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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: 1.3 $
00022 // $Date: 2001/03/29 03:51:07 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/element/truss/TrussSection.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef TrussSection_h
00027 #define TrussSection_h
00028 
00029 // File: ~/element/truss/TrussSection.h
00030 // 
00031 // Written: fmk 
00032 // Created: 07/98
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for Truss. A Truss 
00036 // object provides the abstraction of the small deformation bar element. 
00037 // Each truss object is assocaited with a section object. This Truss element 
00038 // will work in 1d, 2d or 3d problems.
00039 //
00040 // What: "@(#) Truss.h, revA"
00041 
00042 #include <Element.h>
00043 #include <Matrix.h>
00044 
00045 #include <Node.h>
00046 #include <Channel.h>
00047 #include <SectionForceDeformation.h>
00048 
00050 class TrussSection : public Element
00051 {
00052   public:
00054     TrussSection(int tag, 
00055    int dimension,
00056    int Nd1, int Nd2, 
00057    SectionForceDeformation &theSection,
00058    double rho=0.0);     
00059     
00061     TrussSection();    
00063     ~TrussSection();
00064 
00066     int getNumExternalNodes(void) const;
00068     const ID &getExternalNodes(void);
00070     int getNumDOF(void); 
00072     void setDomain(Domain *theDomain);
00073 
00075     int commitState(void);
00077     int revertToLastCommit(void);        
00079     int revertToStart(void);        
00081     int update(void);
00082 
00084     const Matrix &getTangentStiff(void);
00086     const Matrix &getSecantStiff(void);    
00088     const Matrix &getDamp(void);    
00090     const Matrix &getMass(void);    
00091 
00093     void zeroLoad(void); 
00095     int addLoad(const Vector &addP);
00097     int addInertiaLoadToUnbalance(const Vector &accel);
00099     const Vector &getResistingForce(void);
00101     const Vector &getResistingForceIncInertia(void);            
00102 
00104     int sendSelf(int commitTag, Channel &theChannel);
00106     int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker);
00108     int displaySelf(Renderer &theViewer, int displayMode, float fact);    
00110     void Print(ostream &s, int flag =0);    
00111     
00113  Response *setResponse(char **argv, int argc, Information &eleInformation);
00115     int getResponse(int responseID, Information &eleInformation);
00116     
00118     int setParameter (char **argv, int argc, Information &info);
00120     int updateParameter (int parameterID, Information &info);
00121 
00122   protected:
00123     
00124   private:
00126     double computeCurrentStrain(void) const;
00127     
00129     ID  connectedExternalNodes;          
00130     int dimension;                       
00131     int numDOF;                          
00132 
00133     Vector *theLoad;          
00134     Matrix *theMatrix;  
00135     Vector *theVector;      
00136 
00137     Matrix *t;        
00138 
00139     double L;  
00140     double M;   
00141 
00142     Node *end1Ptr;      
00143     Node *end2Ptr;      
00144 
00145     SectionForceDeformation  *theSection;
00146     
00148     static Matrix trussM2;   
00149     static Matrix trussM3;   
00150     static Matrix trussM4;   
00151     static Matrix trussM6;   
00152     static Matrix trussM12;  
00153     static Vector trussV2;   
00154     static Vector trussV3;   
00155     static Vector trussV4;   
00156     static Vector trussV6;   
00157     static Vector trussV12;  // class wide Vector for size 12
00158 };
00159 
00160 #endif
00161 
00162 
00163 
00164 
00165 ÿ