The steel mesh-reinforced engineered cementitious composite (ECC) overlay with anchoring steel bolts has been experimentally proven to effectively compensate for the strength deficiency in reinforced concrete (RC) beams due to the inadequate lap splice length. This study investigates the failure mechanism and flexural performance of the strengthened RC beams using a two-dimensional finite element (FE) model, which accounts for the bond-slip behavior between concrete and steel rebars, the cohesive interaction between the overlay and the RC beam, and the anchorage effect of the steel bolts. The load-deflection curves and interfacial slip distributions between the overlay and the RC beam were predicted using the FE model, which was validated through comparisons with existing experimental data. Parametric analyses were conducted on 81 specimens to assess the effects of thickness and length of overlay, as well as spacing and layout of steel bolts, on the structural behavior of the strengthened specimens. The results indicated that the failure mode and the load-carrying capacity are governed by the distributions of interfacial slips, which are strongly influenced by the designs of the overlay and anchor layout. In addition, thicker ECC overlays and a greater number of anchoring steel bolts contribute to lower interfacial slips and higher load-carrying capacities.
Huang et al. (Sat,) studied this question.
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