Implementation of the material model for steel relaxation given in Eurocode 2 (the same as in Model Code 2010) and in Ba{z}ant and Yu (J. More...

#include <steelrelaxmat.h>

Inheritance diagram for oofem::SteelRelaxMat:

Collaboration diagram for oofem::SteelRelaxMat:

Public Member Functions
	SteelRelaxMat (int n, Domain *d)

virtual	~SteelRelaxMat ()

virtual void	giveRealStressVector_1d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_StressControl. More...

virtual void	giveRealStressVector (FloatArray &answer, GaussPoint gp, const FloatArray &reducedStrain, TimeStep tStep)
	Computes the real stress vector for given total strain and integration point. More...

virtual void	give1dStressStiffMtrx (FloatMatrix &answer, MatResponseMode mode, GaussPoint gp, TimeStep tStep)
	Method for computing 1d stiffness matrix of receiver. More...

virtual void	giveStressDependentPartOfStrainVector (FloatArray &answer, GaussPoint gp, const FloatArray &totalStrain, TimeStep tStep, ValueModeType mode)
	evaluates stress-related strain - subtracts not only temperature strains but also strains caused by steel relaxation More...

void	computeStressRelaxationStrainVector (FloatArray &answer, GaussPoint gp, const FloatArray &totalStrain, TimeStep tStep, ValueModeType mode)
	evaluates eigenstrain due to steel relaxation More...

void	evalStressRelaxationAtConstStrain (double &answer, GaussPoint *gp, double dt)
	computes steel relaxation (eurocode formula) More...

void	computeIncrOfPrestressLossAtVarStrain (double &answer, GaussPoint gp, TimeStep tStep, double stress)
	implementation of cumulative time approach according to Eurocode to get prestress loss at variable strain More...

virtual IRResultType	initializeFrom (InputRecord *ir)
	Initializes receiver according to object description stored in input record. More...

virtual int	hasNonLinearBehaviour ()
	Returns nonzero if receiver is non linear. More...

virtual int	hasMaterialModeCapability (MaterialMode mode)
	Tests if material supports material mode. More...

virtual bool	isCharacteristicMtrxSymmetric (MatResponseMode rMode)
	Returns true if stiffness matrix of receiver is symmetric Default implementation returns true. More...

virtual const char *	giveInputRecordName () const

virtual const char *	giveClassName () const

virtual MaterialStatus *	CreateStatus (GaussPoint *gp) const
	Creates new copy of associated status and inserts it into given integration point. More...

virtual int	giveIPValue (FloatArray &answer, GaussPoint gp, InternalStateType type, TimeStep tStep)
	Returns the integration point corresponding value in Reduced form. More...

Public Member Functions inherited from oofem::StructuralMaterial
	StructuralMaterial (int n, Domain *d)
	Constructor. More...

virtual	~StructuralMaterial ()
	Destructor. More...

virtual void	giveInputRecord (DynamicInputRecord &input)
	Setups the input record string of receiver. More...

virtual void	giveStiffnessMatrix (FloatMatrix &answer, MatResponseMode mode, GaussPoint gp, TimeStep tStep)
	Computes the stiffness matrix for giveRealStressVector of receiver in given integration point, respecting its history. More...

virtual void	giveRealStressVector_3d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector for second Piola-Kirchoff stress. More...

virtual void	giveRealStressVector_PlaneStrain (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_3d. More...

virtual void	giveRealStressVector_StressControl (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, const IntArray &strainControl, TimeStep tStep)
	Iteratively calls giveRealStressVector_3d to find the stress controlled equal to zero· More...

virtual void	giveRealStressVector_ShellStressControl (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, const IntArray &strainControl, TimeStep tStep)

virtual void	giveRealStressVector_PlaneStress (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_StressControl. More...

virtual void	giveRealStressVector_Warping (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_StressControl. More...

virtual void	giveRealStressVector_2dBeamLayer (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_StressControl. More...

virtual void	giveRealStressVector_PlateLayer (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_StressControl. More...

