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NewmarkExplicit.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: 1.2 $ // $Date: 2005/12/21 00:32:57 $ // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/NewmarkExplicit.cpp,v $ // File: ~/analysis/integrator/NewmarkExplicit.cpp // // Written: Andreas Schellenberg (andreas.schellenberg@gmx.net) // Created: 02/05 // Revision: A // // Description: This file contains the implementation of the NewmarkExplicit class. // // What: "@(#) NewmarkExplicit.cpp, revA" #include <NewmarkExplicit.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> NewmarkExplicit::NewmarkExplicit() : TransientIntegrator(INTEGRATOR_TAGS_NewmarkExplicit), gamma(0), alphaM(0.0), betaK(0.0), betaKi(0.0), betaKc(0.0), c2(0.0), c3(0.0), Ut(0), Utdot(0), Utdotdot(0), U(0), Udot(0), Udotdot(0) { } NewmarkExplicit::NewmarkExplicit(double _gamma) : TransientIntegrator(INTEGRATOR_TAGS_NewmarkExplicit), gamma(_gamma), alphaM(0.0), betaK(0.0), betaKi(0.0), betaKc(0.0), c2(0.0), c3(0.0), Ut(0), Utdot(0), Utdotdot(0), U(0), Udot(0), Udotdot(0) { } NewmarkExplicit::NewmarkExplicit(double _gamma, double _alphaM, double _betaK, double _betaKi , double _betaKc) : TransientIntegrator(INTEGRATOR_TAGS_NewmarkExplicit), gamma(_gamma), alphaM(_alphaM), betaK(_betaK), betaKi(_betaKi), betaKc(_betaKc), c2(0.0), c3(0.0), Ut(0), Utdot(0), Utdotdot(0), U(0), Udot(0), Udotdot(0) { } NewmarkExplicit::~NewmarkExplicit() { // 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 NewmarkExplicit::newStep(double deltaT) { updateCount = 0; if (gamma == 0) { opserr << "NewmarkExplicit::newStep() - error in variable\n"; opserr << "gamma = " << gamma << endln; return -1; } if (deltaT <= 0.0) { opserr << "NewmarkExplicit::newStep() - error in variable\n"; opserr << "dT = " << deltaT << endln; return -2; } // get a pointer to the AnalysisModel AnalysisModel *theModel = this->getAnalysisModelPtr(); // set the constants c2 = gamma*deltaT; c3 = 1.0; if (U == 0) { opserr << "NewmarkExplicit::newStep() - domainChange() failed or hasn't been called\n"; return -3; } // set response at t to be that at t+deltaT of previous step (*Ut) = *U; (*Utdot) = *Udot; (*Utdotdot) = *Udotdot; // determine new displacements and velocities at time t+deltaT U->addVector(1.0, *Utdot, deltaT); double a1 = 0.5*deltaT*deltaT; U->addVector(1.0, *Utdotdot, a1); double a2 = deltaT*(1.0 - gamma); Udot->addVector(1.0, *Utdotdot, a2); // set the trial response quantities for the elements theModel->setDisp(*U); theModel->setVel(*Udot); // increment the time and apply the load double time = theModel->getCurrentDomainTime(); time += deltaT; if (theModel->updateDomain(time, deltaT) < 0) { opserr << "NewmarkExplicit::newStep() - failed to update the domain\n"; return -4; } // determine the accelerations at t+deltaT Udotdot->Zero(); // set the trial response quantities for the nodes theModel->setAccel(*Udotdot); return 0; } int NewmarkExplicit::revertToLastStep() { // set response at t+deltaT to be that at t .. for next step if (U != 0) { (*U) = *Ut; (*Udot) = *Utdot; (*Udotdot) = *Utdotdot; } return 0; } int NewmarkExplicit::formEleTangent(FE_Element *theEle) { theEle->zeroTangent(); theEle->addCtoTang(c2); theEle->addMtoTang(c3); return 0; } int NewmarkExplicit::formNodTangent(DOF_Group *theDof) { theDof->zeroTangent(); theDof->addCtoTang(c2); theDof->addMtoTang(c3); return 0; } int NewmarkExplicit::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 element & 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 (U == 0 || U->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); // check 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 << "NewmarkExplicit::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 acceleration 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 NewmarkExplicit::update(const Vector &aiPlusOne) { updateCount++; if (updateCount > 1) { opserr << "WARNING NewmarkExplicit::update() - called more than once -"; opserr << " NewmarkExplicit integration scheme requires a LINEAR solution algorithm\n"; return -1; } AnalysisModel *theModel = this->getAnalysisModelPtr(); if (theModel == 0) { opserr << "WARNING NewmarkExplicit::update() - no AnalysisModel set\n"; return -1; } // check domainChanged() has been called, i.e. Ut will not be zero if (Ut == 0) { opserr << "WARNING NewmarkExplicit::update() - domainChange() failed or not called\n"; return -2; } // check aiPlusOne is of correct size if (aiPlusOne.Size() != U->Size()) { opserr << "WARNING NewmarkExplicit::update() - Vectors of incompatible size "; opserr << " expecting " << U->Size() << " obtained " << aiPlusOne.Size() << endln; return -3; } // determine the response at t+deltaT Udot->addVector(1.0, aiPlusOne, c2); (*Udotdot) = aiPlusOne; // update the response at the DOFs theModel->setVel(*Udot); theModel->setAccel(*Udotdot); return 0; } int NewmarkExplicit::sendSelf(int cTag, Channel &theChannel) { Vector data(5); data(0) = gamma; data(1) = alphaM; data(2) = betaK; data(3) = betaKi; data(4) = betaKc; if (theChannel.sendVector(this->getDbTag(), cTag, data) < 0) { opserr << "WARNING NewmarkExplicit::sendSelf() - could not send data\n"; return -1; } return 0; } int NewmarkExplicit::recvSelf(int cTag, Channel &theChannel, FEM_ObjectBroker &theBroker) { Vector data(5); if (theChannel.recvVector(this->getDbTag(), cTag, data) < 0) { opserr << "WARNING NewmarkExplicit::recvSelf() - could not receive data\n"; gamma = 0.5; return -1; } gamma = data(0); alphaM = data(1); betaK = data(2); betaKi = data(3); betaKc = data(4); return 0; } void NewmarkExplicit::Print(OPS_Stream &s, int flag) { AnalysisModel *theModel = this->getAnalysisModelPtr(); if (theModel != 0) { double currentTime = theModel->getCurrentDomainTime(); s << "\t NewmarkExplicit - currentTime: " << currentTime << endln; s << " gamma: " << gamma << endln; s << " c2: " << c2 << " c3: " << c3 << endln; s << " Rayleigh Damping - alphaM: " << alphaM; s << " betaK: " << betaK << " betaKi: " << betaKi << endln; } else s << "\t NewmarkExplicit - no associated AnalysisModel\n"; } Generated on Mon Oct 23 15:04:59 2006 for OpenSees by  1.5.0

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