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Analiza sztywności zginanych belek żelbetonowych wzmocnionych taśmami z włókien węglowych

100%

Jankowiak I.

tom Nr 9

79-91

W artykule przedstawiono wybrane wyniki przeprowadzonych badań laboratoryj- nych belek żelbetowych wzmocnionych taśmami kompozytowymi z włókien węglowych przy różnych poziomach ich wstępnego obciążenia. Uwagę skupiono na analizie wzrostów sztywności i zmian krzywizn belek wzmocnionych w porównaniu ze sztywnością i krzywiznami belek bez wzmocnienia. Opisano przygotowania i przebieg badań laboratoryjnych oraz sformułowano wstępne wnioski.

In the paper the selected results of laboratory tests of ten simply supported RC bridge beams strengthened using CFRP strips were presented. The beams were strengthened by CFRP strips on their bottom surfaces at different levels of preloading. The main attention was focused on the analysis of increase in the stiffness and curvature changes of the strengthened beams in comparison with the stiffness and curvature of the reference RC beams without any strip. Arrangements and performance of laboratory tests were described and first conclusions were drawn.

Experimental study on flexural behaviour of reinforced concrete beams strengthened with passive and active CFRP strips using a novel anchorage system

75%

Piątek B. , Siwowski T.

tom Vol. 22, no. 1

art. no. e45, 2022

The paper presents the research on reinforced concrete (RC) beams strengthened with carbon fibre reinforced polymer (CFRP) strips with various configurations in terms of anchoring and tensioning. The five full-scale RC beams with the total length of 6.0 m were strengthened with passive strips, without and with mechanical anchorages at their ends, as well as with strips tensioned by the novel prestressing system with three various prestressing levels ranging from 30 to 50% of the CFRP tensile strength. All RC beams were tested under static flexural load up to failure and they were investigated in a full range of flexural behaviour, including the post-debonding phase. The main parameters considered in this study include the use of mechanical anchorages, the effect of tensioning the strips and the influence of the various prestressing levels. Several performance indicators have been established to evaluate the beams’ behaviour. The study revealed that the RC beams strengthened using tensioned CFRP strips exhibited a higher cracking, yielding and ultimate moments as compared to the beams with passively bonded CFRP strips. Moreover, increasing the beams’ prestressing level has a significant positive influence on the performance of strengthened beams. However, it did not affect the ultimate load-bearing capacity of the beams. The optimal prestressing level for the novel system has been determined as 60% of CFRP tensile strength.