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Effetto della variazione dei materiali sulla resistenza e sulla duttilità delle strutture esistenti in calcestruzzo armato
No full textDurability of High Performance Lightweight Concrete
No full textA comprehensive experimental program was designed in order to investigate the
durability properties of high-performance lightweight concrete. The concrete mixture was
prepared in order to obtain an average compressive cylinder strength of about 70MPa at
28 days of age. Testing was carried out on a large number of lightweight concrete
specimens. The following properties were investigated: compressive strength, creep,
drying and autogenous shrinkage, water absorption, freezing-thawing resistance, air-void
parameters, corrosion, carbonation, chloride-ion penetration, sulphate-ion penetration.
The test results showed that high-performance lightweight concrete has considerable
potential for the construction industry
Galeota D. João VI: do seu translado ao acondicionamento temporário na Ilha Fiscal
Full text linkAo levar em consideração a recente movimentação da Galeota D. João VI, tanto do
seu translado quanto do acondicionamento feito para sua exposição na Ilha Fiscal,
o presente trabalho tem como intuito relatar e avaliar as ações realizadas para a
concretização dessa movimentação. Tal objetivo se justifica pelo fato dessas
execuções serem singulares, além de se tratar de uma obra de grande dimensão e
relevância, cuja conservação para a sociedade futura é importante por ser parte da
história do Brasil. Diante desse contexto, além do relato, também são exploradas
quais possíveis problemáticas que poderiam ocorrer por conta do translado, e quais
reações a materialidade da Galeota D. João VI sofreu seguindo seu novo
acondicionamento para exposição. Para isso, foi adotado uma abordagem
metodológica qualitativa de caráter exploratório. Os resultados obtidos revelam que
o transporte foi bem realizado, com grande preocupação sobre a estabilidade da
embarcação, e a respeito do acondicionamento realizado para sua exposição, foram
encontrados alguns problemas, sendo o principal deles a fonte de calor direta pela
manhã. Portanto, conclui-se que, apesar de ser uma peça de grandes dimensões e
de exemplar único no Brasil, seu transporte e acondicionamento foram realizados de
acordo com as dificuldades enfrentadas e as possibilidades em vista
Laboratory Tests On Unreinforced And Reinforced Historical Masonry Wall Specimens In L’aquila (Italy)
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Modelli di previsione del comportamento a lungo termine di travi prefabricate in calcestruzzo normale ed SCC
No full textLong-term behaviour of typical precast, prestressed double T concrete beams made of SCC and ordinary concrete was compared. Increase in deflection under load was registered in both elements for a year. Creep and shrinkage were monitored on laboratory concrete specimens as well. Data shown that concrete elements made of SCC rather than ordinary concrete perform substantially the same. Predictions of the long-term behaviour of the concrete structures was made according to different international Codes (Eurocode 2, ACI and JSCE Guidelines for Concrete) and the analytical results compared to the experimental ones
The S. Maria di Collemaggio Basilica: From Vulnerability Assessment to First Results of SHM
No full textIn this paper, the history of the basilica of Santa Maria di Collemaggio for the last 10 years is outlined: from the damage occurred during the 2009 earthquake in L'Aquila, to the rehabilitation works and the main findings of the structural health monitoring (SHM) program carried out in 2018-2019. The restoration aimed at increasing the overall structural response by reducing the local collapse mechanisms (facade, apse, nave walls, etc.) observed after the seismic event. The vulnerability analysis, assessing the seismic capacity of the masonry structure before and after the restoration, throws light on the critical kinematic mechanisms, which are currently observed by a permanent monitoring system installed in 2017. First results concerning the dynamic identification of the basilica under both operational conditions and seismic events are developed and discussed. Furthermore, the maximum accelerations engaging each masonry macroelement during the last low-intensity earthquakes are discussed
Different Codes Prediction of Long Term Behavior of NC and SCC Precast Beams
No full textLong-term behaviour of typical precast, prestressed double T concrete beams made of SCC and ordinary concrete was compared. Increase in deflection under load was registered in both elements for a year. Creep and shrinkage were monitored on laboratory concrete specimens as well. Data shown that concrete elements made of SCC rather than ordinary concrete perform substantially the same. Predictions of the long-term behaviour of the concrete structures was made according to different international Codes (Eurocode 2, ACI and JSCE Guidelines for Concrete) and the analytical results compared to the experimental ones
Analisi del comportamento sismico di Palazzo Camponeschi: modelli rappresentativi dello scenario di danno
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