IncrementalIntegrator is an algorithmic class for setting up the finite element equations in an incremental analysis and for updating the nodal response quantities based on the values in the solution vector. More...

#include <IncrementalIntegrator.h>

Inheritance diagram for XC::IncrementalIntegrator:

Public Member Functions
virtual int	formTangent (int statusFlag=CURRENT_TANGENT)
	Builds tangent stiffness matrix. More...

virtual int	formUnbalance (void)
	Builds the unbalanced load vector (right hand side of the equation). More...

virtual int	formEleTangent (FE_Element *theEle)=0
	To inform the FE_Element how to build its tangent matrix for addition to the system of equations. More...

virtual int	formNodTangent (DOF_Group *theDof)=0
	To inform the DOF_Group how to build its tangent matrix for addition to the system of equations. More...

virtual int	formEleResidual (FE_Element *theEle)=0
	To inform the FE_Element how to build its residual vector for addition to the system of equations. More...

virtual int	formNodUnbalance (DOF_Group *theDof)=0
	To inform the DOF_Group how to build its residual vector for addition to the system of equations. More...

virtual int	newStep (double deltaT)
	Invoked to inform the integrator that the transient analysis is proceeding to the next time step. More...

virtual int	update (const Vector &deltaU)=0
	When invoked causes the integrator object to update the DOF_Group responses with the appropriate values based on the computed solution to the system of equations object. More...

virtual int	commit (void)
	Invoked by the SolutionAlgorithm to inform the Integrator that current state of domain is on solution path. More...

virtual int	revertToLastStep (void)

virtual int	initialize (void)

virtual int	revertToStart ()

virtual int	getLastResponse (Vector &result, const ID &id)
	Returns the response on the DOFs being passed as parameter. More...

Public Member Functions inherited from XC::Integrator
virtual int	domainChanged (void)
	Make required changes when a change in the domain occurs. More...

virtual void	Print (std::ostream &s, int flag=0)
	The Integrator is to send information to the stream based on the integer `flag`. More...

Public Member Functions inherited from XC::MovableObject
	MovableObject (int classTag, int dbTag)
	Constructor. More...

	MovableObject (int classTag)
	Constructor. More...

	MovableObject (const MovableObject &)
	Copy constructor. Doesn't copy the dbTag.

MovableObject &	operator= (const MovableObject &)
	Assignment operator. Doesn't copy the dbTag.

int	getClassTag (void) const
	Return the class identifier.

int	getDbTag (void) const
	Return the object identifier in the database.

int	getDbTag (CommParameters &)
	Return the object identifier in the database.

void	setDbTag (int dbTag)
	Sets the object identifier in the database.

void	setDbTag (CommParameters &)
	Sets the object identifier in the database if not already set. More...

virtual int	sendSelf (CommParameters &cp)=0
	Send the object. More...

virtual int	recvSelf (const CommParameters &cp)=0
	Receive the object. More...

virtual int	setParameter (const std::vector< std::string > &argv, Parameter &param)
	Sets the value `param` to the parameter `argv`.

virtual int	updateParameter (int parameterID, Information &info)
	Updates the parameter identified by `parameterID` with `info`.

virtual int	activateParameter (int parameterID)
	Activates the parameter identified by `parameterID`.

virtual int	setVariable (const std::string &variable, Information &)
	Set the value of the variable idenfified by `var`.

virtual int	getVariable (const std::string &variable, Information &)
	Return the value of the variable idenfified by `var`.

Public Member Functions inherited from XC::DistributedBase
	DistributedBase (void)
	Constructor.

virtual DbTagData &	getDbTagData (void) const
	Returns a vector to store class dbTags.

const int &	getDbTagDataPos (const int &i) const
	Returns the data at the i-th position.

void	setDbTagDataPos (const int &i, const int &v)
	Sets the data at the i-th position.

void	inicComm (const int &dataSize) const
	Initializes communication.

Protected Member Functions
LinearSOE *	getLinearSOEPtr (void)
	Returns a pointer to the linear system of equations. More...

const LinearSOE *	getLinearSOEPtr (void) const
	Returns a pointer to the linear system of equations. More...

virtual int	formNodalUnbalance (void)
	Builds the nodal unbalanced load vector. More...

	IncrementalIntegrator (AnalysisAggregation *, int classTag)
	Constructor. More...


virtual int	formElementResidual (void)
	Builds the unbalanced load vector of the elements. More...

