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Newmark.cpp Go to the documentation of this file. /* ****************************************************************** ** ** OpenSees - Open System for Earthquake Engineering Simulation ** ** Pacific Earthquake Engineering Research Center ** ** ** ** ** ** (C) Copyright 1999, The Regents of the University of California ** ** All Rights Reserved. ** ** ** ** Commercial use of this program without express permission of the ** ** University of California, Berkeley, is strictly prohibited. See ** ** file 'COPYRIGHT' in main directory for information on usage and ** ** redistribution, and for a DISCLAIMER OF ALL WARRANTIES. ** ** ** ** Developed by: ** ** Frank McKenna (fmckenna@ce.berkeley.edu) ** ** Gregory L. Fenves (fenves@ce.berkeley.edu) ** ** Filip C. Filippou (filippou@ce.berkeley.edu) ** ** ** ** ****************************************************************** */ // $Revision: 1.15 $ // $Date: 2006/02/27 23:31:50 $ // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/Newmark.cpp,v $ // File: ~/analysis/integrator/Newmark.C // // Written: fmk // Created: 11/98 // Revision: A // // Description: This file contains the implementation of the Newmark class. // // What: "@(#) Newmark.C, revA" #include <Newmark.h> #include <FE_Element.h> #include <LinearSOE.h> #include <AnalysisModel.h> #include <Vector.h> #include <DOF_Group.h> #include <DOF_GrpIter.h> #include <AnalysisModel.h> #include <Channel.h> #include <FEM_ObjectBroker.h> Newmark::Newmark() :TransientIntegrator(INTEGRATOR_TAGS_Newmark), displ(true), gamma(0), beta(0), alphaM(0.0), betaK(0.0), betaKi(0.0), betaKc(0.0), c1(0.0), c2(0.0), c3(0.0), Ut(0), Utdot(0), Utdotdot(0), U(0), Udot(0), Udotdot(0), determiningMass(false) { } Newmark::Newmark(double theGamma, double theBeta, bool dispFlag) :TransientIntegrator(INTEGRATOR_TAGS_Newmark), displ(dispFlag), gamma(theGamma), beta(theBeta), alphaM(0.0), betaK(0.0), betaKi(0.0), betaKc(0.0), c1(0.0), c2(0.0), c3(0.0), Ut(0), Utdot(0), Utdotdot(0), U(0), Udot(0), Udotdot(0), determiningMass(false) { } Newmark::Newmark(double theGamma, double theBeta, double alpham, double betak, double betaki, double betakc, bool dispFlag) :TransientIntegrator(INTEGRATOR_TAGS_Newmark), displ(dispFlag), gamma(theGamma), beta(theBeta), alphaM(alpham), betaK(betak), betaKi(betaki), betaKc(betakc), c1(0.0), c2(0.0), c3(0.0), Ut(0), Utdot(0), Utdotdot(0), U(0), Udot(0), Udotdot(0), determiningMass(false) { } Newmark::~Newmark() { // clean up the memory created if (Ut != 0) delete Ut; if (Utdot != 0) delete Utdot; if (Utdotdot != 0) delete Utdotdot; if (U != 0) delete U; if (Udot != 0) delete Udot; if (Udotdot != 0) delete Udotdot; } int Newmark::newStep(double deltaT) { if (beta == 0 || gamma == 0 ) { opserr << "Newton::newStep() - error in variable\n"; opserr << "gamma = " << gamma << " beta= " << beta << endln; return -1; } // get a pointer to the AnalysisModel AnalysisModel *theModel = this->getAnalysisModelPtr(); if (displ == true) { if (deltaT <= 0.0) { opserr << "Newton::newStep() - error in variable\n"; opserr << "dT = " << deltaT << endln; return -2; } c1 = 1.0; c2 = gamma/(beta*deltaT); c3 = 1.0/(beta*deltaT*deltaT); } else { c1 = beta*deltaT*deltaT; c2 = gamma*deltaT; c3 = 1.0; } if (U == 0) { opserr << "Newton::newStep() - domainChange() failed or