.. include:: sub.txt ==================== ConfinedConcrete01 ==================== .. function:: 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) :noindex: =================================== =========================================================================== ``matTag`` |int| integer tag identifying material ``secType`` |str| 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`` |float| unconfined cylindrical strength of concrete specimen. ``Ec`` |float| initial elastic modulus of unconfined concrete. ``epscu_type`` |str| 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`` |float| Value for the definition of the concrete ultimate strain ``nu`` |str| or |list| Definition for Poisson's Ratio. - ``['-nu', ]`` - ``'-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`` |float| length/diameter of square/circular core section measured respect to the hoop center line. ``L2`` |float| additional dimensions when multiple hoops are being used. ``L3`` |float| additional dimensions when multiple hoops are being used. ``phis`` |float| hoop diameter. If section arrangement has multiple hoops it refers to the external hoop. ``S`` |float| hoop spacing. ``fyh`` |float| yielding strength of the hoop steel. ``Es0`` |float| elastic modulus of the hoop steel. ``haRatio`` |float| hardening ratio of the hoop steel. ``mu`` |float| ductility factor of the hoop steel. ``phiLon`` |float| diameter of longitudinal bars. ``internalArgs`` |listf| ``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`` |listf| ``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'`` |str| Unknown ``'-silica'`` |str| Unknown ``tol`` |float| Unknown ``maxNumIter`` |int| Unknown ``epscuLimit`` |float| Unknown ``stRatio`` Unknown =================================== =========================================================================== .. image:: /_static/545px-SectionTypes.png .. seealso:: `Notes `_