Palestra “Dynamic identification of damage in a reinforced concrete bridge” com o professor Antonino Morassi, da Università di udine, na Poli-USP no próximo dia 13 de março

A Escola Politécnica (Poli) da USP irá receber Antonino Morassi, professor do Dipartimento Politecnico di Ingegneria e Architettura da Università di Udine, na Itália, para a palestra “Dynamic identification of damage in a reinforced concrete bridge”. 

A palestra acontecerá no dia 13 de março, quarta-feira, das 9h20 às 10h30 na sala Bandeirantes (S-07) do Prédio da Engenharia Civil.

Leia o resumo abaixo:

Nondestructive dynamic methods are a useful tool in Structural Engineering. Their purpose is twofold. First, they provide guidance on the validation of a mathematical model of the structure under investigation. Second, repeated tests over time can indicate the emergence of possible damage occurring during the structure’s lifetime. Recent technological progress has generated extremely ac-curate and reliable experimental methods, enabling a good estimate of dynamic behavior of a struc-tural system. Although experimental techniques are now well established, the interpretation of mea-surements still lags somewhat behind. This particularly concerns structural identification due to its nature of inverse problem. In addition, when identification techniques are applied to the study of real world structures, additional obstacles arise given the complexity of the structural behavior, the inaccuracy of the analytical models used to interpret experiments, measurement errors, and incomplete field data.

In this lecture we discuss the results of a campaign of dynamic tests carried out on an existing reinforced concrete single-span bridge subjected to increasing levels of damage. The deck structure consists of a slab and three simply supported beams. The damage is represented by a series of notches made on a lateral beam to simulate the effect of incremental concentrated damage. The modal parameters of the lower vibration modes were estimated from frequency response measurements obtained under harmonic excitation. The variation of resonant frequencies shows an anomalous increase in the transition from one intermediate configuration to the next damage configurations. Changes in vibration modes are appreciable from the earliest level of damage. In particular, changes in modal curvature of lower modes do provide indication on the damage location.