Abstract
A correct choice of a bond model for prestressing tendons is crucial for the right modelling of a structural behaviour of a pretensioned concrete structure. The aim of this paper is the determination of an optimal bond model for 7-wire strands in a prestressed concrete beam produced in a precast concrete plant of Consolis Poland. ATENA 3D is used to develop finite element models of the beam that differ only in a bond stress-slip relationship of tendons. The bond stress-slip relationships for modelling are taken from the results of bond tests carried out by different researchers in previous years. Moreover, for comparison purposes, a simplified 2D model of the beam is created in Autodesk Robot. The strain distribution at the time of the strand release is found for each of the finite element models. The determined strain distributions are compared with the strain distribution in the beam established by an experimental test using a measuring system based on a digital image correlation. On the basis of the comparison results, the most appropriate bond models for 7-wire strands used in the beam are identified.
Highlights
As is known, the prestressing force is transferred to the concrete of a pretensioned member by the bond between the concrete and the prestressing steel [1]
Bond stress-slip relationships for 7wire strands of different researchers are analysed to evaluate their appropriateness for the use in finite element modelling of the pretensioned concrete beam made in a precast concrete plant of Consolis Poland
The assessment is done by a comparison of the strain distributions in the beam found by ARAMIS and the finite element modelling
Summary
The prestressing force is transferred to the concrete of a pretensioned member by the bond between the concrete and the prestressing steel [1]. An accurate definition of a bond model for prestressing tendons in finite element modelling of pretensioned concrete structures is key for the determination of correct results. Model Code 2010 [2] contains bond models for ribbed and plain reinforcing bars, but not for prestressing strands. Digital image correlation (DIC) is a non-contact optical technique for measuring strain and displacement [3]. In recent years, this measurement technique has been used more and more often in various fields of study: civil engineering [4], applied mechanics [5], biology [6], aerospace engineering [7] and others [8, 9]. It should be noted that the DIC technique is nowadays used in the research of prestressed concrete [10,11,12,13,14,15]
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