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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 $
00022 // $Date: 2001/07/20 01:38:13 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/element/truss/CorotTruss.h,v $
00024 
00025 #ifndef CorotTruss_h
00026 #define CorotTruss_h
00027 
00028 // Written: MHS 
00029 // Created: May 2001
00030 //
00031 // Description: This file contains the class definition for CorotTruss,
00032 // a small strain, large displacement corotational space truss element,
00033 // as described by Crisfield in "Nonlinear Finite Element Analysis of
00034 // Solids and Structures", Vol. 1, 1991, J.T. Wiley.
00035 
00036 #include <Element.h>
00037 #include <Matrix.h>
00038 #include <Vector.h>
00039 
00040 #include <Node.h>
00041 #include <Channel.h>
00042 #include <UniaxialMaterial.h>
00043 
00045 class CorotTruss : public Element
00046 {
00047   public:
00049     CorotTruss(int tag, int dim,
00050    int Nd1, int Nd2, 
00051    UniaxialMaterial &theMaterial,
00052    double A, double rho=0.0);
00053     
00055     CorotTruss();    
00057     ~CorotTruss();
00058 
00060     int getNumExternalNodes(void) const;
00062     const ID &getExternalNodes(void);
00064     int getNumDOF(void); 
00066     void setDomain(Domain *theDomain);
00067 
00069     int commitState(void);
00071     int revertToLastCommit(void);        
00073     int revertToStart(void);        
00075     int update(void);
00076     
00078     const Matrix &getTangentStiff(void);
00080     const Matrix &getSecantStiff(void);    
00082     const Matrix &getDamp(void);    
00084     const Matrix &getMass(void);    
00085 
00087     void zeroLoad(void); 
00089     int addLoad(const Vector &addP);
00091     int addInertiaLoadToUnbalance(const Vector &accel);
00093     const Vector &getResistingForce(void);
00095     const Vector &getResistingForceIncInertia(void);            
00096 
00098     int sendSelf(int commitTag, Channel &theChannel);
00100     int recvSelf(int commitTag, Channel &theChannel,
00101    FEM_ObjectBroker &theBroker);
00103     int displaySelf(Renderer &theViewer, int displayMode, float fact);    
00105     void Print(ostream &s, int flag =0);    
00106 
00108     Response *setResponse(char **argv, int argc, Information &eleInfo);
00110     int getResponse(int responseID, Information &eleInformation);
00111 
00112   protected:
00113     
00114   private:
00115    
00117     UniaxialMaterial *theMaterial;  
00118     ID  connectedExternalNodes;     
00119     int numDOF;                     
00120     int numDIM;                     
00121 
00122     double Lo;     
00123     double Ln;  
00124     double d21[3]; 
00125     double A;      
00126     double M;      
00127 
00128     Node *end1Ptr;  
00129     Node *end2Ptr;  
00130 
00131  Matrix R; 
00132 
00133     Matrix *theMatrix;
00134 
00136     static Matrix M2;
00138     static Matrix M4;
00140     static Matrix M6;
00142     static Matrix M12;
00143     
00145     Vector *theVector;
00146 
00148     static Vector V2;
00150     static Vector V4;
00152     static Vector V6;
00154     static Vector V12;
00155 };
00156 
00157 #endif
00158 
00159 
00160 
00161 
00162 ÿ