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StaticIntegrator.cpp

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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: 1.4 $
00022 // $Date: 2003/02/14 23:00:49 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/integrator/StaticIntegrator.cpp,v $
00024                                                                         
00025                                                                         
00026 // File: ~/analysis/integrator/StaticIntegrator.C
00027 // 
00028 // Written: fmk 
00029 // Created: 11/96
00030 // Revision: A
00031 //
00032 // Description: This file contains the class definition for StaticIntegrator.
00033 // StaticIntegrator is an algorithmic class for setting up the finite element
00034 // equations for a static analysis and for Incrementing the nodal displacements
00035 // with the values in the soln vector to the LinearSOE object. 
00036 //
00037 // What: "@(#) StaticIntegrator.C, revA"
00038 
00039 #include <StaticIntegrator.h>
00040 #include <FE_Element.h>
00041 #include <LinearSOE.h>
00042 #include <AnalysisModel.h>
00043 #include <Vector.h>
00044 #include <DOF_Group.h>
00045 #include <Channel.h>
00046 #include <FEM_ObjectBroker.h>
00047 
00048 StaticIntegrator::StaticIntegrator(int clasTag)
00049 :IncrementalIntegrator(clasTag)
00050 {
00051     // for subclasses
00052 }
00053 
00054 StaticIntegrator::~StaticIntegrator()
00055 {
00056 }
00057 
00058 int
00059 StaticIntegrator::formEleTangent(FE_Element *theEle)
00060 {
00061     // only elements stiffness matrix needed
00062 
00063   if (statusFlag == CURRENT_TANGENT) {
00064     theEle->zeroTangent();
00065     theEle->addKtToTang();
00066   } else if (statusFlag == INITIAL_TANGENT) {
00067     theEle->zeroTangent();
00068     theEle->addKiToTang();
00069   } 
00070 
00071     return 0;
00072 }    
00073 
00074 int
00075 StaticIntegrator::formEleResidual(FE_Element *theEle)
00076 {
00077     // only elements residual needed
00078     theEle->zeroResidual();
00079     theEle->addRtoResidual();
00080     return 0;
00081 }    
00082 
00083 int
00084 StaticIntegrator::formNodTangent(DOF_Group *theDof)
00085 {
00086     // should never be called
00087     opserr << "StaticIntegrator::formNodTangent() -";
00088     opserr << " this method should never have been called!\n";
00089     return -1;
00090 }    
00091 
00092 int
00093 StaticIntegrator::formNodUnbalance(DOF_Group *theDof)
00094 {
00095     // only nodes unbalance need be added
00096     theDof->zeroUnbalance();
00097     theDof->addPtoUnbalance();
00098     return 0;
00099 }    
00100

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