Techno Press

Steel and Composite Structures   Volume 26, Number 5, March10 2018, pages 595-606
Deflection calculation method on GFRP-concrete-steel composite beam
Zhaojie Tong, Xiaodong Song and Qiao Huang

Abstract     [Full Text]
    A calculation method was presented to calculate the deflection of GFRP-concrete-steel beams with full or partial shear connections. First, the sectional analysis method was improved by considering concrete nonlinearity and shear connection stiffness variation along the beam direction. Then the equivalent slip strain was used to take into consideration of variable crosssections. Experiments and nonlinear finite element analysis were performed to validate the calculation method. The experimental results showed the deflection of composite beams could be accurately predicted by using the theoretical model or the finite element simulation. Furthermore, more finite element models were established to verify the accuracy of the theoretical model, which included different GFRP plates and different numbers of shear connectors. The theoretical results agreed well with the numerical results. In addition, parametric studies using theoretical method were also performed to find out the effect of parameters on the deflection. Based on the parametric studies, a simplified calculation formula of GFRP-concrete-steel composite beam was exhibited. In general, the calculation method could provide a more accurate theoretical result without complex finite element simulation, and serve for the further study of continuous GFRP-concrete-steel composite beams.
Key Words
    GFRP-concrete-steel; composite beam; deflection; finite element; slip; variable cross-sections
Department of Bridge Engineering, School of Transportation, Southeast University, Nanjing, China.

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