OpenSees » SRC » analysis » integrator

Newmark1.h

Go to the documentation of this file.
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: 1.5 $
00022 // $Date: 2003/02/14 23:00:49 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/Newmark1.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef Newmark1_h
00027 #define Newmark1_h
00028 
00029 // File: ~/analysis/integrator/Newmark1.h
00030 // 
00031 // Written: fmk 
00032 // Created: 11/98
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for Newmark1.
00036 // Newmark1 is an algorithmic class for performing a transient analysis
00037 // using the Newmark1 integration scheme.
00038 //
00039 // What: "@(#) Newmark1.h, revA"
00040 
00041 #include <TransientIntegrator.h>
00042 
00043 class DOF_Group;
00044 class FE_Element;
00045 class Vector;
00046 
00047 class Newmark1 : public TransientIntegrator
00048 {
00049   public:
00050     Newmark1();
00051     Newmark1(double gamma, double beta, bool disp = true);
00052     Newmark1(double gamma, double beta, double alphaM, double betaK, double betaKi, double betaKc); 
00053 
00054     ~Newmark1();
00055 
00056     // methods which define what the FE_Element and DOF_Groups add
00057     // to the system of equation object.
00058     int formEleTangent(FE_Element *theEle);
00059     int formNodTangent(DOF_Group *theDof);        
00060 
00061     int domainChanged(void);    
00062     int initialize(void);    
00063     int newStep(double deltaT);    
00064     int revertToLastStep(void);            
00065     int update(const Vector &deltaU);
00066 
00067     virtual int sendSelf(int commitTag, Channel &theChannel);
00068     virtual int recvSelf(int commitTag, Channel &theChannel, 
00069                          FEM_ObjectBroker &theBroker);
00070 
00071     void Print(OPS_Stream &s, int flag =0);        
00072     
00073   protected:
00074     
00075   private:
00076     double gamma;
00077     double beta;
00078 
00079     double alphaM, betaK, betaKi, betaKc;
00080     double c1, c2, c3, c4;  // some constants we need to keep
00081     Vector *Up, *Updot;      // predicted response quantities at time t+deltat for 1st iter 
00082     Vector *U, *Udot, *Udotdot; //response quantities at time t+deltat = predicted + corrected
00083         
00084 };
00085 
00086 #endif
00087

Generated on Mon Oct 23 15:04:59 2006 for OpenSees by doxygen 1.5.0