hasn't been called\n"; return -3; } // set response at t to be that at t+delta t of previous step (*Ut) = *U; (*Utdot) = *Udot; (*Utdotdot) = *Udotdot; if (displ == true) { // set new velocity and accelerations at t + delta t double a1 = (1.0 - gamma/beta); double a2 = (deltaT)*(1.0 - 0.5*gamma/beta); // (*Udot) *= a1; Udot->addVector(a1, *Utdotdot,a2); double a3 = -1.0/(beta*deltaT); double a4 = 1 - 0.5/beta; // (*Udotdot) *= a4; Udotdot->addVector(a4, *Utdot,a3); } else { // set new displacement and velocity at t + delta t double a1 = (deltaT*deltaT/2.0); U->addVector(1.0, *Utdot,deltaT); U->addVector(1.0, *Utdotdot,a1); Udot->addVector(1.0, *Utdotdot,deltaT); } // set the new trial response quantities theModel->setResponse(*U,*Udot,*Udotdot); // increment the time and apply the load double time = theModel->getCurrentDomainTime(); time +=deltaT; if (theModel->updateDomain(time, deltaT) < 0) { opserr << "Newmark::newStep() - failed to update the domain\n"; return -4; } return 0; } int Newmark::revertToLastStep() { // set response at t+delta t to be that at t .. for next newStep if (U != 0) { (*U) = *Ut; (*Udot) = *Utdot; (*Udotdot) = *Utdotdot; } return 0; } int Newmark::formEleTangent(FE_Element *theEle) { if (determiningMass == true) return 0; theEle->zeroTangent(); if (statusFlag == CURRENT_TANGENT) { theEle->addKtToTang(c1); theEle->addCtoTang(c2); theEle->addMtoTang(c3); } else if (statusFlag == INITIAL_TANGENT) { theEle->addKiToTang(c1); theEle->addCtoTang(c2); theEle->addMtoTang(c3); } return 0; } int Newmark::formNodTangent(DOF_Group *theDof) { if (determiningMass == true) return 0; theDof->zeroTangent(); theDof->addMtoTang(c3); theDof->addCtoTang(c2); return(0); } int Newmark::domainChanged() { AnalysisModel *myModel = this->getAnalysisModelPtr(); LinearSOE *theLinSOE = this->getLinearSOEPtr(); const Vector &x = theLinSOE->getX(); int size = x.Size(); // if damping factors exist set them in the ele & node of the domain if (alphaM != 0.0 || betaK != 0.0 || betaKi != 0.0 || betaKc != 0.0) myModel->setRayleighDampingFactors(alphaM, betaK, betaKi, betaKc); // create the new Vector objects if (Ut == 0 || Ut->Size() != size) { // delete the old if (Ut != 0) delete Ut; if (Utdot != 0) delete Utdot; if (Utdotdot != 0) delete Utdotdot; if (U != 0) delete U; if (Udot != 0) delete Udot; if (Udotdot != 0) delete Udotdot; // create the new Ut = new Vector(size); Utdot = new Vector(size); Utdotdot = new Vector(size); U = new Vector(size); Udot = new Vector(size); Udotdot = new Vector(size); // cheack we obtained the new if (Ut == 0 || Ut->Size() != size || Utdot == 0 || Utdot->Size() != size || Utdotdot == 0 || Utdotdot->Size() != size || U == 0 || U->Size() != size || Udot == 0 || Udot->Size() != size || Udotdot == 0 || Udotdot->Size() != size) { opserr << "Newmark::domainChanged - ran out of memory\n"; // delete the old if (Ut != 0) delete Ut; if (Utdot != 0) delete Utdot; if (Utdotdot != 0) delete Utdotdot; if (U != 0) delete U; if (Udot != 0) delete Udot; if (Udotdot != 0) delete Udotdot; Ut = 0; Utdot = 0; Utdotdot = 0; U = 0; Udot = 0; Udotdot = 0; return -1; } } // now go through and populate U, Udot and Udotdot by iterating through // the DOF_Groups and getting the last committed velocity and accel DOF_GrpIter &theDOFs = myModel->getDOFs(); DOF_Group *dofPtr; while ((dofPtr = theDOFs()) != 