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Bond Modelling for the Assessment of Transmission Length in Prestressed-Concrete Members

Department of Civil, Environmental and Architectural Engineering, University of Padova, via Marzolo 9, 35131 Padova, Italy
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civileng 2020, 1(2), 75-92; https://doi.org/10.3390/civileng1020006
Received: 20 May 2020 / Revised: 24 June 2020 / Accepted: 25 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Connections in Concrete)
Transmission of the prestressing force to concrete by prestressing tendons is a topic of discussion within the fib Task Group 2.5: Bond and Material Models. Particularly, the extensive use of pretensioned prestressed-concrete (PC) requires adequate knowledge of bond development at the steel–concrete interface after prestress release. The transmission length, representing the distance from the free-end of the beam necessary to transmit the fully effective prestressing-force to the surrounding concrete, is a design parameter of paramount importance for PC members detailing. This contribution presents the analytical modelling of the transmission length based on the thick-walled cylinders (TWC) theory, considering anisotropic behaviour of the concrete. To derive the optimal friction coefficient between steel and concrete, the theoretical model has been calibrated according to an experimental database of transmission lengths collected from the literature, encompassing 130 data points from 7 different campaigns. Additionally, local behaviour has been analysed by assessing radial cracking and bond stress development along the transmission length. View Full-Text
Keywords: bond stress; concrete cracking; prestressed concrete; prestressing force; transmission length bond stress; concrete cracking; prestressed concrete; prestressing force; transmission length
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Fabris, N.; Faleschini, F.; Pellegrino, C. Bond Modelling for the Assessment of Transmission Length in Prestressed-Concrete Members. civileng 2020, 1, 75-92.

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