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Nonlinear modeling of the cyclic response of RC columns
Melo, J.; Varum, H.; Rossetto, T.; Fernandes, C.; Costa, A.Cyclic load reversals (like those induced by earthquakes) result in accelerated bond degradation, leading to significant bar slippage. The bond-slip mechanism is reported to be one of the most common causes of damage and even collapse of existing RC structures subjected to earthquake loading. RC structures with plain reinforcing bars, designed and built prior to the enforcement of the modern seismic-oriented de...
Cyclic response of RC beam-column joints reinforced with plain bars: an experim...
Melo, J.; Varum, H.; Rossetto, T.; Costa, A.Existing reinforced concrete (RC) buildings constructed until the mid-70’s, with plain reinforcing bars, are expected to behave poorly when subjected to earthquake actions. This paper describes an experimental program designed to investigate the influence of poor detailing on the cyclic behaviour of RC beam-column joint elements. Cyclic tests were performed on five interior and five exterior full-scale beam-col...
Experimental response of RC columns built with plain bars under unidirectional ...
Melo, J.; Varum, H.; Rossetto, T.; Costa, A.A large number of existing reinforced concrete (RC) buildings structures were designed and built before mid-70’s, when the reinforcing bars had plain surface and prior to the enforcement of the modern seismic-oriented design philosophies. This paper describes a series of unidirectional cyclic tests performed on seven full-scale columns built with plain reinforcing bars, without adequate reinforcement detailing ...
Low cycle fatigue tests of reinforced concrete columns and joints built with ri...
Borg, R. C.; Rossetto, T.; Varum, H.The majority of existing reinforced concrete (RC) buildings were built prior to the introduction of seismic codes. As observed in various recent earthquakes, due to their lack of structural capacity and ductility such structures are very vulnerable and have suffered considerable damage. The number of cyclic tests that have been carried out to investigate the behaviour of RC components with detailing typical of ...
The effect of the number of response cycles on the behaviour of reinforced conc...
Borg, R. C.; Rossetto, T.; Varum, H.The development of damage in reinforced concrete (RC) structures is a cumulative process. Some damage indices used to quantify damage make use of the number of response cycles as an Engineering Demand Parameter (EDP) relating with damage development. Other indices make use of deformation in terms of displacement or chord rotation. These functions are generally a function of whether the response is monotonic or ...
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