virtual void	giveRealStressVector_Fiber (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation relies on giveRealStressVector_StressControl. More...

virtual void	giveRealStressVector_Lattice2d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)

virtual void	giveRealStressVector_Lattice3d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)

virtual void	giveRealStressVector_2dPlateSubSoil (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)
	Default implementation is not provided. More...

virtual void	giveRealStressVector_3dBeamSubSoil (FloatArray &answer, GaussPoint gp, const FloatArray &reducedE, TimeStep tStep)

virtual void	giveEshelbyStressVector_PlaneStrain (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)
	Prototype for computation of Eshelby stress. More...

void	give_dPdF_from (const FloatMatrix &dSdE, FloatMatrix &answer, GaussPoint *gp)

void	convert_dSdE_2_dPdF (FloatMatrix &answer, const FloatMatrix &dSdE, const FloatArray &S, const FloatArray &F, MaterialMode matMode)

virtual void	giveThermalDilatationVector (FloatArray &answer, GaussPoint gp, TimeStep tStep)
	Returns a vector of coefficients of thermal dilatation in direction of each material principal (local) axis. More...

double	giveReferenceTemperature ()
	Returns the reference temperature of receiver. More...

virtual void	computeStressIndependentStrainVector (FloatArray &answer, GaussPoint gp, TimeStep tStep, ValueModeType mode)
	Computes reduced strain vector in given integration point, generated by internal processes in material, which are independent on loading in particular integration point. More...

virtual void	computeStressIndependentStrainVector_3d (FloatArray &answer, GaussPoint gp, TimeStep tStep, ValueModeType mode)

virtual void	give3dMaterialStiffnessMatrix (FloatMatrix &answer, MatResponseMode mode, GaussPoint gp, TimeStep tStep)
	Computes full 3d material stiffness matrix at given integration point, time, respecting load history in integration point. More...

virtual void	give3dMaterialStiffnessMatrix_dPdF (FloatMatrix &answer, MatResponseMode mode, GaussPoint gp, TimeStep tStep)

virtual void	give3dMaterialStiffnessMatrix_dCde (FloatMatrix &answer, MatResponseMode mode, GaussPoint gp, TimeStep tStep)

void	giveStressDependentPartOfStrainVector (FloatArray &answer, GaussPoint gp, const FloatArray &reducedStrainVector, TimeStep tStep, ValueModeType mode)
	Method for subtracting from reduced space strain vector its stress-independent parts (caused by temperature, shrinkage, creep and possibly by other phenomena). More...

void	giveStressDependentPartOfStrainVector_3d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedStrainVector, TimeStep tStep, ValueModeType mode)

virtual int	setIPValue (const FloatArray &value, GaussPoint *gp, InternalStateType type)
	Sets the value of a certain variable at a given integration point to the given value. More...

virtual void	give2dBeamLayerStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing 2d beam layer stiffness matrix of receiver. More...

virtual void	givePlateLayerStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing 2d plate layer stiffness matrix of receiver. More...

virtual void	giveFiberStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing 1d fiber stiffness matrix of receiver. More...

virtual void	give2dLatticeStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing 2d lattice stiffness matrix of receiver. More...

virtual void	give3dLatticeStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing 3d lattice stiffness matrix of receiver. More...

virtual void	give2dPlateSubSoilStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing stiffness matrix of plate subsoil model. More...

virtual void	give3dBeamSubSoilStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing stiffness matrix of beam3d subsoil model. More...

virtual void	giveFirstPKStressVector_3d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)
	Default implementation relies on giveRealStressVector for second Piola-Kirchoff stress. More...

virtual void	giveFirstPKStressVector_PlaneStrain (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)
	Default implementation relies on giveFirstPKStressVector_3d. More...

virtual void	giveFirstPKStressVector_PlaneStress (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)
	Default implementation relies on giveFirstPKStressVector_3d. More...

virtual void	giveFirstPKStressVector_1d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)
	Default implementation relies on giveFirstPKStressVector_3d. More...