0) { const ID &id = dofPtr->getID(); int idSize = id.Size(); int i; const Vector &disp = dofPtr->getCommittedDisp(); for (i=0; i < idSize; i++) { int loc = id(i); if (loc >= 0) { (*U)(loc) = disp(i); } } const Vector &vel = dofPtr->getCommittedVel(); for (i=0; i < idSize; i++) { int loc = id(i); if (loc >= 0) { (*Udot)(loc) = vel(i); } } const Vector &accel = dofPtr->getCommittedAccel(); for (i=0; i < idSize; i++) { int loc = id(i); if (loc >= 0) { (*Udotdot)(loc) = accel(i); } } } return 0; } int Newmark::update(const Vector &deltaU) { AnalysisModel *theModel = this->getAnalysisModelPtr(); if (theModel == 0) { opserr << "WARNING Newmark::update() - no AnalysisModel set\n"; return -1; } // check domainChanged() has been called, i.e. Ut will not be zero if (Ut == 0) { opserr << "WARNING Newmark::update() - domainChange() failed or not called\n"; return -2; } // check deltaU is of correct size if (deltaU.Size() != U->Size()) { opserr << "WARNING Newmark::update() - Vectors of incompatable size "; opserr << " expecting " << U->Size() << " obtained " << deltaU.Size() << endln; return -3; } // determine the response at t+delta t if (displ == true) { (*U) += deltaU; Udot->addVector(1.0, deltaU,c2); Udotdot->addVector(1.0, deltaU,c3); } else { (*Udotdot) += deltaU; U->addVector(1.0, deltaU,c1); Udot->addVector(1.0, deltaU,c2); } // update the responses at the DOFs theModel->setResponse(*U,*Udot,*Udotdot); if (theModel->updateDomain() < 0) { opserr << "Newmark::update() - failed to update the domain\n"; return -4; } return 0; } int Newmark::sendSelf(int cTag, Channel &theChannel) { Vector data(8); data(0) = gamma; data(1) = beta; if (displ == true) data(2) = 1.0; else data(2) = 0.0; data(3) = 1.0; data(4) = alphaM; data(5) = betaK; data(6) = betaKi; data(7) = betaKc; if (theChannel.sendVector(this->getDbTag(), cTag, data) < 0) { opserr << "WARNING Newmark::sendSelf() - could not send data\n"; return -1; } return 0; } int Newmark::recvSelf(int cTag, Channel &theChannel, FEM_ObjectBroker &theBroker) { Vector data(8); if (theChannel.recvVector(this->getDbTag(), cTag, data) < 0) { opserr << "WARNING Newmark::recvSelf() - could not receive data\n"; gamma = 0.5; beta = 0.25; return -1; } gamma = data(0); beta = data(1); if (data(2) == 1.0) displ = true; else displ = false; alphaM = data(4); betaK = data(5); betaKi = data(6); betaKc = data(7); return 0; } void Newmark::Print(OPS_Stream &s, int flag) { AnalysisModel *theModel = this->getAnalysisModelPtr(); if (theModel != 0) { double currentTime = theModel->getCurrentDomainTime(); s << "\t Newmark - currentTime: " << currentTime; s << " gamma: " << gamma << " beta: " << beta << endln; s << " c1: " << c1 << " c2: " << c2 << " c3: " << c3 << endln; s << " Rayleigh Damping - alphaM: " << alphaM; s << " betaK: " << betaK << " betaKi: " << betaKi << endln; } else s << "\t Newmark - no associated AnalysisModel\n"; } // AddingSensitivity:BEGIN ////////////////////////////// int Newmark::revertToStart() { if (Ut != 0) Ut->Zero(); if (Utdot != 0) Utdot->Zero(); if (Utdotdot != 0) Utdotdot->Zero(); if (U != 0) U->Zero(); if (Udot != 0) Udot->Zero(); if (Udotdot != 0) Udotdot->Zero(); return 0; } // AddingSensitivity:END //////////////////////////////// Generated on Mon Oct 23 15:04:59 2006 for OpenSees by  1.5.0

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