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WilsonTheta.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: 1.4 $
00022 // $Date: 2003/02/14 23:00:49 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/WilsonTheta.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef WilsonTheta_h
00027 #define WilsonTheta_h
00028 
00029 // File: ~/analysis/integrator/WilsonTheta.h
00030 // 
00031 // Written: fmk 
00032 // Created: 11/98
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for WilsonTheta.
00036 // WilsonTheta is an algorithmic class for performing a transient analysis
00037 // using the WilsonTheta integration scheme.
00038 //
00039 // What: "@(#) WilsonTheta.h, revA"
00040 
00041 #include <TransientIntegrator.h>
00042 
00043 class DOF_Group;
00044 class FE_Element;
00045 class Vector;
00046 
00047 class WilsonTheta : public TransientIntegrator
00048 {
00049   public:
00050     WilsonTheta();
00051     WilsonTheta(double theta);
00052     WilsonTheta(double theta, double alphaM, double betaK, double betaKi, double betaKc);    
00053     ~WilsonTheta();
00054 
00055     // methods which define what the FE_Element and DOF_Groups add
00056     // to the system of equation object.
00057     int formEleTangent(FE_Element *theEle);
00058     int formNodTangent(DOF_Group *theDof);        
00059 
00060     int domainChanged(void);    
00061     int newStep(double deltaT);    
00062     int update(const Vector &deltaU);
00063     int commit(void);
00064 
00065     virtual int sendSelf(int commitTag, Channel &theChannel);
00066     virtual int recvSelf(int commitTag, Channel &theChannel, 
00067                          FEM_ObjectBroker &theBroker);
00068 
00069     void Print(OPS_Stream &s, int flag =0);        
00070     
00071   protected:
00072     
00073   private:
00074     double theta;    
00075     double deltaT;
00076 
00077     double alphaM, betaK, betaKi, betaKc;
00078     double c1, c2, c3;  // some constants we need to keep
00079     Vector *Ut, *Utdot, *Utdotdot; // response quantities at time t
00080     Vector *U, *Udot, *Udotdot; // response quantities at time t+deltat
00081 };
00082 
00083 #endif
00084

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