Experimental and numerical investigation of debonding process of the FRP plate-concrete interface

Finite Element Modeling of Bond Behavior of FRP and Steel Plates

“…Equation (4) furnishes values of the effective length independent from the width and approximately equal to 260 mm and 320 mm for t p = 2 mm and 3 mm, respectively. It is worth noting that the bonded lengths of 350 mm and 400 mm adopted in the FE model are always higher than the theoretical effective length, L e , provided by both Equations (1) and (4).…”

“…The characteristic values of the effective length provided by [27] are comparable with the theoretical values provided by the Chen and Teng's model [16] (260 mm and 320 mm for tp = 2 mm and 3 mm), but also in this case, they are lower than the numerical predictions, as shown in Figure 9. Equation 1 Moreover, in Figure 8, the dotted vertical lines represent the effective lengths calculated by means of Equations (1) and (4). Equation (1) provides effective lengths variable with the plate-to-concrete width, b p /b c : for t p = 2 mm they are 160 mm, 170 mm and 180 mm for b p /b c = 0.05, 0.15 and 0.25, respectively.…”

“…Debonding phenomena in externally strengthened concrete elements have been extensively studied in case of FRP plates, while few results are available for steel plates. A great deal of bond tests for FRP-concrete system have been, indeed, carried out in the past, using several set-ups including single shear test [ 4 , 10 , 11 ] as shown in Figure 1 , double shear test [ 12 ] or modified beam-test [ 13 ]. However, codified procedure for performing bond tests are still lacking, even if in [ 2 ] the analysis of a wide database of results coming from bond tests on FRP/concrete systems and realized according to different set-ups showed very scattered results depending on the testing procedures.…”

“…In fact, since the interfacial bond behavior plays a key role in the performance and the durability of the strengthened element, several experimental, analytical and numerical studies about bond behavior and debonding failure modes have been performed over the years. Debonding has been widely studied for FRP materials externally bonded to concrete substrates [ 1 , 2 , 3 , 4 ], while less studies for glued steel plates are available. Thus, most experimental results available in the scientific literature concern bond tests on FRP materials glued to concrete elements, while only few tests, not recent, were carried out on steel plate glued to concrete [ 5 , 6 , 7 ].…”

Dispositivos Para Determinação Da Concentração De Cristais De Gelo Em Solução De Gelo Líquido

“…Nesse sistema, a força aplicada ao compósito é gradualmente transmitida ao substrato por forças de cisalhamento agindo na interface (Figura 1). Estas tensões passam da extremidade carregada para a extremidade livre do PRF, de modo que o comprimento de ligação efetivo (comprimento efetivo de transferência de tensão) varia no decorrer do teste (BARBIERI et al, 2016;ZHANG et al, 2020). Consequentemente, diminui a tensão e aumenta a deformação.…”