Nomenclature</h5> A sp area of transverse reinforcement bar</P>α s coefficient based on concrete compressive strength defined by Eq. (36) or (37) </P>β coefficient to define the slope of the descending branch defined by Eq. (39) </P>b c diameter of the concrete core</P>d specimen diameter</P>d s diameter of spiral between bar centers</P>E c concrete modulus of elasticity</P>E s steel modulus of elasticity</P>E sec concrete secant modulus of elasticity</P>ɛ 1 strain corresponding to peak stress of confined concrete</P>ɛ 01 strain corresponding to peak stress of unconfined concrete</P>ɛ 85 strain corresponding to 85% of peak stress of confined concrete on descending branch</P>ɛ 085 strain corresponding to 85% of peak stress of unconfined concrete on descending branch</P>ɛ c longitudinal concrete strain</P>ε cc ′ axial strain corresponding to the confined compressive strength</P>ε co ′ axial strain corresponding to the unconfined compressive strength</P>ɛ cu ultimate axial strain</P>f c compressive stress of unconfined concrete</P>f cc core axial stress</P>f cc ′ confined concrete compressive strength</P>f co ′ unconfined concrete compressive strength</P>f l ′ effective lateral confining stress on the concrete core</P>f l average lateral pressure</P>f le equivalent confinement pressure</P>f s transverse steel stress</P>f yh yield strength of transverse reinforcement</P>k e confinement effectiveness coefficient defined by Eq.
Engineering Structures – Elsevier
Published: Feb 1, 2014
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