HHTExplicit.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: 1.2 $ 00022 // $Date: 2005/12/21 00:32:57 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/HHTExplicit.h,v $ 00024 00025 00026 #ifndef HHTExplicit_h 00027 #define HHTExplicit_h 00028 00029 // File: ~/analysis/integrator/HHTExplicit.h 00030 // 00031 // Written: Andreas Schellenberg (andreas.schellenberg@gmx.net) 00032 // Created: 02/05 00033 // Revision: A 00034 // 00035 // Description: This file contains the class definition for HHTExplicit. 00036 // HHTExplicit is an algorithmic class for performing a transient analysis 00037 // using the HHTExplicit integration scheme (beta = 0). 00038 // 00039 // What: "@(#) HHTExplicit.h, revA" 00040 00041 #include <TransientIntegrator.h> 00042 00043 class DOF_Group; 00044 class FE_Element; 00045 class Vector; 00046 00047 class HHTExplicit : public TransientIntegrator 00048 { 00049 public: 00050 // constructors 00051 HHTExplicit(); 00052 HHTExplicit(double alpha); 00053 HHTExplicit(double alpha, 00054 double alphaM, double betaK, double betaKi, double betaKc); 00055 HHTExplicit(double alpha, double gamma); 00056 HHTExplicit(double alpha, double gamma, 00057 double alphaM, double betaK, double betaKi, double betaKc); 00058 00059 // destructor 00060 ~HHTExplicit(); 00061 00062 // methods which define what the FE_Element and DOF_Groups add 00063 // to the system of equation object. 00064 int formEleTangent(FE_Element *theEle); 00065 int formNodTangent(DOF_Group *theDof); 00066 00067 int domainChanged(void); 00068 int newStep(double deltaT); 00069 int revertToLastStep(void); 00070 int update(const Vector &aiPlusOne); 00071 int commit(void); 00072 00073 virtual int sendSelf(int commitTag, Channel &theChannel); 00074 virtual int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker); 00075 00076 void Print(OPS_Stream &s, int flag = 0); 00077 00078 protected: 00079 00080 private: 00081 double alpha; 00082 double gamma; 00083 double deltaT; 00084 00085 // rayleigh damping factors 00086 double alphaM; 00087 double betaK; 00088 double betaKi; 00089 double betaKc; 00090 00091 int updateCount; // method should only have one update per step 00092 double c2, c3; // some constants we need to keep 00093 Vector *Ut, *Utdot, *Utdotdot; // response quantities at time t 00094 Vector *U, *Udot, *Udotdot; // response quantities at time t + deltaT 00095 Vector *Ualpha, *Ualphadot; // response quantities at time t+alpha*deltaT 00096 }; 00097 00098 #endif
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