Novel assessment of bridge retrofitting measures through Interface Efficiency Indices (InterFeis) using a Guided Wave-based monitoring method

Descripción del proyecto

Formas nuevas de evaluar la readaptación de puentes

Los polímeros de fibra reforzada se crearon originalmente para la industria aeroespacial, pero ya han encontrado utilidad incluso en la ingeniería de puentes. De hecho, han sustituido a materiales tradicionales para elementos estructurales como vigas, tableros y cables de puentes, si bien existen factores que reducen la integración de los sistemas de polímeros de fibra reforzada en el puente. El proyecto financiado con fondos europeos BriFace empleará técnicas de vigilancia de la salud estructural para medir la eficacia de las medidas de refuerzo y cuantificarlas con índices de eficiencia de las interfaces (InterFeis). El proyecto definirá estos índices. Se empleará un método de ondas guiadas, un método de inspección de puentes a distancia nunca antes probado en este campo. Los resultados servirán para redactar directrices de diseño de puentes y una estrategia europea sobre seguridad de las infraestructuras.

Objetivo

Modernisation of our deficient transportation networks and in particular bridges is a pressing requirement imposed by the growing EU economy, vital to societal coherence and safety. Frequent retrofitting solutions include the use of versatile Fiber Reinforced Polymers systems (FRPs), which have been proven to enhance the capacity and deflections of bridges. Nevertheless, it is surprising that only a few, if any, research results are available with regard to the efficiency and appropriateness of FRP systems used on bridge retrofitting schemes, whilst international design guidelines neglect the level of integration of the measures with the existing bridge components. In practice, and especially in bridge decks were deterioration is expected, there is a number of limitations that reduce the level of integration of the FRP system with the bridge. This gave the BriFace project a strong motivation to utilise Structural Health Monitoring (SHM) techniques to assess the efficiency of the strengthening measure and quantify those, for the first time in the international literature, with the Interface Efficiency Indices (InterFeis), by measuring reliably the interface deflections and strains and by taking into account the failure modes and the limit stress states of bridge components. The novel objectives of BriFace are: 1) To define the Interface Efficiency Indices, 2) To utilize an expedient, long-distant inspection method of guided waves for the first time in bridge inspection, 3) To increase the interface efficiency by chemical means potentially by using nanoparticles and 4) To use InterFeis as a reliable indicator toward the quantification of the redundancy of the retrofitted bridge, as a means to assess its capacity and thus its resilience. The research outcomes will also benefit stakeholders and fuel bridge design guidelines and align them with the EU strategy on infrastructural safety and resilience.