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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: 1.2 $
00022 // $Date: 2001/02/17 06:36:13 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/MinUnbalDispNorm.h,v $
00024                                                                         
00025                                                                         
00026 // File: ~/analysis/integrator/MinUnbalDispNorm.h
00027 // 
00028 // Written: fmk 
00029 // Created: 07/99
00030 // Revision: A
00031 //
00032 // Description: This file contains the class definition for MinUnbalDispNorm.
00033 // MinUnbalDispNorm is an algorithmic class for perfroming a static analysis
00034 // using the minimum unbalanced displacement norm (Chan IJNME 26(2657:2669)1988
00035 //
00036 // What: "@(#) MinUnbalDispNorm.h, revA"
00037 
00038 #ifndef MinUnbalDispNorm_h
00039 #define MinUnbalDispNorm_h
00040 
00041 #include <StaticIntegrator.h>
00042 
00043 #include <LinearSOE.h>
00044 #include <AnalysisModel.h>
00045 #include <FE_Element.h>
00046 #include <Vector.h>
00047 
00048 #define SIGN_LAST_STEP      1
00049 #define CHANGE_DETERMINANT  2
00050 
00061 class MinUnbalDispNorm : public StaticIntegrator
00062 {
00063   public:
00072     MinUnbalDispNorm(double lambda1, int specNumIterStep, 
00073 
00074        double dlambda1min, double dlambda1max,
00075        int signFirstStepMethod = SIGN_LAST_STEP);
00076 
00080     ~MinUnbalDispNorm();
00081 
00082 
00086     int newStep(void);    
00087 
00091     int update(const Vector &deltaU);
00092 
00094     int domainChanged(void);
00095 
00096     
00098     int sendSelf(int commitTag, Channel &theChannel);
00100     int recvSelf(int commitTag, Channel &theChannel, 
00101     FEM_ObjectBroker &theBroker);
00102 
00104     void Print(ostream &s, int flag =0);    
00105     
00106   protected:
00107     
00108   private:
00110     double dLambda1LastStep;                  
00111     double specNumIncrStep, numIncrLastStep;    
00112 
00113     Vector *deltaUhat, *deltaUbar, *deltaU, *deltaUstep; 
00114     Vector *phat;                                   
00115 
00116     double deltaLambdaStep, currentLambda; 
00117     int signLastDeltaLambdaStep;           
00118     double dLambda1min, dLambda1max;       
00119     double signLastDeterminant;
00121     int signFirstStepMethod;
00122 };
00123 
00124 #endif
00125