Concrete1DFiber.hpp

Go to the documentation of this file.

//==============================================================================
//
//                       Seismo Virtual Laboratory
//             Module for Serial and Parallel Analysis of seismic 
//         wave propagation and soil-structure interaction simulation
//         Copyright (C) 2018-2021, The California Institute of Technology
//                         All Rights Reserved.
//
// Commercial use of this program without express permission of the California
// Institute of Technology, is strictly  prohibited. See  file "COPYRIGHT"  in
// main  directory  for  information on  usage  and  redistribution, and for a
// DISCLAIMER OF ALL WARRANTIES.
//
//==============================================================================
//
// Written by:
//   Danilo S. Kusanovic (dkusanov@caltech.edu)
//   Elnaz E. Seylabi    (elnaze@unr.edu)
//
// Supervised by:
//   Domniki M. Asimaki  (domniki@caltech.edu)
//
// References : 
//   [1] Mohd Hisham Mohd Yassin, "Nonlinear Analysis of Prestressed Concrete 
//       Structures under Monotonic and Cycling Loads", PhD dissertation, 
//       University of California, Berkeley, 1994.
//
// Description:
//------------------------------------------------------------------------------

#ifndef _CONCRETE1DFIBER_HPP_
#define _CONCRETE1DFIBER_HPP_

#include "Material.hpp"

class Concrete1DFiber : public Material {

    public:
        Concrete1DFiber(double fc, double ecc, double fcu, double ecu, double ratio, double ft=0.0, double Et=0.0, double nu= 0.25, double rho=0.0);

        ~Concrete1DFiber();

        //Clone the 'Concrete1DFiber' material.
        std::unique_ptr<Material> CopyMaterial();

        double GetDensity() const;

        double GetPoissonRatio() const;

        double GetBulkModulus() const;

        double GetShearModulus() const;

        double GetElasticityModulus() const;

        double GetEnergy() const;

        Eigen::MatrixXd GetDamping() const;

        Eigen::VectorXd GetStrain() const;

        Eigen::VectorXd GetStress() const;

        Eigen::VectorXd GetStrainRate() const;

        Eigen::VectorXd GetTotalStress() const;

        Eigen::MatrixXd GetTangentStiffness() const;

        Eigen::MatrixXd GetInitialTangentStiffness() const;

        void CommitState();

        void ReverseState();

        void InitialState();

        void UpdateState(const Eigen::VectorXd strain, const unsigned int cond=0);

    private:
        //Concrete properties:
        double nu;
        double Et;
        double fc; 
        double ft;
        double fcu;
        double ecu;
        double ecc;
        double Rho;
        double lambda;

        //Concrete Commited history variables:
        double newStrain;
        double newStress;
        double newTangentStiffness;
        double newMinStrain;
        double newMaxStrain;

        //Concrete Updated history variables:
        double oldStrain;
        double oldStress;
        double oldTangentStiffness;
        double oldMinStrain;
        double oldMaxStrain;

        //Envelope stress functions:
        void Tensile_Envelope(double eccn, double &fccn, double &Etn);
        void Compressive_Envelope(double eccn, double &fccn, double &Ecn);
};

#endif