truss2d.h

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/*
 *
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 *              ##   ##  ##   ##  ####    ####    ##  #  ##
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 *            ##   ##  ##   ##  ##      ##      ##     ##
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2013   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef truss2d_h
#define truss2d_h

#include "Elements/nlstructuralelement.h"


#define _IFT_Truss2d_Name "truss2d"
#define _IFT_Truss2d_cs "cs"


namespace oofem {
class FEI2dLineLin;
class Truss2d : public NLStructuralElement
{
protected:
    double length;
    double pitch;
    int cs_mode;
    // array for diffrent cs_modes
    static FEI2dLineLin interp[3];  // only defined it so far...
    
public:
    Truss2d(int n, Domain * d);
    virtual ~Truss2d() { }

    virtual void computeLumpedMassMatrix(FloatMatrix &answer, TimeStep *tStep);
    virtual void computeMassMatrix(FloatMatrix &answer, TimeStep *tStep)
    { computeLumpedMassMatrix(answer, tStep); }
    virtual int giveLocalCoordinateSystem(FloatMatrix &answer);

    virtual int computeGlobalCoordinates(FloatArray &answer, const FloatArray &lcoords);

    virtual int computeNumberOfDofs() { return 4; }
    virtual void giveDofManDofIDMask(int inode, IntArray &answer) const;

    virtual void computeStressVector(FloatArray &answer, const FloatArray &strain, GaussPoint *gp, TimeStep *tStep);
    virtual void computeConstitutiveMatrixAt(FloatMatrix &answer, MatResponseMode rMode, GaussPoint *gp, TimeStep *tStep);

    // characteristic length (for crack band approach)
    virtual double giveCharacteristicLength(const FloatArray &)
    { return this->computeLength(); }

    virtual double computeVolumeAround(GaussPoint *gp);

    virtual int testElementExtension(ElementExtension ext) { return ( ( ext == Element_EdgeLoadSupport ) ? 1 : 0 ); }

#ifdef __OOFEG
    virtual void drawRawGeometry(oofegGraphicContext &gc, TimeStep *tStep);
    virtual void drawDeformedGeometry(oofegGraphicContext &gc, TimeStep *tStep, UnknownType);
#endif

    // definition & identification
    virtual const char *giveInputRecordName() const { return _IFT_Truss2d_Name; }
    virtual const char *giveClassName() const { return "Truss2d"; }
    virtual IRResultType initializeFrom(InputRecord *ir);
    virtual Element_Geometry_Type giveGeometryType() const { return EGT_line_1; }
    virtual integrationDomain giveIntegrationDomain() const { return _Line; }
    virtual MaterialMode giveMaterialMode() { return _1dMat; }
    virtual FEInterpolation *giveInterpolation() const;
    
protected:
    // edge load support
    void resolveCoordIndices(int &c1, int &c2);
    virtual void giveEdgeDofMapping(IntArray &answer, int) const;
    virtual double computeEdgeVolumeAround(GaussPoint *gp, int);
    virtual int computeLoadLEToLRotationMatrix(FloatMatrix &, int, GaussPoint *gp);
    virtual void computeBmatrixAt(GaussPoint *gp, FloatMatrix &, int = 1, int = ALL_STRAINS);
    virtual void computeBHmatrixAt(GaussPoint *gp, FloatMatrix &);
    virtual void computeNmatrixAt(const FloatArray &iLocCoord, FloatMatrix &);
    virtual void computeGaussPoints();

    virtual double computeLength();
    double givePitch();
};
} // end namespace oofem
#endif // truss2d_h