Abstrato

Implementation of Nonlinear Waves for Ceramic Plank Degradation Analysis

Manuel Algarra

The purpose of this study is to monitor the condition of GFRP-reinforced concrete structural members through the use of elastic wave propagation. A deck slab is selected as an illustration. The deck slab is constructed of concrete of the targeted C30/37 class under three-point bending. The strain field can be calculated by observing the specimen during loading cycles with a digital image correlation (DIC) system. The Q400 system from Dantec Dynamics GmbH includes two 12.3 Mpx Baumer cameras with VS-1220HV lenses. Signals recorded by PZT (lead-zirconate-titanate) sensors are utilized to gauge flexible waves also. In addition, the usual crack opening measurements are taken. The crack’s appearance and expansion alter the registered signals’ shape and amplitude. But the changes are hard to see and depend on where the sensors are. Because it is impossible to determine simple parameters for disturbingly wide cracks, damage detection employs an artificial neural network (ANN). A 100% correctly classified pattern and perfect determination of the specimen’s condition are possible depending on whether the element is under loading.