eurocode2creep.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
 *            #####    #####   ##      ######  ##     ##
 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef eurocode2creep_h
#define eurocode2creep_h
 
#include "kelvinChM.h"


#define _IFT_Eurocode2CreepMaterial_Name "ec2creepmat"
#define _IFT_Eurocode2CreepMaterial_fcm28 "fcm28"
#define _IFT_Eurocode2CreepMaterial_stiffnessFactor "stiffnessfactor"
#define _IFT_Eurocode2CreepMaterial_t0 "t0"
#define _IFT_Eurocode2CreepMaterial_cemType "cemtype"
#define _IFT_Eurocode2CreepMaterial_henv "henv"
#define _IFT_Eurocode2CreepMaterial_h0 "h0"
#define _IFT_Eurocode2CreepMaterial_shType "shtype"
#define _IFT_Eurocode2CreepMaterial_spectrum "spectrum"
#define _IFT_Eurocode2CreepMaterial_temperatureDependent "temperaturedependent"
 
namespace oofem {
class Eurocode2CreepMaterialStatus : public KelvinChainMaterialStatus
{
protected:
    double maturity = 0.;
    double tempMaturity = 0.;
    double temperature = 0.;
    double tempTemperature = 0.;
 
public:
    Eurocode2CreepMaterialStatus(GaussPoint *g, int nunits): KelvinChainMaterialStatus(g, nunits) {}
 
    void updateYourself(TimeStep *tStep) override;
 
    void saveContext(DataStream &stream, ContextMode mode) override;
    void restoreContext(DataStream &stream, ContextMode mode) override;
 
    double giveConcreteMaturity() const { return maturity; }
    void setTempConcreteMaturity(double src) { tempMaturity = src; }
 
    double giveTemperature() const { return temperature; }
    void setTempTemperature(double src) { tempTemperature = src; }
 
 
    // definition
    const char *giveClassName() const override { return "Eurocode2CreepMaterialStatus"; }
};
 

class Eurocode2CreepMaterial : public KelvinChainMaterial
{
protected:

    // the reason it is introduced is the application of the correction factors
    // to achieve a better approximation of the compliance function by the retardation spectrum
    double tau1 = 0.;

    mutable double EspringVal = 0.;
 
    // ELASTICITY + SHORT TERM + STRENGTH
    double fcm28 = 0.;

    double Ecm28 = 0.;

    double stiffnessFactor = 0.;

    double s = 0.;
 
    // CREEP
    double phi_RH = 0.;

    double beta_fcm = 0.;

    double beta_H = 0.;

    double h0 = 0.;

    double alpha_T_cement = 0.;
 
 
    // DRYING SHRINKAGE
    double t0 = 0.;

    double begOfDrying = 0.;

    double kh = 0.;

    double eps_cd_0 = 0.;
 
 
    // AUTEGENOUS SHRINKAGE
    double eps_ca_infty = 0.;

    enum ec2ShrinkageType { EC2_NoShrinkage, EC2_TotalShrinkage, EC2_DryingShrinkage, EC2_AutogenousShrinkage } shType = EC2_NoShrinkage;

    bool retardationSpectrumApproximation = 0.;

    bool temperatureDependent = 0.;
 
 
public:
    Eurocode2CreepMaterial(int n, Domain *d) : KelvinChainMaterial(n, d) {}
 
    void giveRealStressVector(FloatArray &answer, GaussPoint *gp,
                              const FloatArray &reducedStrain, TimeStep *tStep) const override;
 
    void giveShrinkageStrainVector(FloatArray &answer, GaussPoint *gp, TimeStep *tStep, ValueModeType mode) const override;
 
    const char *giveClassName() const override { return "Eurocode2CreepMaterial"; }
    const char *giveInputRecordName() const override { return _IFT_Eurocode2CreepMaterial_Name; }
    void initializeFrom(InputRecord &ir) override;
 
    std::unique_ptr<MaterialStatus> CreateStatus(GaussPoint *gp) const override;

    virtual double computeConcreteStrengthAtAge(double age) const;

    virtual double computeMeanElasticModulusAtAge(double age) const;
 

    double computeCreepFunction(double t, double t_prime, GaussPoint *gp, TimeStep *tStep) const override;

    virtual double computeCreepCoefficient(double t, double t_prime, GaussPoint *gp, TimeStep *tStep) const;
 
 
protected:
    bool hasIncrementalShrinkageFormulation() const override { return true; }
 
    double giveEModulus(GaussPoint *gp, TimeStep *tStep) const override;

    virtual double computeEquivalentAge(GaussPoint *gp, TimeStep *tStep) const;

    virtual double computeEquivalentMaturity(GaussPoint *gp, TimeStep *tStep) const;
 

    void computeElasticityStrengthParams(int);

    void computeShrinkageParams(int, double);

    void computeCreepParams(int, double);

    void computeCharTimes() override;

    double computeRetardationTimeCorrection(int mu) const;

    double evaluateSpectrumAt(double tau) const;

    FloatArray computeCharCoefficients(double tPrime, GaussPoint *gp, TimeStep *tStep) const override;

    void computeIncrementOfDryingShrinkageVector(FloatArray &answer, GaussPoint *gp, double tNow, double tThen) const;

    void computeIncrementOfAutogenousShrinkageVector(FloatArray &answer, GaussPoint *gp, double tNow, double tThen) const;
};
} // end namespace oofem
#endif // eurocode2creep_h