Protected Member Functions inherited from XC::Integrator
AnalysisAggregation *	getAnalysisAggregation (void)
	Returns a pointer to the solution method that owns this object.

const AnalysisAggregation *	getAnalysisAggregation (void) const
	Returns a const pointer to the solution method that owns this object.

void	applyLoadModel (double newTime)

int	updateModel (void)

int	updateModel (double newTime, double dT)

int	commitModel (void)

double	getCurrentModelTime (void)

void	setCurrentModelTime (const double &t)

void	setRayleighDampingFactors (const RayleighDampingFactors &rF)

int	sendData (CommParameters &)
	Send object members through the channel being passed as parameter.

int	recvData (const CommParameters &)
	Receives object members through the channel being passed as parameter.

virtual AnalysisModel *	getAnalysisModelPtr (void)
	Returns a pointer to the analysis model. More...

virtual const AnalysisModel *	getAnalysisModelPtr (void) const
	Returns a pointer to the analysis model. More...

	Integrator (AnalysisAggregation *, int classTag)
	Constructor. More...

virtual Integrator *	getCopy (void) const =0

Protected Attributes
int	statusFlag

Friends
class	IntegratorVectors

Detailed Description

IncrementalIntegrator is an algorithmic class for setting up the finite element equations in an incremental analysis and for updating the nodal response quantities based on the values in the solution vector.

IncrementalIntegrator is an abstract class. A subclass of it is used when performing a static or transient analysis using an incremental displacement approach. Subclasses of IncrementalIntegrators provide methods informing the FE_Element and DOF_Group objects how to build the tangent and residual matrices and vectors. They also provide the method for updating the response quantities at the DOFs with appropriate values; these values being some function of the solution to the linear system of equations.

Constructor & Destructor Documentation

§ IncrementalIntegrator()

XC::IncrementalIntegrator::IncrementalIntegrator	(	AnalysisAggregation *	owr,
		int	clasTag
	)

protected

Constructor.

Parameters

owr	set of objects used to perform the analysis.

Member Function Documentation

§ commit()

int XC::IncrementalIntegrator::commit ( void )

virtual

Invoked by the SolutionAlgorithm to inform the Integrator that current state of domain is on solution path.

Invoked by the SolutionAlgorithm to inform the Integrator that current state of domain is on solution path. Returns the result of invoking commitDomain() on the AnalysisModel object associated with the Integrator.

Reimplemented in XC::DisplacementControl.

§ formElementResidual()

int XC::IncrementalIntegrator::formElementResidual ( void )

protectedvirtual

Builds the unbalanced load vector of the elements.

Invoked to form residual vector (the C vector in theSOE). The method iterates twice over the FE_elements in the AnalysisModel, the first time telling the FE_Elements top form their residual and the second time to add this residual to the LinearSOE objects \(b\) vector, i.e. it performs the following: {tabbing} while \= + while \= while \= FE_EleIter &theEles = theAnalysisModel.getFEs(); while((elePtr = theEles()) \(\neq\) 0) + theSOE.addA(elePtr- \(>\)getResidual(this), elePtr- \(>\)getID()) + {tabbing} Returns \(0\) if successful, otherwise a warning message is printed and a negative number is returned if an error occurs. Note, no test is made to ensure setLinks() has been invoked.

§ formEleResidual()

virtual int XC::IncrementalIntegrator::formEleResidual ( FE_Element * theEle )

pure virtual

To inform the FE_Element how to build its residual vector for addition to the system of equations.

Implements XC::Integrator.

Implemented in XC::StaticIntegrator, and XC::StaticSensitivityIntegrator.

§ formEleTangent()

virtual int XC::IncrementalIntegrator::formEleTangent ( FE_Element * theEle )

pure virtual

To inform the FE_Element how to build its tangent matrix for addition to the system of equations.

Implements XC::Integrator.

Implemented in XC::StaticIntegrator.

§ formNodalUnbalance()

int XC::IncrementalIntegrator::formNodalUnbalance ( void )

protectedvirtual

Builds the nodal unbalanced load vector.

The method first loops over all the DOF_Group objects telling them to form their unbalance and then adds this Vector to the \(b\) vector of the LinearSOE object, i.e. it performs the following: {tabbing} while \= + while \= while \= DOF_EleIter &theDofs = theAnalysisModel.getDOFs(); theSOE.zeroB(); while((dofGroupPtr = theDofs()) \(\neq\) 0) + theSOE.addB(dofGroupPtr- \(>\)getUnbalance(theIntegrator), dofGroupPtr- \(>\)getID()) {tabbing} Returns \(0\) if successful, otherwise a negative number is returned and a warning message is printed if an error occurred. Note, no test is made to ensure setLinks() has been invoked.

§ formNodTangent()

virtual int XC::IncrementalIntegrator::formNodTangent ( DOF_Group * theDof )

pure virtual

To inform the DOF_Group how to build its tangent matrix for addition to the system of equations.

The subclasses must provide the implementation of this method. This is required in transient analysis as th Node objects have mass. THIS MAY CHANGE.

