Tri_a_fail_crit_YieldSurface.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
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or 
//  (at your option) any later version.
//
//  This software 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 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/>.
//----------------------------------------------------------------------------
/*
################################################################################
# COPYRIGHT (C):     :-))                                                      #
# PROJECT:           OpenSees                                                  #
# PURPOSE:           Triaxial Failure Criterion for Concrete - yield criterion #
# CLASS:             TriFCYieldSurface                                         #
#                                                                              #
# VERSION:           1.0                                                       #
# LANGUAGE:          C++ (ili tako nesto)                                      #
# TARGET OS:                                                                   #
# DESIGNER(S):     Boris Jeremic and Zhaohui Yang [jeremic,zhyang]@ucdavis.edu #
# PROGRAMMER(S):   Vlado Vukadin                                               #
#                                                                              #
#                                                                              #
# DATE:             June 01, 2002                                              #
# UPDATE HISTORY:    bice tako dobr da nece biti potreban update :)            #
#                                                                              #
#                                                                              #
#                                                                              #
#                                                                              #
# SHORT EXPLANATION:                                                           #
#                                                                              #
# Yield surface is based on article by Menetrey, P. and William, K.J.          #
# published in 1995 in  ACI Structural Journal pp 311-318. Purpose of the      #
# Yield surface is to model triaxial strength of concrete                      #
#                                                                              #
#                                                                              #
################################################################################
//*/

#ifndef Tri_a_fail_crit_YieldSurface_H
#define Tri_a_fail_crit_YieldSurface_H


#include "material/nD/template_3d_ep/YieldSurface.h"

namespace XC {
class TriFCYieldSurface: public YieldSurface
  {
  private:
     double fcomp;
     double ftens;
     double el;
     double c;
  public:
    YieldSurface *getCopy(void) const; //create a clone of itself
    
    TriFCYieldSurface(double fc= 0.0, double ft= 0.0, double e= 0.0, double coh= 0.0); // Default constructor

     

    double f(const EPState *EPS) const;
    BJtensor dFods(const EPState *EPS) const;

    // Redefine 1st derivative of F over scalar internal variables
    //double xi_s1( const EPState *EPS ) const;
    //double xi_s2( const EPState *EPS ) const;

    // Redefine 1st derivative of F over tensorial internal variables
    //tensor xi_t1(const EPState *EPS) const;
    
    double getFcomp(void) const;
    void setFcomp(const double &);
    double getFtens(void) const;
    void setFtens(const double &);
    double getEl(void) const;
    void setEl(const double &);
    double getC(void) const;
    void setC(const double &);

    void print(std::ostream &) const;
  };

} // end of XC namespace

#endif