virtual void	giveCauchyStressVector_3d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)

virtual void	giveCauchyStressVector_PlaneStrain (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)

virtual void	giveCauchyStressVector_PlaneStress (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)

virtual void	giveCauchyStressVector_1d (FloatArray &answer, GaussPoint gp, const FloatArray &reducedF, TimeStep tStep)

virtual void	givePlaneStressStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing plane stress stiffness matrix of receiver. More...

virtual void	givePlaneStressStiffMtrx_dPdF (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)

virtual void	givePlaneStressStiffMtrx_dCde (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)

virtual void	givePlaneStrainStiffMtrx (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)
	Method for computing plane strain stiffness matrix of receiver. More...

virtual void	givePlaneStrainStiffMtrx_dPdF (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)

virtual void	givePlaneStrainStiffMtrx_dCde (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)

virtual void	give1dStressStiffMtrx_dPdF (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)

virtual void	give1dStressStiffMtrx_dCde (FloatMatrix &answer, MatResponseMode mmode, GaussPoint gp, TimeStep tStep)

Public Member Functions inherited from oofem::Material
	Material (int n, Domain *d)
	Constructor. More...

virtual	~Material ()
	Destructor. More...

virtual double	give (int aProperty, GaussPoint *gp)
	Returns the value of material property 'aProperty'. More...

virtual bool	hasProperty (int aProperty, GaussPoint *gp)
	Returns true if 'aProperty' exists on material. More...

virtual void	modifyProperty (int aProperty, double value, GaussPoint *gp)
	Modify 'aProperty', which already exists on material. More...

double	giveCastingTime ()

virtual bool	isActivated (TimeStep *tStep)

virtual int	hasCastingTimeSupport ()
	Tests if material supports casting time. More...

virtual void	printYourself ()
	Prints receiver state on stdout. Useful for debugging. More...

virtual contextIOResultType	saveIPContext (DataStream &stream, ContextMode mode, GaussPoint *gp)
	Stores integration point state to output stream. More...

virtual contextIOResultType	restoreIPContext (DataStream &stream, ContextMode mode, GaussPoint *gp)
	Reads integration point state to output stream. More...

virtual int	checkConsistency ()
	Allows programmer to test some internal data, before computation begins. More...

virtual int	initMaterial (Element *element)
	Optional function to call specific procedures when initializing a material. More...

virtual MaterialStatus *	giveStatus (GaussPoint *gp) const
	Returns material status of receiver in given integration point. More...

virtual int	packUnknowns (DataStream &buff, TimeStep tStep, GaussPoint ip)
	Pack all necessary data of integration point (according to element parallel_mode) into given communication buffer. More...

virtual int	unpackAndUpdateUnknowns (DataStream &buff, TimeStep tStep, GaussPoint ip)
	Unpack and updates all necessary data of given integration point (according to element parallel_mode) into given communication buffer. More...

virtual int	estimatePackSize (DataStream &buff, GaussPoint *ip)
	Estimates the necessary pack size to hold all packed data of receiver. More...

virtual double	predictRelativeComputationalCost (GaussPoint *gp)
	Returns the weight representing relative computational cost of receiver The reference material model is linear isotropic material - its weight is set to 1.0 The other material models should compare to this reference model. More...

virtual double	predictRelativeRedistributionCost (GaussPoint *gp)
	Returns the relative redistribution cost of the receiver. More...

virtual void	initTempStatus (GaussPoint *gp)
	Initializes temporary variables stored in integration point status at the beginning of new time step. More...

Public Member Functions inherited from oofem::FEMComponent
	FEMComponent (int n, Domain *d)
	Regular constructor, creates component with given number and belonging to given domain. More...

virtual	~FEMComponent ()
	Virtual destructor. More...

