Ema Coelho | National Laboratory for Civil Engineering (original) (raw)
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Uma vasta campanha de ensaios foi realizada sobre estruturas de betão armado representativas da p... more Uma vasta campanha de ensaios foi realizada sobre estruturas de betão armado representativas da prática de projecto e construção até finais dos anos 70 nos países do sul da Europa. Dois pórticos de 4 pisos à escala real foram projectados, construídos e testados para intensidades crescentes da acção sísmica. Os principais objectivos desta série de ensaios foram a avaliação da capacidade original destes edifícios, com e sem alvenaria, e ainda a validação experimental da eficiência de várias técnicas de reparação e reforço. Com esta comunicação pretende-se apresentar e comentar os resultados mais relevantes da campanha de ensaios realizada no âmbito do projecto ICONS.
Journal of Earthquake Engineering, 2004
An extensive program of shaking table tests on 1/4-scale three-dimensional R/C frames was jointly... more An extensive program of shaking table tests on 1/4-scale three-dimensional R/C frames was jointly carried out by the Department of Structure, Soil Mechanics and Engineering Geology (DiSGG) of the University of Basilicata, Italy, and the National Laboratory of Civil Engineering (LNEC), Portugal. It was aimed at evaluating the effectiveness of passive control bracing systems for the seismic retrofit of R/C frames designed for gravity loads only. Two different types of braces were considered, one based on the hysteretic behaviour of steel elements, the other on the superelastic properties of Shape Memory Alloys (SMA). Different protection strategies were pursued, in order to fully exploit the high energy dissipation capacity of steel-based devices, on one hand, and the supple-mental re-centring capacity of SMA-based devices, on the other hand. The experimental results confirmed the great potentials of both strategies and of the associated devices in limiting structural damage. The retrofitted model was subjected to table accelerations as high as three times the acceleration leading the unprotected model to collapse, with no significant damage to structural elements. Moreover, the re-centring capability of the SMA-based bracing system was able to recover the undeformed shape of the frame, when it was in a near-collapse condition. In this paper the experimental behaviour of the non protected and of the protected structural models are described and compared.
Uma vasta campanha de ensaios foi realizada sobre estruturas de betão armado representativas da p... more Uma vasta campanha de ensaios foi realizada sobre estruturas de betão armado representativas da prática de projecto e construção até finais dos anos 70 nos países do sul da Europa. Dois pórticos de 4 pisos à escala real foram projectados, construídos e testados para intensidades crescentes da acção sísmica. Os principais objectivos desta série de ensaios foram a avaliação da capacidade original destes edifícios, com e sem alvenaria, e ainda a validação experimental da eficiência de várias técnicas de reparação e reforço. Com esta comunicação pretende-se apresentar e comentar os resultados mais relevantes da campanha de ensaios realizada no âmbito do projecto ICONS.
Journal of Earthquake Engineering, 2004
An extensive program of shaking table tests on 1/4-scale three-dimensional R/C frames was jointly... more An extensive program of shaking table tests on 1/4-scale three-dimensional R/C frames was jointly carried out by the Department of Structure, Soil Mechanics and Engineering Geology (DiSGG) of the University of Basilicata, Italy, and the National Laboratory of Civil Engineering (LNEC), Portugal. It was aimed at evaluating the effectiveness of passive control bracing systems for the seismic retrofit of R/C frames designed for gravity loads only. Two different types of braces were considered, one based on the hysteretic behaviour of steel elements, the other on the superelastic properties of Shape Memory Alloys (SMA). Different protection strategies were pursued, in order to fully exploit the high energy dissipation capacity of steel-based devices, on one hand, and the supple-mental re-centring capacity of SMA-based devices, on the other hand. The experimental results confirmed the great potentials of both strategies and of the associated devices in limiting structural damage. The retrofitted model was subjected to table accelerations as high as three times the acceleration leading the unprotected model to collapse, with no significant damage to structural elements. Moreover, the re-centring capability of the SMA-based bracing system was able to recover the undeformed shape of the frame, when it was in a near-collapse condition. In this paper the experimental behaviour of the non protected and of the protected structural models are described and compared.