Newmark.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: 1.8 $ 00022 // $Date: 2005/12/19 22:43:36 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/Newmark.h,v $ 00024 00025 00026 #ifndef Newmark_h 00027 #define Newmark_h 00028 00029 // Written : fmk 00030 // Created : 11/98 00031 // Modified: 02/05 ahs 00032 // Revision: A 00033 // 00034 // Description: This file contains the class definition for Newmark. 00035 // Newmark is an algorithmic class for performing a transient analysis 00036 // using the Newmark integration scheme. 00037 // 00038 // What: "@(#) Newmark.h, revA" 00039 00040 #include <TransientIntegrator.h> 00041 00042 class DOF_Group; 00043 class FE_Element; 00044 class Vector; 00045 00046 class Newmark : public TransientIntegrator 00047 { 00048 public: 00049 // constructors 00050 Newmark(); 00051 Newmark(double gamma, double beta, bool disp = true); 00052 Newmark(double gamma, double beta, double alphaM, double betaK, 00053 double betaKi, double betaKc, bool disp = true); 00054 00055 // destructor 00056 ~Newmark(); 00057 00058 // methods which define what the FE_Element and DOF_Groups add 00059 // to the system of equation object. 00060 int formEleTangent(FE_Element *theEle); 00061 int formNodTangent(DOF_Group *theDof); 00062 00063 int domainChanged(void); 00064 int newStep(double deltaT); 00065 int revertToLastStep(void); 00066 int update(const Vector &deltaU); 00067 00068 virtual int sendSelf(int commitTag, Channel &theChannel); 00069 virtual int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker); 00070 00071 void Print(OPS_Stream &s, int flag = 0); 00072 00073 // AddingSensitivity:BEGIN ////////////////////////////////// 00074 int revertToStart(); 00075 // AddingSensitivity:END //////////////////////////////////// 00076 00077 protected: 00078 bool displ; // a flag indicating whether displ or accel increments 00079 double gamma; 00080 double beta; 00081 00082 // rayleigh damping factors 00083 double alphaM; 00084 double betaK; 00085 double betaKi; 00086 double betaKc; 00087 00088 double c1, c2, c3; // some constants we need to keep 00089 Vector *Ut, *Utdot, *Utdotdot; // response quantities at time t 00090 Vector *U, *Udot, *Udotdot; // response quantities at time t+deltaT 00091 bool determiningMass; // flag to check if just want the mass contribution 00092 00093 private: 00094 }; 00095 00096 #endif
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