Domain *	giveDomain () const

virtual void	setDomain (Domain *d)
	Sets associated Domain. More...

int	giveNumber () const

void	setNumber (int num)
	Sets number of receiver. More...

virtual void	updateLocalNumbering (EntityRenumberingFunctor &f)
	Local renumbering support. More...

virtual contextIOResultType	saveContext (DataStream &stream, ContextMode mode, void *obj=NULL)
	Stores receiver state to output stream. More...

virtual contextIOResultType	restoreContext (DataStream &stream, ContextMode mode, void *obj=NULL)
	Restores the receiver state previously written in stream. More...

virtual void	printOutputAt (FILE file, TimeStep tStep)
	Prints output of receiver to stream, for given time step. More...

virtual Interface *	giveInterface (InterfaceType t)
	Interface requesting service. More...

std::string	errorInfo (const char *func) const
	Returns string for prepending output (used by error reporting macros). More...

Protected Types
enum	approachType { Bazant_EC2, EquivTime_EC2 }
	0 = approach according to Ba{z}ant and Yu, 1 = equivalent time approach according to Eurocode 2 and {{fib}} Model Code 2010 More...

Protected Attributes
double	E
	Young's modulus. More...

double	k1
	constant depending on the reinforcement class More...

double	k2
	constant depending on the reinforcement class More...

double	rho1000
	constant depending on the reinforcement class More...

double	mu
	ratio of prestress vs. characteristic strength More...

double	timeFactor
	Scaling factor transforming the actual time into appropriate units needed by the formulae of the eurocode. More...

double	charStrength
	characteristic strength of prestressing steel in appropriate units (not necessarily MPa) More...

double	tolerance
	tolerance specifying the residual in the stress evaluation algorithm, default value is $10^{-6}$ More...

double	relRelaxBound
	Ratio of stress to characteristic strength under which the relaxation is zero (typically 0.4–0.5); default value is zero. More...

enum oofem::SteelRelaxMat::approachType	Approach

Protected Attributes inherited from oofem::StructuralMaterial
double	referenceTemperature
	Reference temperature (temperature, when material has been built into structure). More...

Protected Attributes inherited from oofem::Material
Dictionary	propertyDictionary
	Property dictionary. More...

double	castingTime
	Casting time. More...

Protected Attributes inherited from oofem::FEMComponent
int	number
	Component number. More...

Domain *	domain
	Link to domain object, useful for communicating with other FEM components. More...

Additional Inherited Members
Static Public Member Functions inherited from oofem::StructuralMaterial
static int	giveSymVI (int ind1, int ind2)

static int	giveVI (int ind1, int ind2)

static int	giveVoigtVectorMask (IntArray &answer, MaterialMode mmode)
	Returns a mask of the vector indicies corresponding to components in a general (non-symmetric) second order tensor of some stress/strain/deformation measure that performes work. More...

static int	giveVoigtSymVectorMask (IntArray &answer, MaterialMode mmode)
	The same as giveVoigtVectorMask but returns a mask corresponding to a symmetric second order tensor. More...

static void	giveInvertedVoigtVectorMask (IntArray &answer, MaterialMode mmode)
	Gives the inverted version of giveVoigtVectorMask. More...

static int	giveSizeOfVoigtVector (MaterialMode mmode)
	Returns the size of reduced stress/strain vector according to given mode. More...

static int	giveSizeOfVoigtSymVector (MaterialMode mmode)
	Returns the size of symmetric part of a reduced stress/strain vector according to given mode. More...

static void	giveFullVectorForm (FloatArray &answer, const FloatArray &strainVector, MaterialMode matMode)
	Converts the reduced symmetric Voigt vector (2nd order tensor) to full form. More...

static void	giveFullVectorFormF (FloatArray &answer, const FloatArray &strainVector, MaterialMode matMode)
	Converts the reduced deformation gradient Voigt vector (2nd order tensor). More...

static void	giveFullSymVectorForm (FloatArray &answer, const FloatArray &vec, MaterialMode matMode)
	Converts the reduced unsymmetric Voigt vector (2nd order tensor) to full form. More...

static void	giveReducedVectorForm (FloatArray &answer, const FloatArray &vec, MaterialMode matMode)
	Converts the full symmetric Voigt vector (2nd order tensor) to reduced form. More...

