ltrspaceboundarytruss.C

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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
 */
 
#include "sm/Elements/3D/ltrspaceboundarytruss.h"
#include "sm/CrossSections/structuralcrosssection.h"
#include "node.h"
#include "material.h"
#include "gausspoint.h"
#include "gaussintegrationrule.h"
#include "floatmatrix.h"
#include "floatarray.h"
#include "intarray.h"
#include "mathfem.h"
#include "fei3dtetlin.h"
#include "classfactory.h"
#include "Materials/structuralms.h"
 
 
namespace oofem {
REGISTER_Element(LTRSpaceBoundaryTruss);
 
LTRSpaceBoundaryTruss :: LTRSpaceBoundaryTruss(int n, Domain *aDomain) :
    LTRSpaceBoundary(n, aDomain)
{}
 
void
LTRSpaceBoundaryTruss :: giveDofManDofIDMask(int inode, IntArray &answer) const
{
    if ( inode == 5 ) {
        answer = { E_xx };
    } else {
        answer = { D_u, D_v, D_w };
    }
}
 
 
void
LTRSpaceBoundaryTruss :: computeTransformationMatrix(FloatMatrix &answer, TimeStep *tStep)
{
    double unitCellSize = this->giveNode(5)->giveCoordinate(1);
 
    IntArray switches1, switches2, switches3, switches4;
    this->giveSwitches(switches1, this->location.at(1) );
    this->giveSwitches(switches2, this->location.at(2) );
    this->giveSwitches(switches3, this->location.at(3) );
    this->giveSwitches(switches4, this->location.at(4) );
 
    FloatMatrix k;
    k.resize(12, 1);
 
    k.at(1, 1) = unitCellSize * switches1.at(1);
    k.at(4, 1) = unitCellSize * switches2.at(1);
    k.at(7, 1) = unitCellSize * switches3.at(1);
    k.at(10, 1) = unitCellSize * switches4.at(1);
 
    answer.resize(12, 12);
    answer.beUnitMatrix();
    answer.resizeWithData(12, 13);
 
    answer.assemble(k, { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }, { 13 });
}
} // end namespace oofem