truss2d.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   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 "sm/Elements/nlstructuralelement.h"


#define _IFT_Truss2d_Name "truss2d"
 
namespace oofem {
class FEI2dLineLin;
class ParamKey;
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...
    static ParamKey IPK_Truss2d_cs;
 
public:
    Truss2d(int n, Domain *d);
    virtual ~Truss2d() { }
 
    void computeLumpedMassMatrix(FloatMatrix &answer, TimeStep *tStep) override;
    void computeMassMatrix(FloatMatrix &answer, TimeStep *tStep) override
    { computeLumpedMassMatrix(answer, tStep); }
    int giveLocalCoordinateSystem(FloatMatrix &answer) override;
 
    int computeGlobalCoordinates(FloatArray &answer, const FloatArray &lcoords) override;
 
    int computeNumberOfDofs() override { return 4; }
    void giveDofManDofIDMask(int inode, IntArray &answer) const override;
 
    void computeStressVector(FloatArray &answer, const FloatArray &strain, GaussPoint *gp, TimeStep *tStep) override;
    void computeConstitutiveMatrixAt(FloatMatrix &answer, MatResponseMode rMode, GaussPoint *gp, TimeStep *tStep) override;
    void computeConstitutiveMatrix_dPdF_At(FloatMatrix &answer, MatResponseMode rMode, GaussPoint *gp, TimeStep *tStep) override;
 
    // characteristic length (for crack band approach)
    double giveCharacteristicLength(const FloatArray &) override
    { return this->computeLength(); }
 
    double computeVolumeAround(GaussPoint *gp) override;
 
    int testElementExtension(ElementExtension ext) override { return ( ( ext == Element_EdgeLoadSupport ) ? 1 : 0 ); }
 
#ifdef __OOFEG
    void drawRawGeometry(oofegGraphicContext &gc, TimeStep *tStep) override;
    void drawDeformedGeometry(oofegGraphicContext &gc, TimeStep *tStep, UnknownType) override;
#endif
 
    // definition & identification
    const char *giveInputRecordName() const override { return _IFT_Truss2d_Name; }
    const char *giveClassName() const override { return "Truss2d"; }
    void initializeFrom(InputRecord &ir, int priority) override;
    void postInitialize() override;
    Element_Geometry_Type giveGeometryType() const override { return EGT_line_1; }
    integrationDomain giveIntegrationDomain() const override { return _Line; }
    MaterialMode giveMaterialMode() override { return _1dMat; }
    FEInterpolation *giveInterpolation() const override;
 
protected:
    // edge load support
    void resolveCoordIndices(int &c1, int &c2);
    void giveEdgeDofMapping(IntArray &answer, int) const override;
    double computeEdgeVolumeAround(GaussPoint *gp, int) override;
    int computeLoadLEToLRotationMatrix(FloatMatrix &, int, GaussPoint *gp) override;
    void computeBmatrixAt(GaussPoint *gp, FloatMatrix &, int = 1, int = ALL_STRAINS) override;
    void computeBHmatrixAt(GaussPoint *gp, FloatMatrix &) override;
    void computeNmatrixAt(const FloatArray &iLocCoord, FloatMatrix &) override;
    void computeGaussPoints() override;
 
    double computeLength() override;
    double givePitch();
};
} // end namespace oofem
#endif // truss2d_h