Numerical Study on Section Constitutive Relations of Members Reinforced by Steel-BFRP Composite Bars

2nd International Conference on Civil Engineering and Materials Science

Xiao, Tongliang^1 ; Qiu, Hongxing^2

College of Architectural Engineering, Nanjing Institute of Technology, Nanjing

211167, China^1

School of Civil Engineering, Southeast University, Nanjing

210096, China^2

关键词: Concrete strength;    Constitutive relations;    Corrosive resistances;    High elastic modulus;    Longitudinal reinforcement;    Plane cross-section assumptions;    Post-yield stiffness;    Ultimate bearing capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/216/1/012013/pdf
DOI  :  10.1088/1757-899X/216/1/012013

来源: IOP

【 摘 要 】

Steel-Basalt FRP Composite Bar (S-BFCB) is a new kind of substitute material for longitudinal reinforcement, with high elastic modulus, stable post-yield stiffness and excellent corrosive resistance. Based on mechanical properties of S-BFCB and the plane cross-section assumption, the moment-curvature curves of beam and column members are simulated. Some parameters such as equivalent rebar ratio, postyeild stiffness, concrete strength and axial compression ratio of column were discussed. Results show that the constitutive relation of the cross section is similar with RC member in elastic and cracking stages, while different in post-yield stage. With the increase of postyeild stiffness ratio of composite bar, the ultimate bearing capacity of component improved observably, member may turn out over-reinforced phenomenon, concrete crushing may appear before the fibersarefractured. The effect of concrete strength increase in lower postyeild stiffness ratio is not obvious than in higher. The increase of axial compression ratio has actively influence on bearing capacity of column, but decreases on the ductility.