A influência das ações repetidas na aderência aço-concreto / The influence of repeated loads on the steel-concrete bond

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

This research describes the bond behaviour in reinforced concrete under monotonic and repeated loading through a state-of-art and standard pull-out tests. The influence of some parameters was analysed as deformed bar diameter, type and amplitude of loading. The monotonic test results were compared with recommendations of CEB-FIP MC 1990, EUROCODE 2 and NB-1/78. The numerical analysis of monotonic bond was realized through finite elements. It was considered smooth bar, contact elements between the steel and concrete, and materials as of linear-elastic behaviour, because the experimental degradation of bond was caused by concrete between the ribs sheared off. The monotonic bond resistance resulted between good and bad bond conditions. The results calculated according to the codes were very different from the experimental values and very disperse. The repeated loading causes bond degradation by progressive increase of slip. The numerical specimens did not represent the experimental behaviour because of the non-linear load-slip response.

ASSUNTO(S)

força repetida arrancamento finite elements força monotônica monotonic loading reinforced concrete repeated loading bond elementos finitos aderência concreto armado pull-out

ACESSO AO ARTIGO

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