| In engineering practice, carbon fiber-reinforced plastic (CFRP) is being widely used as the material to strengthen the concrete structures. One problem related is the effect of secondary loading, to which little attention has been paid in the literature. Presently, this problem is considered.Firstly, a simplified method for calculating the deflection of the beam strengthened with CFRP is proposed when the effect of secondary loading is considered. Numerical results with the method are in good agreement with the experimental data. The influence of the anchorage length, thickness and module of CFRP on the deflection is also analyzed.Secondly, a 3-D nonlinear finite element method, which incorporates the modeling of loading history, is developed. The CFRP- confined square columns under uni-axial loading is then studied. The behaviors of the columns are discussed through numerical results. Some useful conclusions are obtained through the study. |
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