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Flexural testing of an epoxy oversized strand model under traction

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Abstract

Experimental flexural tests are conducted on an epoxy oversized 1×6 strand; the objectives of these tests are to measure the bending stiffness and the associated strains. Three sets of boundary conditions are applied. The bending stiffness is deduced from the transverse midspan deflection and is found to be dependent on the axial force and the moment distribution. The deduced bending stiffness is compared to values computed from the theoretical bending stiffnesses.

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Abbreviations

a :

distance between strand midpoint and transverse loadF t/2

d c :

core diameter (2r c)

d w :

wire diameter (2r w)

E :

Young's modulus

F t :

total cross load

F z :

axial force

I :

bending inertia

k :

(F z/EI)0,5

K :

slippage coefficient

K ɛ :

slippage coefficient used in Ref. 13

L s :

assumed half-length of strand with the simply supported ends bending case, half-distance between rotation axis

L e :

half-length of strand with the fixed ends bending case, half-distance between strand grips

M :

bending moment

n :

number of the wires in a layer

p :

helical pitch

r :

helical radius of the layer of wires in the strand (r c+rw)

Y A :

transverse deflection of strand at midspan

Z :

longitudinal position from strand midpoint

θ:

helical angle

ɛĵ:

tangential strain at the extreme position of the cross section of the strand from the neutral bending plane

λ:

nondimensional parameter

μ s :

static friction coefficient

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Authors and Affiliations

  1. Laval University, G1K 7P4, Quebec, Qc, Canada

    S. Goudreau (Assistant Professor) & A. Cardou (Professor)

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  1. S. Goudreau
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  2. A. Cardou
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Goudreau, S., Cardou, A. Flexural testing of an epoxy oversized strand model under traction. Experimental Mechanics 33, 300–307 (1993). https://doi.org/10.1007/BF02322145

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  • DOI: https://doi.org/10.1007/BF02322145

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