static void	giveReducedSymVectorForm (FloatArray &answer, const FloatArray &vec, MaterialMode matMode)
	Converts the full unsymmetric Voigt vector (2nd order tensor) to reduced form. More...

static void	giveFullSymMatrixForm (FloatMatrix &answer, const FloatMatrix &red, MaterialMode matMode)
	Converts the full unsymmetric Voigt matrix (4th order tensor) to reduced form. More...

static void	giveReducedMatrixForm (FloatMatrix &answer, const FloatMatrix &full, MaterialMode matMode)
	Converts the full symmetric Voigt matrix (4th order tensor) to reduced form. More...

static void	giveReducedSymMatrixForm (FloatMatrix &answer, const FloatMatrix &full, MaterialMode matMode)
	Converts the full unsymmetric Voigt matrix (4th order tensor) to reduced form. More...

static void	transformStrainVectorTo (FloatArray &answer, const FloatMatrix &base, const FloatArray &strainVector, bool transpose=false)
	Transforms 3d strain vector into another coordinate system. More...

static void	transformStressVectorTo (FloatArray &answer, const FloatMatrix &base, const FloatArray &stressVector, bool transpose=false)
	Transforms 3d stress vector into another coordinate system. More...

static double	computeVonMisesStress (const FloatArray *currentStress)
	Computes equivalent of von Mises stress. More...

static void	giveStrainVectorTranformationMtrx (FloatMatrix &answer, const FloatMatrix &base, bool transpose=false)
	Computes 3d strain vector transformation matrix from standard vector transformation matrix. More...

static void	give2DStrainVectorTranformationMtrx (FloatMatrix &answer, const FloatMatrix &base, bool transpose=false)
	Computes 2d strain vector transformation matrix from standard vector transformation matrix. More...

static void	giveStressVectorTranformationMtrx (FloatMatrix &answer, const FloatMatrix &base, bool transpose=false)
	Computes 3d stress vector transformation matrix from standard vector transformation matrix. More...

static void	givePlaneStressVectorTranformationMtrx (FloatMatrix &answer, const FloatMatrix &base, bool transpose=false)
	Computes 2d stress vector transformation matrix from standard vector transformation matrix. More...

static void	sortPrincDirAndValCloseTo (FloatArray pVal, FloatMatrix pDir, FloatMatrix *toPDir)
	Method for sorting newly computed principal values (pVal) and corresponding principal directions (pDir) to be closed to some (often previous) principal directions (toPDir). More...

static void	computePrincipalValues (FloatArray &answer, const FloatArray &s, stressStrainPrincMode mode)
	Common functions for convenience. More...

static void	computePrincipalValDir (FloatArray &answer, FloatMatrix &dir, const FloatArray &s, stressStrainPrincMode mode)
	Computes principal values and directions of stress or strain vector. More...

static double	computeDeviatoricVolumetricSplit (FloatArray &dev, const FloatArray &s)
	Computes split of receiver into deviatoric and volumetric part. More...

static void	computeDeviatoricVolumetricSum (FloatArray &s, const FloatArray &dev, double mean)

static void	applyDeviatoricElasticCompliance (FloatArray &strain, const FloatArray &stress, double EModulus, double nu)

static void	applyDeviatoricElasticCompliance (FloatArray &strain, const FloatArray &stress, double GModulus)

static void	applyDeviatoricElasticStiffness (FloatArray &stress, const FloatArray &strain, double EModulus, double nu)

static void	applyDeviatoricElasticStiffness (FloatArray &stress, const FloatArray &strain, double GModulus)

static void	applyElasticStiffness (FloatArray &stress, const FloatArray &strain, double EModulus, double nu)

static void	applyElasticCompliance (FloatArray &strain, const FloatArray &stress, double EModulus, double nu)

static double	computeStressNorm (const FloatArray &stress)

static double	computeFirstInvariant (const FloatArray &s)

static double	computeSecondStressInvariant (const FloatArray &s)

static double	computeThirdStressInvariant (const FloatArray &s)

static double	computeFirstCoordinate (const FloatArray &s)

static double	computeSecondCoordinate (const FloatArray &s)

static double	computeThirdCoordinate (const FloatArray &s)

Static Public Attributes inherited from oofem::StructuralMaterial
static std::vector< std::vector< int > >	vIindex
	Voigt index map. More...

static std::vector< std::vector< int > >	svIndex
	Symmetric Voigt index map. More...

