Views：
Preparation and application of FRP bent bar under corrosive environment
Principal Investigator：
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Jiang Jiafei Tongji University |
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Project Background：
Corrosion of steel reinforcements in concrete structures that are explored to aggressive environments is one of the major factors that can render a structure structurally deficient before reaching the design service life. One alternative solution is the substitution of steel with fiber-reinforced polymer (FRP) bars. However, standardized, large-scale manufacture of three different types of stirrups (end-lap, closed and spiral stirrups) has not yet been well established. The mechanical behavior of stirrups and the shear/torsion failure mechanism of beams reinforced with FRP longitudinal bars and stirrups have not been investigated. Hence, further research is needed to provide technical support for the industrial production of FRP stirrups and their wide application in engineering structures.
Aims & Goals:
1.To develop 3 configuration-improved FRP stirrups, with the cost- effective and good mechanical performance;
2.To establish the bend strength models for 3 stirrups considering creep fracture effect;
3.To develop shear and shear-torsion design methods for FRP reinforced concrete members.
Outcomes:
PAPER 1: 'Shear behavior of two-span continuous concrete deep beams reinforced with GFRP bars', Engineering Structures, 2023, 90: 116367.
DOI：10.1016/j.engstruct.2023.116367
PAPER 2: 'Calculation approach for tensile strength of GFRP stirrup at bend based on database' (in chinese), Journal of Harbin Engineering University, 2024, 45(2): 223-229.
PAPER 3: 'Strength retention rate distribution model and reliability analysis of FRP stirrups', Journal of Building Materials, 2023,12.
STANDARD 1: Group standard - 'Technical specification for non dismantling composite insulation external formwork system in shear wall structures' ( draft )
PAPER 4: 'Transfer learning-based confinement strength prediction of concrete confined by FRP transverse reinforcements' , Engineering Structures, 2024, 310: 118116.
PAPER 5: 'Flexural Behavior and Design of Ultrahigh-Performance Concrete Beams Reinforced with GFRP Bars', Journal of Composites for Construction, 2024, 28(4): 04024019.