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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: 1.1.1.1 $
00022 // $Date: 2000/09/15 08:23:16 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/analysis/fe_ele/lagrange/LagrangeSP_FE.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef LagrangeSP_FE_h
00027 #define LagrangeSP_FE_h
00028 
00029 // File: ~/analysis/fe_ele/lagrange/LagrangeSP_FE.h
00030 // 
00031 // Written: fmk 
00032 // Created: 02/99
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for LagrangeSP_FE.
00036 // LagrangeSP_FE is a subclass of FE_Element which handles SP_Constraints
00037 // using the Lagrange method.
00038 //
00039 // What: "@(#) LagrangeSP_FE.h, revA"
00040 
00041 #include <FE_Element.h>
00042 #include <ID.h>
00043 #include <Matrix.h>
00044 #include <Vector.h>
00045 
00046 #include <Element.h>
00047 #include <Integrator.h>
00048 #include <AnalysisModel.h>
00049 #include <Domain.h>
00050 #include <SP_Constraint.h>
00051 #include <Node.h>
00052 #include <DOF_Group.h>
00053 
00072 class LagrangeSP_FE: public FE_Element
00073 {
00074   public:
00076     LagrangeSP_FE(Domain &theDomain, SP_Constraint &theSP, 
00077 
00078     DOF_Group &theDofGrp, double alpha = 1.0);
00080     virtual ~LagrangeSP_FE();    
00081 
00083     virtual int  setID(void);
00085     virtual const Matrix &getTangent(Integrator *theIntegrator);    
00087     virtual const Vector &getResidual(Integrator *theIntegrator);    
00089     virtual const Vector &getTangForce(const Vector &x, double fact = 1.0);
00090     
00091   protected:
00092     
00093   private:
00095     double alpha;
00097     Matrix *tang;
00099     Vector *resid;
00100     
00102     SP_Constraint *theSP;
00104     Node *theNode;    
00105 
00107     DOF_Group *theDofGroup;
00108 };
00109 
00110 #endif
00111 
00112