Detailed Description

Implementation of the material model for steel relaxation given in Eurocode 2 (the same as in Model Code 2010) and in Ba{z}ant and Yu (J.

of Eng. Mech, 2013) which reduces to the first model under constant strain. At variable strain history the first model uses the approach employing the so-called {{equivalent time}} approach described in Annex D in the Eurocode 2. The current implementation takes into account only prestress losses due to steel relaxation, other losses (e.g. slip at anchorage, thermal dilation, friction, etc.) need to be treated separately. The same holds for the stress transfer from prestressing reinforcement to concrete in the region called {{transmission length}}. On the other hand, losses due to sequential prestressing, elastic deformation and both short-time and long-time creep and shrinkage are taken into account automatically provided that a suitable material model is chosen for concrete. See material manual and the above-mentioned documents for details.

Definition at line 80 of file steelrelaxmat.h.

Member Enumeration Documentation

enum oofem::SteelRelaxMat::approachType

protected

0 = approach according to Ba{z}ant and Yu, 1 = equivalent time approach according to Eurocode 2 and {{fib}} Model Code 2010

Enumerator
Bazant_EC2
EquivTime_EC2

Definition at line 125 of file steelrelaxmat.h.

Constructor & Destructor Documentation

oofem::SteelRelaxMat::SteelRelaxMat	(	int	n,
		Domain *	d
	)

Definition at line 49 of file steelrelaxmat.C.

References E, k1, k2, mu, rho1000, and timeFactor.

oofem::SteelRelaxMat::~SteelRelaxMat ( )

virtual

Definition at line 62 of file steelrelaxmat.C.

Member Function Documentation

void oofem::SteelRelaxMat::computeIncrOfPrestressLossAtVarStrain	(	double &	answer,
		GaussPoint *	gp,
		TimeStep *	tStep,
		double	stress
	)

implementation of cumulative time approach according to Eurocode to get prestress loss at variable strain

Definition at line 312 of file steelrelaxmat.C.

References charStrength, evalStressRelaxationAtConstStrain(), oofem::SteelRelaxMatStatus::giveRelaxIntVariable(), oofem::Material::giveStatus(), oofem::TimeStep::giveTimeIncrement(), k1, k2, mu, relRelaxBound, rho1000, oofem::SteelRelaxMatStatus::setPrestress(), oofem::SteelRelaxMatStatus::setTempRelaxIntVariable(), and timeFactor.

Referenced by giveRealStressVector(), and giveRealStressVector_1d().

void oofem::SteelRelaxMat::computeStressRelaxationStrainVector	(	FloatArray &	answer,
		GaussPoint *	gp,
		const FloatArray &	totalStrain,
		TimeStep *	tStep,
		ValueModeType	mode
	)

evaluates eigenstrain due to steel relaxation

Definition at line 361 of file steelrelaxmat.C.

References oofem::FloatArray::at(), charStrength, oofem::StructuralMaterial::computeStressIndependentStrainVector(), E, evalStressRelaxationAtConstStrain(), oofem::SteelRelaxMatStatus::givePrestress(), oofem::SteelRelaxMatStatus::giveRelaxIntVariable(), oofem::FloatArray::giveSize(), oofem::Material::giveStatus(), oofem::StructuralMaterialStatus::giveStrainVector(), oofem::StructuralMaterial::giveStressDependentPartOfStrainVector(), oofem::StructuralMaterialStatus::giveStressVector(), oofem::StructuralMaterialStatus::giveTempStressVector(), oofem::TimeStep::giveTimeIncrement(), k1, k2, mu, relRelaxBound, oofem::FloatArray::resize(), rho1000, oofem::SteelRelaxMatStatus::setPrestress(), oofem::SteelRelaxMatStatus::setTempRelaxIntVariable(), oofem::FloatArray::subtract(), and timeFactor.

