void
SimpleCrossSection :: giveCharMaterialStiffnessMatrix(FloatMatrix &answer, MatResponseMode rMode, GaussPoint *gp, TimeStep *tStep)
{
    MaterialMode mode = gp->giveMaterialMode();
    if ( mode == _2dBeam ) {
        this->give2dBeamStiffMtrx(answer, rMode, gp, tStep);
    } else if ( mode == _3dBeam ) {
        this->give3dBeamStiffMtrx(answer, rMode, gp, tStep);
    } else if ( mode == _2dPlate ) {
        this->give2dPlateStiffMtrx(answer, rMode, gp, tStep);
    } else if ( mode == _3dShell ) {
        this->give3dShellStiffMtrx(answer, rMode, gp, tStep);
    } else {
        StructuralMaterial *mat = dynamic_cast< StructuralMaterial * >( this->giveMaterial(gp) );

        if ( mode == _3dMat ) {
            mat->give3dMaterialStiffnessMatrix(answer, rMode, gp, tStep);
        } else if ( mode == _PlaneStress ) {
            mat->givePlaneStressStiffMtrx(answer, rMode, gp, tStep);
        } else if ( mode == _PlaneStrain ) {
            mat->givePlaneStrainStiffMtrx(answer, rMode, gp, tStep);
        } else if ( mode == _1dMat ) {
            mat->give1dStressStiffMtrx(answer, rMode, gp, tStep);
        } else {
            mat->giveStiffnessMatrix(answer, rMode, gp, tStep);
        }
    }
}
void
SimpleCrossSection :: giveStiffnessMatrix_PlaneStrain(FloatMatrix &answer, MatResponseMode rMode, GaussPoint *gp, TimeStep *tStep)
{
    StructuralMaterial *mat = dynamic_cast< StructuralMaterial * >( this->giveMaterial(gp) );
    mat->givePlaneStrainStiffMtrx(answer, rMode, gp, tStep);
}