LagrangeMFreedom_FE.h

//----------------------------------------------------------------------------
//  XC program; finite element analysis code
//  for structural analysis and design.
//
//  Copyright (C)  Luis Claudio Pérez Tato
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//  developed by the  «Pacific earthquake engineering research center».
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//----------------------------------------------------------------------------
/* ****************************************************************** **
**    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.                                               **
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**                                                                    **
** Developed by:                                                      **
**   Frank McKenna (fmckenna@ce.berkeley.edu)                         **
**   Gregory L. Fenves (fenves@ce.berkeley.edu)                       **
**   Filip C. Filippou (filippou@ce.berkeley.edu)                     **
**                                                                    **
** ****************************************************************** */
                                                                        
// $Revision: 1.3 $
// $Date: 2005/11/28 21:38:40 $
// $Source: /usr/local/cvs/OpenSees/SRC/analysis/model/fe_ele/lagrange/LagrangeMFreedom_FE.h,v $
                                                                        
                                                                        
// File: ~/analysis/model/fe_ele/lagrange/LagrangeMFreedom_FE.h
// 
// Written: fmk 
// Created: 02/99
// Revision: A
//
// Description: This file contains the class definition for LagrangeMFreedom_FE.
// LagrangeMFreedom_FE is a subclass of FE_Element which handles MFreedom_Constraints
// using the Lagrange method.
//
// What: "@(#) LagrangeMFreedom_FE.h, revA"


#ifndef LagrangeMFreedom_FE_h
#define LagrangeMFreedom_FE_h

#include "solution/analysis/model/fe_ele/MFreedom_FE.h"
#include "utility/matrix/Matrix.h"
#include "utility/matrix/Vector.h"
#include "Lagrange_FE.h"

namespace XC {
class Element;
class Integrator;
class AnalysisModel;
class Domain;
class DOF_Group;

//

class LagrangeMFreedom_FE: public MFreedom_FE, public Lagrange_FE
  {
  private:
    void determineTangent(void);
    
    friend class AnalysisModel;
    LagrangeMFreedom_FE(int tag, Domain &, MFreedom_Constraint &, 
                DOF_Group &, double alpha = 1.0);
  public:

    // public methods
    virtual int setID(void);
    virtual const Matrix &getTangent(Integrator *theIntegrator);    
    virtual const Vector &getResidual(Integrator *theIntegrator);    
    virtual const Vector &getTangForce(const Vector &x, double fact = 1.0);

    virtual const Vector &getK_Force(const Vector &x, double fact = 1.0);
    virtual const Vector &getC_Force(const Vector &x, double fact = 1.0);
    virtual const Vector &getM_Force(const Vector &x, double fact = 1.0);
  };
} // end of XC namespace

#endif