Implements XC::Integrator.

Implemented in XC::StaticIntegrator.

§ formNodUnbalance()

virtual int XC::IncrementalIntegrator::formNodUnbalance ( DOF_Group * theDof )

pure virtual

To inform the DOF_Group how to build its residual vector for addition to the system of equations.

Implements XC::Integrator.

Implemented in XC::StaticIntegrator.

§ formTangent()

int XC::IncrementalIntegrator::formTangent ( int statFlag = CURRENT_TANGENT )

virtual

Builds tangent stiffness matrix.

Invoked to form the structure tangent matrix. The method first loops over all the FE_Elements in the AnalysisModel telling them to form their tangent and then it loops over the FE_Elements again adding the tangent to the LinearSOE objects A matrix. It performs the following: {tabbing} while \= + while \= while \= FE_EleIter &theEles = theAnalysisModel.getFEs(); theSOE.zeroA(); while((elePtr = theEles1()) \(\neq\) 0) + if (theSOE.addA(elePtr- \(>\)getTangent(this), elePtr- \(>\)getID(), \(1.0\)) \(<\) 0) + return \(-1\); -- {tabbing} Returns \(0\) if successful, otherwise an error message is printed an a \(-1\) is returned if setLinks() has not been called, or \(-2\) if failure to add an FE_Elements tangent to the LinearSOE. The two loops are introduced to allow for efficient parallel programming. THIS MAY CHANGE TO REDUCE MEMORY DEMANDS.

§ formUnbalance()

int XC::IncrementalIntegrator::formUnbalance ( void )

virtual

Builds the unbalanced load vector (right hand side of the equation).

Invoked to form the unbalance. The method fist zeros out the \(B\) vector of the LinearSOE object and then invokes formElementResidual() and formNodalUnbalance() on itself. {tabbing} while \= + while \= while \= theSOE.zeroB(); this- \(>\)fromElementResidual(); this- \(>\)formNodalUnbalance() {tabbing}

If an error occurs in either of these two methods or if {setLinks()} has not been called, an error message is printed and a negative number is returned. Returns \(0\) if successful.

§ getLastResponse()

int XC::IncrementalIntegrator::getLastResponse	(	Vector &	result,
		const ID &	id
	)

virtual

Returns the response on the DOFs being passed as parameter.

Returns in result values for the last solution to the system of equation object whose location in the solution vector is given by {id}. For a location specified by a negative integer in id 0.0 will be returned in result. Returns a \(0\) if successful, a warning message and a negative number is returned if an error occurs. \(-1\) if setSize() has not been called and a \(-2\) if location in id is greater than \(order-1\) of \(b\) vector.

Parameters

id	dofs identifiers on wich the response is requested.
result	respones values.

Implements XC::Integrator.

§ getLinearSOEPtr() [1/2]

XC::LinearSOE * XC::IncrementalIntegrator::getLinearSOEPtr ( void )

protected

Returns a pointer to the linear system of equations.

A member function which returns a pointer to the LinearSOE associated with the IncrementalIntegrator object, i.e. theSOE.

§ getLinearSOEPtr() [2/2]

const XC::LinearSOE * XC::IncrementalIntegrator::getLinearSOEPtr ( void ) const

protected

Returns a pointer to the linear system of equations.

A const member function which returns a const pointer to the LinearSOE associated with the IncrementalIntegrator object, i.e. theSOE.

§ newStep()

int XC::IncrementalIntegrator::newStep ( double deltaT )

virtual

Invoked to inform the integrator that the transient analysis is proceeding to the next time step.

??

To return \(0\) if successful, a negative number if not.

§ update()

virtual int XC::IncrementalIntegrator::update ( const Vector & deltaU )

pure virtual

When invoked causes the integrator object to update the DOF_Group responses with the appropriate values based on the computed solution to the system of equations object.

Implemented in XC::LoadControl, XC::DisplacementControl, XC::LoadPath, XC::MinUnbalDispNorm, XC::DistributedDisplacementControl, XC::StaticSensitivityIntegrator, and XC::ProtoArcLength.

The documentation for this class was generated from the following files:

src/solution/analysis/integrator/IncrementalIntegrator.h
src/solution/analysis/integrator/IncrementalIntegrator.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

§ IncrementalIntegrator()

Member Function Documentation

§ commit()

§ formElementResidual()

§ formEleResidual()

§ formEleTangent()

§ formNodalUnbalance()

§ formNodTangent()

§ formNodUnbalance()

§ formTangent()

§ formUnbalance()

§ getLastResponse()

§ getLinearSOEPtr() [1/2]

§ getLinearSOEPtr() [2/2]

§ newStep()

§ update()