Referenced by giveRealStressVector_1d(), and giveStressDependentPartOfStrainVector().

MaterialStatus * oofem::SteelRelaxMat::CreateStatus ( GaussPoint * gp ) const

virtual

Creates new copy of associated status and inserts it into given integration point.

Parameters

gp	Integration point where newly created status will be stored.

Returns: Reference to new status.

Reimplemented from oofem::Material.

Definition at line 146 of file steelrelaxmat.C.

References oofem::FEMComponent::giveDomain().

Referenced by giveClassName().

void oofem::SteelRelaxMat::evalStressRelaxationAtConstStrain	(	double &	answer,
		GaussPoint *	gp,
		double	dt
	)

computes steel relaxation (eurocode formula)

Definition at line 286 of file steelrelaxmat.C.

References charStrength, oofem::SteelRelaxMatStatus::givePrestress(), oofem::Material::giveStatus(), k1, k2, mu, relRelaxBound, rho1000, and timeFactor.

Referenced by computeIncrOfPrestressLossAtVarStrain(), computeStressRelaxationStrainVector(), and giveRealStressVector_1d().

void oofem::SteelRelaxMat::give1dStressStiffMtrx	(	FloatMatrix &	answer,
		MatResponseMode	mmode,
		GaussPoint *	gp,
		TimeStep *	tStep
	)

virtual

Method for computing 1d stiffness matrix of receiver.

Default implementation computes 3d stiffness matrix using give3dMaterialStiffnessMatrix and reduces it to 1d stiffness using reduce method described above. However, this reduction is quite time consuming and if it is possible, it is recommended to overload this method and provide direct method for computing particular stiffness matrix.

Parameters

answer	Stiffness matrix.
mmode	Material response mode.
gp	Integration point, which load history is used.
tStep	Time step (most models are able to respond only when tStep is current time step).

Reimplemented from oofem::StructuralMaterial.

Definition at line 251 of file steelrelaxmat.C.

References oofem::FloatMatrix::at(), E, oofem::Material::isActivated(), oofem::FloatMatrix::resize(), and oofem::FloatMatrix::zero().

Referenced by giveRealStressVector_1d().

virtual const char* oofem::SteelRelaxMat::giveClassName ( ) const

inlinevirtual

Returns: Class name of the receiver.

Reimplemented from oofem::StructuralMaterial.

Definition at line 172 of file steelrelaxmat.h.

References CreateStatus(), and giveIPValue().

virtual const char* oofem::SteelRelaxMat::giveInputRecordName ( ) const

inlinevirtual

Returns: Input record name of the receiver.

Implements oofem::FEMComponent.

Definition at line 171 of file steelrelaxmat.h.

References _IFT_SteelRelaxMat_Name.

int oofem::SteelRelaxMat::giveIPValue	(	FloatArray &	answer,
		GaussPoint *	gp,
		InternalStateType	type,
		TimeStep *	tStep
	)

virtual

Returns the integration point corresponding value in Reduced form.

Parameters

answer	Contain corresponding ip value, zero sized if not available.
gp	Integration point to which the value refers.
type	Determines the type of internal variable.
tStep	Determines the time step.

Returns: Nonzero if the assignment can be done, zero if this type of variable is not supported.

Reimplemented from oofem::StructuralMaterial.

Definition at line 468 of file steelrelaxmat.C.

References oofem::StructuralMaterial::giveIPValue().

Referenced by giveClassName().

void oofem::SteelRelaxMat::giveRealStressVector	(	FloatArray &	answer,
		GaussPoint *	gp,
		const FloatArray &	reducedStrain,
		TimeStep *	tStep
	)

virtual

Computes the real stress vector for given total strain and integration point.

