My title

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: 1.1.1.1 $
00022 // $Date: 2000/09/15 08:23:16 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/fe_ele/lagrange/LagrangeMP_FE.h,v $
00024                                                                         
00025                                                                         
00026 // File: ~/analysis/fe_ele/lagrange/LagrangeMP_FE.h
00027 // 
00028 // Written: fmk 
00029 // Created: 02/99
00030 // Revision: A
00031 //
00032 // Description: This file contains the class definition for LagrangeMP_FE.
00033 // LagrangeMP_FE is a subclass of FE_Element which handles MP_Constraints
00034 // using the Lagrange method.
00035 //
00036 // What: "@(#) LagrangeMP_FE.h, revA"
00037 
00038 
00039 #ifndef LagrangeMP_FE_h
00040 #define LagrangeMP_FE_h
00041 
00042 #include <FE_Element.h>
00043 #include <ID.h>
00044 #include <Matrix.h>
00045 #include <Vector.h>
00046 
00047 #include <Element.h>
00048 #include <Integrator.h>
00049 #include <AnalysisModel.h>
00050 #include <Domain.h>
00051 #include <MP_Constraint.h>
00052 #include <Node.h>
00053 #include <DOF_Group.h>
00054 
00078 class LagrangeMP_FE: public FE_Element
00079 {
00080   public:
00082     LagrangeMP_FE(Domain &theDomain, MP_Constraint &theMP, 
00083 
00084     DOF_Group &theDofGrp, double alpha = 1.0);
00086     virtual ~LagrangeMP_FE();    
00087 
00089     virtual int  setID(void);
00091     virtual const Matrix &getTangent(Integrator *theIntegrator);    
00093     virtual const Vector &getResidual(Integrator *theIntegrator);    
00095     virtual const Vector &getTangForce(const Vector &x, double fact = 1.0);
00096     
00097   protected:
00098     
00099   private:
00101     double alpha;
00103     void determineTangent(void);
00104     
00106     MP_Constraint *theMP;
00108     Node *theConstrainedNode;
00110     Node *theRetainedNode;    
00111 
00113     DOF_Group *theDofGroup;
00115     Matrix *tang;
00117     Vector *resid;
00118 };
00119 
00120 #endif
00121 
00122