HHT.hGo 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: 1.7 $ 00022 // $Date: 2005/12/19 22:43:36 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/HHT.h,v $ 00024 00025 00026 #ifndef HHT_h 00027 #define HHT_h 00028 00029 // Written: Andreas Schellenberg (andreas.schellenberg@gmx.net) 00030 // Created: 02/05 00031 // Revision: A 00032 // 00033 // Description: This file contains the class definition for HHT. 00034 // HHT is an algorithmic class for performing a transient analysis 00035 // using the HHT integration scheme. 00036 // 00037 // What: "@(#) HHT.h, revA" 00038 00039 #include <TransientIntegrator.h> 00040 00041 class DOF_Group; 00042 class FE_Element; 00043 class Vector; 00044 00045 class HHT : public TransientIntegrator 00046 { 00047 public: 00048 // constructors 00049 HHT(); 00050 HHT(double alpha); 00051 HHT(double alpha, 00052 double alphaM, double betaK, double betaKi, double betaKc); 00053 HHT(double alpha, double beta, double gamma); 00054 HHT(double alpha, double beta, double gamma, 00055 double alphaM, double betaK, double betaKi, double betaKc); 00056 00057 // destructor 00058 ~HHT(); 00059 00060 // methods which define what the FE_Element and DOF_Groups add 00061 // to the system of equation object. 00062 int formEleTangent(FE_Element *theEle); 00063 int formNodTangent(DOF_Group *theDof); 00064 00065 int domainChanged(void); 00066 int newStep(double deltaT); 00067 int revertToLastStep(void); 00068 int update(const Vector &deltaU); 00069 int commit(void); 00070 00071 virtual int sendSelf(int commitTag, Channel &theChannel); 00072 virtual int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker); 00073 00074 void Print(OPS_Stream &s, int flag = 0); 00075 00076 protected: 00077 00078 private: 00079 double alpha; 00080 double beta; 00081 double gamma; 00082 double deltaT; 00083 00084 // rayleigh damping factors 00085 double alphaM; 00086 double betaK; 00087 double betaKi; 00088 double betaKc; 00089 00090 double c1, c2, c3; // some constants we need to keep 00091 Vector *Ut, *Utdot, *Utdotdot; // response quantities at time t 00092 Vector *U, *Udot, *Udotdot; // response quantities at time t + deltaT 00093 Vector *Ualpha, *Ualphadot; // response quantities at time t+alpha*deltaT 00094 }; 00095 00096 #endif
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