Bilinear.h

// -*-c++-*-
//----------------------------------------------------------------------------
//  XC program; finite element analysis code
//  for structural analysis and design.
//
//  Copyright (C)  Luis C. Pérez Tato
//
//  This program derives from OpenSees <http://opensees.berkeley.edu>
//  developed by the  «Pacific earthquake engineering research center».
//
//  Except for the restrictions that may arise from the copyright
//  of the original program (see copyright_opensees.txt)
//  XC is free software: you can redistribute it and/or modify
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//
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//  WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details. 
//
//
// You should have received a copy of the GNU General Public License 
// along with this program.
// If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------------
/* ****************************************************************** **
**    OpenSees - Open System for Earthquake Engineering Simulation    **
**          Pacific Earthquake Engineering Research Center            **
**                                                                    **
**                                                                    **
** (C) Copyright 1999, The Regents of the University of California    **
** All Rights Reserved.                                               **
**                                                                    **
** Commercial use of this program without express permission of the   **
** University of California, Berkeley, is strictly prohibited.  See   **
** file 'COPYRIGHT'  in main directory for information on usage and   **
** redistribution,  and for a DISCLAIMER OF ALL WARRANTIES.           **
**                                                                    **
** Developed by:                                                      **
**   Frank McKenna (fmckenna@ce.berkeley.edu)                         **
**   Gregory L. Fenves (fenves@ce.berkeley.edu)                       **
**   Filip C. Filippou (filippou@ce.berkeley.edu)                     **
**                                                                    **
** ****************************************************************** */
                                                                        
// $Revision: 1.1 $
// $Date: 2004/09/01 03:53:13 $
// $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/snap/Bilinear.h,v $
//
//
// Bilinear.h: implementation of the Bilinear class from Fortran version.
// Originally from SNAP PROGRAM by Luis Ibarra and Prof H.K. Krawinkler
//
// Written: A. Altoontash & Prof. G. Deierlein 12/01
// Revised: 03/02
//
// Purpose: This file contains the implementation for the Bilinear class.
//

// Bilinear.h: interface for the Bilinear class.
//

#ifndef BILINEAR_H
#define BILINEAR_H

#include <material/uniaxial/UniaxialMaterial.h>
#include <utility/matrix/Vector.h>
#include <stdio.h>
#include <material/damage/DamageModel.h>
#include <utility/recorder/response/MaterialResponse.h>

namespace XC {
//
class Bilinear: public UniaxialMaterial  
  {
 private:
     // Input parameters
    double elstk, fyieldPos ,fyieldNeg, alfa; 
    double alfaCap, capDispPos, capDispNeg, Resfac; 
    int flagCapenv;
    DamageModel *StrDamage;
    DamageModel *StfDamage;
    DamageModel *CapDamage;
    
    // Hystory data
    double hsTrial[17], hsCommit[17], hsLastCommit[17];
    
    FILE *OutputFile;        // For debugging

    // Sensitivity related variables
    int parameterID;
    Matrix *SHVs;
  public:
    Bilinear(void);
    Bilinear(int tag);
    Bilinear(int tag, Vector inputParam ,DamageModel *strength,DamageModel *stiffness,DamageModel *capping);
    virtual ~Bilinear();
  
    int setTrialStrain(double d, double strainRate = 0.0);
    double getStrain(void) const;
    double getStress(void) const;
    double getTangent(void) const;
    double getInitialTangent(void) const;

    int commitState(void);
    int revertToLastCommit(void);    
    int revertToStart(void);  

    //virtual
    UniaxialMaterial *getCopy(void) const;
  
    int sendSelf(Communicator &);  
    int recvSelf(const Communicator &);
  
    Response* setResponse(const std::vector<std::string> &argv, Information &matInfo);
    int getResponse(int responseID, Information &matInfo);

    void Print(std::ostream &s, int flag =0) const;
    int setParameter(const std::vector<std::string> &argv, Parameter &param);
    int updateParameter(int parameterID, Information &info);
    int activateParameter(int parameterID);

/*
      // Reliability and sensitivity stuff
    double getInitialTangent        (void);

    double getStressSensitivity     (int gradNumber, bool conditional);
    double getStrainSensitivity     (int gradNumber);
    double getTangentSensitivity    (int gradNumber);
    double getDampTangentSensitivity(int gradNumber);
    double getRhoSensitivity        (int gradNumber);
    int    commitSensitivity        (double strainGradient, int gradNumber, int numGrads);
  */

 protected:
    void envelPosCap( double ekelstk, double fy, double ekhard, double dcap,
                           double ekcap, double fRes, double *fuPos, double d, double *f, double *ek );
    void envelNegCap( double ekelstk, double fy, double ekhard, double dcap,
                           double ekcap, double fRes, double *fuNeg, double d, double *f, double *ek );
    void recordInfo(int cond =0);
 
  };
} // end of XC namespace

#endif