Analysis of interfacial shear stresses in beams strengthened with bonded prestressed laminates

Interfacial stress analysis of steel beams reinforced with bonded prestressed FRP plate

“…The aim of this study was to investigate practical difficulties that might be encountered when the strengthening technique is applied to existing structures. The bridge chosen for the study was a riveted simply supported girder bridge with a free span of 7.9 m [15]. Fig.…”

“…To verify the analytical model, the present predictions are compared firstly with those of [2,3,9] in the case of the absence of the prestressing force and in the second time the present method is compared with that developed by Al-Emrani and Kliger [15] in the case where only the prestressing force is applied.…”

“…In recent applications, prestressing of the FRP plates has been employed to increase the efficiency of the strengthening technique and in order to better utilize the ultra high strength of these materials. In the literature we found that the only study that investigated interfacial shear stress concentration in steel beams reinforced with prestressed laminates was developed by Al-Emrani and Kliger [15]. To the authors' best knowledge, no theoretical results have yet been published on both shear and normal interfacial stress concentration in beams strengthened with bonded prestressed laminates by considering all three common load cases (single point load, double point load and uniformly distributed load).…”

“…The considered beam is subjected to a uniformly distributed load, arbitrarily positioned single point load, or two symmetric point loads. Hence, compared with the existing solutions such as presented by Al-Emrani and Kliger [15], the present model is general in nature, and it is applicable to more general loads cases. With the escalating use of this strengthening scheme, there is a great need for calculation models that can be used to predict the magnitude of maximum interfacial stress at the end of the laminate.…”

“…The analyses provided closed-form formulas for the calculation of interfacial shear and peeling stress in beams with bonded non-prestressed plates or laminates. However, the problem of interfacial stress when prestressed laminates are used in strengthening and repair has treated only by Al-Emrani and Kliger [15]. In this investigation, only interfacial shear stress was studied and the analyzed beam was not loaded.…”