Análise dinâmica experimental da rigidez de elementos de concreto submetidos à danificação progressiva até a ruptura / Dynamic experimental analysis of concrete elements stiffness subjected to progressive damage

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Structural integrity assessment may be performed by experimental modal analysis. The dynamic tests provide natural frequencies values whose changes may be used to identify existent damage and to estimate the equivalent stiffness of cracked elements. Nowadays more researches about dynamic effects on civil structures are becoming available. Among all aspects related to the dynamic behaviour of reinforced concrete structures, the progressive damage of their elements is one of great relevance. According to the damage progress, the natural frequencies decrease and the damping factors increase. These dynamic characteristics changes allow getting the equivalent stiffness values for the various degrees of cracking, even indicating the closeness to failure. The objective of this research is to assess the concrete elements integrity and to discuss the results from experimental modal analysis due to different damage levels. There were carried through dynamic and static experiments to evaluate the modulus of elasticity of concrete. It was observed its changes related to concrete micro-cracking, compression strength and age. The experimental testings had been carried through in cylindrical and prismatic specimens. The results obtained from free vibration tests were compared with the ones obtained from the usual static tests. Reinforced concrete beams were also subjected to static and dynamic testings to assess the behavior of the dynamic parameters throughout a damage process. The dynamic non-destructive tests can be used to find out concrete and reinforced beam properties, beyond its economic advantages, easiness to do and trustworthiness

ASSUNTO(S)

módulo de elasticidade dinâmico concrete ensaio de vibração equivalent stiffness dinâmica dynamic modulus of elasticity natural frequency rigidez equivalente dynamic freqüência natural concreto vibration testings

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