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ConfinedConcrete01.rst

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ConfinedConcrete01

uniaxialMaterial('ConfinedConcrete01', matTag, secType, fpc, Ec, epscu_type, epscu_val, nu, L1, L2, L3, phis, S, fyh, Es0, haRatio, mu, phiLon, '-internal', internalArgs, '-wrap',wrapArgs, '-gravel', '-silica', '-tol', tol, '-maxNumIter', maxNumIter, '-epscuLimit', epscuLimit, '-stRatio', stRatio)

matTag integer tag identifying material

secType

tag for the transverse reinforcement configuration. see image below.

  • 'S1' square section with S1 type of transverse reinforcement with or without external FRP wrapping
  • 'S2' square section with S2 type of transverse reinforcement with or without external FRP wrapping
  • 'S3' square section with S3 type of transverse reinforcement with or without external FRP wrapping
  • 'S4a' square section with S4a type of transverse reinforcement with or without external FRP wrapping
  • 'S4b' square section with S4b type of transverse reinforcement with or without external FRP wrapping
  • 'S5' square section with S5 type of transverse reinforcement with or without external FRP wrapping
  • 'C' circular section with or without external FRP wrapping
  • 'R' rectangular section with or without external FRP wrapping.
fpc unconfined cylindrical strength of concrete specimen.
Ec initial elastic modulus of unconfined concrete.

epscu_type

Method to define confined concrete ultimate strain - -epscu then value is confined concrete ultimate strain, - -gamma then value is the ratio of the strength corresponding to ultimate strain to the peak strength of the confined concrete stress-strain curve. If gamma cannot be achieved in the range [0, epscuLimit] then epscuLimit (optional, default: 0.05) will be assumed as ultimate strain.
epscu_val Value for the definition of the concrete ultimate strain

nu or

Definition for Poisson's Ratio. - ['-nu', <value of Poisson's ratio>] - '-varub' Poisson's ratio is defined as a function of axial strain by means of the expression proposed by Braga et al. (2006) with the upper bound equal to 0.5 -'-varnoub' Poisson's ratio is defined as a function of axial strain by means of the expression proposed by Braga et al. (2006) without any upper bound.

L1

length/diameter of square/circular core section measured respect to the hoop center line.
L2 additional dimensions when multiple hoops are being used.
L3 additional dimensions when multiple hoops are being used.

phis

hoop diameter. If section arrangement has multiple hoops it refers to the external hoop.
S hoop spacing.
fyh yielding strength of the hoop steel.
Es0 elastic modulus of the hoop steel.
haRatio hardening ratio of the hoop steel.
mu ductility factor of the hoop steel.
phiLon diameter of longitudinal bars.

internalArgs

internalArgs= [phisi, Si, fyhi, Es0i, haRatioi, mui] optional parameters for defining the internal transverse reinforcement. If they are not specified they will be assumed equal to the external ones (for S2, S3, S4a, S4b and S5 typed).

wrapArgs

wrapArgs=[cover, Am, Sw, ful, Es0w] optional parameters required when section is strengthened with FRP wraps.

  • cover cover thickness measured from the outer line of hoop.
  • Am total area of FRP wraps (number of layers x wrap thickness x wrap width).
  • Sw spacing of FRP wraps (if continuous wraps are used the spacing is equal to the wrap width).
  • ful ultimate strength of FRP wraps.
  • Es0w elastic modulus of FRP wraps.
'-gravel' Unknown
'-silica' Unknown
tol Unknown
maxNumIter Unknown
epscuLimit Unknown
stRatio Unknown

image