United States Department of Transportation
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Finite element bond models for seven-wire prestressing strands in concrete crossties.
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2015-03-23
[PDF-4.36 MB]
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Abstract:Seven-wire strands are commonly used in pretensioned
concrete ties, but its bonding mechanism with concrete needs
further examination to provide a better understanding of some
concrete tie failure modes. As a key component in the finite
element (FE) analysis of concrete crossties, macro-scale or
phenomenological FE bond models are developed for sevenwire
strands in this paper. The strand-concrete interfaces are
homogenized with a thin layer of cohesive elements applied
between the strand and concrete elements. Further, the
cohesive elements are assigned traction-displacement
constitutive or bond relations that are defined in terms of
normal and shear stresses versus interfacial dilation and slip.
The bond relations are developed within an elasto-plastic
framework that characterizes the adhesive, frictional and/or
dilatational bonding mechanisms in the interface. The yield
functions and plastic flow rules specific for the seven-wire
strands are presented. The bond parameters are calibrated from
untensioned pullout tests and pretensioned prism tests
conducted on concrete specimens. The bond models are then
verified with (1) the surface strain data measured on actual
concrete crossties made at a tie manufacturing plant, and (2) the
force-displacement relation obtained in a center negative
moment test conducted also on concrete crossties.
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