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00001 /* ****************************************************************** **
00002 **    OpenSees - Open System for Earthquake Engineering Simulation    **
00003 **          Pacific Earthquake Engineering Research Center            **
00004 **                                                                    **
00005 **                                                                    **
00006 ** (C) Copyright 1999, The Regents of the University of California    **
00007 ** All Rights Reserved.                                               **
00008 **                                                                    **
00009 ** Commercial use of this program without express permission of the   **
00010 ** University of California, Berkeley, is strictly prohibited.  See   **
00011 ** file 'COPYRIGHT'  in main directory for information on usage and   **
00012 ** redistribution,  and for a DISCLAIMER OF ALL WARRANTIES.           **
00013 **                                                                    **
00014 ** Developed by:                                                      **
00015 **   Frank McKenna (fmckenna@ce.berkeley.edu)                         **
00016 **   Gregory L. Fenves (fenves@ce.berkeley.edu)                       **
00017 **   Filip C. Filippou (filippou@ce.berkeley.edu)                     **
00018 **                                                                    **
00019 ** ****************************************************************** */
00020                                                                         
00021 // $Revision: 1.3 $
00022 // $Date: 2001/03/29 05:23:32 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/IncrementalIntegrator.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef IncrementalIntegrator_h
00027 #define IncrementalIntegrator_h
00028 
00029 // File: ~/analysis/integrator/IncrementalIntegrator.h
00030 // 
00031 // Written: fmk 
00032 // Created: Tue Sept 17 15:54:47: 1996
00033 // Revision: A
00034 //
00035 // Description: This file contains the interface for IncrementalIntegrator. 
00036 // IncrementalIntegrator is an algorithmic class for setting up the finite 
00037 // element equations in an incremental analysis and for updating the nodal
00038 // response quantities based on the values in the soln vector.
00039 //
00040 // What: "@(#) IncrementalIntegrator.h, revA"
00041 
00042 #include <Integrator.h>
00043 
00044 #ifndef _bool_h
00045 #include <bool.h>
00046 #endif
00047 
00048 #include <LinearSOE.h>
00049 #include <AnalysisModel.h>
00050 #include <FE_Element.h>
00051 #include <DOF_Group.h>
00052 #include <Vector.h>
00053 
00054 #define CURRENT_TANGENT 0
00055 #define INITIAL_TANGENT 1
00056 #define CURRENT_SECANT  2
00057 
00058 
00072 class IncrementalIntegrator : public Integrator
00073 {
00074   public:
00080     IncrementalIntegrator(int classTag);
00081 
00085     virtual ~IncrementalIntegrator();
00086 
00087 
00094     virtual void setLinks(AnalysisModel &theModel,
00095 
00096      LinearSOE &theSOE);
00097 
00099     virtual int  formTangent(int statusFlag = CURRENT_TANGENT);    
00105     virtual int  formUnbalance(void);        
00106 
00107 
00109     virtual int formEleTangent(FE_Element *theEle) =0;
00116     virtual int formNodTangent(DOF_Group *theDof) =0;    
00117 
00119     virtual int formEleResidual(FE_Element *theEle) =0;
00120 
00122     virtual int formNodUnbalance(DOF_Group *theDof) =0;    
00123 
00125     virtual int update(const Vector &deltaU) =0;
00127     virtual int commit(void);
00129     virtual int revertToLastStep(void);
00131     virtual int initialize(void);
00132     
00134     virtual int getLastResponse(Vector &result, const ID &id);
00135 
00136     
00137   protected:
00139     LinearSOE *getLinearSOEPtr(void) const;
00141     AnalysisModel *getAnalysisModelPtr(void) const;
00143     virtual int  formNodalUnbalance(void);        
00145     virtual int  formElementResidual(void);            
00147     int statusFlag;
00148     
00149   private:
00151     LinearSOE *theSOE;
00153     AnalysisModel *theAnalysisModel;
00154 };
00155 
00156 #endif
00157