EQPath.h

/* ****************************************************************** **
**    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)                     **
**                                                                    **
** ****************************************************************** */
                                                                        
// Written: M. Salehi opensees.net@gmail.com
// Created: 02/19
// Revision: A

//refs
//Structural Engineeringand Mechanics   Volume 48, Number 6, December25 2013, pages 849 - 878
//DOI: https://doi.org/10.12989/sem.2013.48.6.849   
//
//Comprehensive evaluation of structural geometrical nonlinear solution techniques Part I : Formulation and characteristics of the methods
//M.Rezaiee - Pajand, M.Ghalishooyan and M.Salehi - Ahmadabad
//FULLTEXT : https://www.researchgate.net/publication/264146397_Comprehensive_evaluation_of_structural_geometrical_nonlinear_solution_techniques_Part_I_Formulation_and_characteristics_of_the_methods


//Structural Engineeringand Mechanics   Volume 48, Number 6, December25 2013, pages 879 - 914
//DOI: https://doi.org/10.12989/sem.2013.48.6.879   
//
//Comprehensive evaluation of structural geometrical nonlinear solution techniques Part II : Comparing efficiencies of the methods
//M.Rezaiee - Pajand, M.Ghalishooyan and M.Salehi - Ahmadabad
//FULLTEXT : https://www.researchgate.net/publication/263361974_Comprehensive_evaluation_of_structural_geometrical_nonlinear_solution_techniques_Part_II_Comparing_efficiencies_of_the_methods


#ifndef EQPath_h
#define EQPath_h

#include "solution/analysis/integrator/StaticIntegrator.h"

class LinearSOE;
class AnalysisModel;
class FE_Element;
class Vector;

#define SIGN_LAST_STEP      1
#define CHANGE_DETERMINANT  2

namespace XC {

//
class EQPath: public StaticIntegrator
  {
    
  private:
    double arclen,dl,m;
    double sign;
    int type,changed,nitr;
    Vector *du,*du0, *uq, *uq0, *uqn, *ur;
    Vector *q;
  protected:
    int sendData(Communicator &);
    int recvData(const Communicator &);
  public:
    EQPath(SolutionStrategy *owr,double arcLeng,int type);

    ~EQPath(void);

    int newStep(void);    
    int update(const Vector &deltaU);
    int domainChanged(void);
    
    
    int sendSelf(Communicator &);
    int recvSelf(const Communicator &);

    void Print(std::ostream &s, int flag =0) const;  
  };
} // end of XC namespace

#endif