FEM analysis of RC T-beams strengthened with unbounded pre-stressed CFRP belts anchored on multiple points
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Abstract:
Four simply supported reinforced concrete T-beams strengthed with externally unbonded prestressed CFRP belt were simulated by nonlinear finite element analysis using the general purpose commerical program ABAQUS. Three beams were strengthed on each side symmetrically and one beam was strengthed on bottom based on a four-point tooth waveform anchor.The analytical results show good agreement with test results on flexural capacity, elastic deformation, and ultimate flexural capacity.However the inelastic deformation of the analytical simulation has significant discrpency with that observed in the test.Therefore, to some extent, the finite element analysis can be an effective alternative to the experimental test. Based on the parameters of TL3 beam which shows the best match between the finite element analysis and the test, "two-point anchoring" and "four-point anchoring" models were designed and simulated. By comparing the results of "two-point anchoring" and "four-point anchoring" models, the method for changing the amount of CFRP and the number of anchor points based on the moment of member can not only ensure non-reduction of strengthing effect, but also can save CFRP material.