The total strain is defined as strain computed directly from displacement field at given time. The stress independent parts (temperature, eigenstrains) are subtracted in constitutive driver. The service should use previously reached equilibrium history variables. Also it should update temporary history variables in status according to newly reached state. The temporary history variables are moved into equilibrium ones after global structure equilibrium has been reached by iteration process.

Parameters

answer	Stress vector in reduced form. For large deformations it is treated as the second Piola-Kirchoff stress.
gp	Integration point.
reducedStrain	Strain vector in reduced form. For large deformations it is treated as the Green-Lagrange strain.
tStep	Current time step (most models are able to respond only when tStep is current time step).

Todo:: Move this to StructuralCrossSection ?

Reimplemented from oofem::StructuralMaterial.

Definition at line 152 of file steelrelaxmat.C.

References Approach, oofem::FloatArray::at(), Bazant_EC2, oofem::FloatArray::beDifferenceOf(), charStrength, computeIncrOfPrestressLossAtVarStrain(), E, EquivTime_EC2, oofem::FloatArray::giveSize(), oofem::Material::giveStatus(), oofem::StructuralMaterialStatus::giveStrainVector(), giveStressDependentPartOfStrainVector(), oofem::StructuralMaterial::giveStressDependentPartOfStrainVector(), oofem::StructuralMaterialStatus::giveStressVector(), oofem::StructuralMaterialStatus::giveTempStressVector(), oofem::Material::isActivated(), oofem::StructuralMaterialStatus::letTempStrainVectorBe(), oofem::StructuralMaterialStatus::letTempStressVectorBe(), OOFEM_ERROR, OOFEM_WARNING, oofem::FloatArray::resize(), tolerance, and oofem::FloatArray::zero().

Referenced by giveRealStressVector_1d().

virtual void oofem::SteelRelaxMat::giveRealStressVector_1d	(	FloatArray &	answer,
		GaussPoint *	gp,
		const FloatArray &	reducedE,
		TimeStep *	tStep
	)

inlinevirtual

Default implementation relies on giveRealStressVector_StressControl.

Reimplemented from oofem::StructuralMaterial.

Definition at line 133 of file steelrelaxmat.h.

References computeIncrOfPrestressLossAtVarStrain(), computeStressRelaxationStrainVector(), evalStressRelaxationAtConstStrain(), give1dStressStiffMtrx(), giveRealStressVector(), giveStressDependentPartOfStrainVector(), and initializeFrom().

void oofem::SteelRelaxMat::giveStressDependentPartOfStrainVector	(	FloatArray &	answer,
		GaussPoint *	gp,
		const FloatArray &	totalStrain,
		TimeStep *	tStep,
		ValueModeType	mode
	)

virtual

evaluates stress-related strain - subtracts not only temperature strains but also strains caused by steel relaxation

Definition at line 267 of file steelrelaxmat.C.

References computeStressRelaxationStrainVector(), oofem::StructuralMaterial::giveStressDependentPartOfStrainVector(), and oofem::FloatArray::subtract().

Referenced by giveRealStressVector(), and giveRealStressVector_1d().

int oofem::SteelRelaxMat::hasMaterialModeCapability ( MaterialMode mode )

virtual

Tests if material supports material mode.

Parameters

mode	Required material mode.

Returns: Nonzero if supported, zero otherwise.

Reimplemented from oofem::StructuralMaterial.

Definition at line 67 of file steelrelaxmat.C.

Referenced by hasNonLinearBehaviour().

virtual int oofem::SteelRelaxMat::hasNonLinearBehaviour ( )

inlinevirtual

Returns nonzero if receiver is non linear.

Reimplemented from oofem::Material.

Definition at line 165 of file steelrelaxmat.h.

References hasMaterialModeCapability().

IRResultType oofem::SteelRelaxMat::initializeFrom ( InputRecord * ir )

virtual

Initializes receiver according to object description stored in input record.

This function is called immediately after creating object using constructor. Input record can be imagined as data record in component database belonging to receiver. Receiver may use value-name extracting functions to extract particular field from record.