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LoadControl.h

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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: 2003/02/14 23:00:48 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/LoadControl.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef LoadControl_h
00027 #define LoadControl_h
00028 
00029 // File: ~/analysis/integrator/LoadControl.h
00030 // 
00031 // Written: fmk 
00032 // Created: 07/98
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for LoadControl.
00036 // LoadControl is an algorithmic class for perfroming a static analysis
00037 // using a load control integration scheme.
00038 //
00039 // What: "@(#) LoadControl.h, revA"
00040 
00041 #include <StaticIntegrator.h>
00042 
00043 class LinearSOE;
00044 class AnalysisModel;
00045 class FE_Element;
00046 class Vector;
00047 
00048 class LoadControl : public StaticIntegrator
00049 {
00050   public:
00051     LoadControl(double deltaLambda, int numIncr, 
00052                 double minLambda, double maxlambda);
00053 
00054     ~LoadControl();
00055 
00056     int newStep(void);    
00057     int update(const Vector &deltaU);
00058     int setDeltaLambda(double newDeltaLambda);
00059 
00060     // Public methods for Output
00061     int sendSelf(int commitTag, Channel &theChannel);
00062     int recvSelf(int commitTag, Channel &theChannel, 
00063                          FEM_ObjectBroker &theBroker);
00064 
00065     void Print(OPS_Stream &s, int flag =0);    
00066     
00067   protected:
00068     
00069   private:
00070     double deltaLambda;  // dlambda at step (i-1)
00071     
00072     double specNumIncrStep, numIncrLastStep; // Jd & J(i-1) 
00073     double dLambdaMin, dLambdaMax; // min & max values for dlambda at step (i) 
00074 };
00075 
00076 #endif
00077

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