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: 1.2 $
00022 // $Date: 2000/12/18 10:40:50 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/element/zeroLength/ZeroLengthSection.h,v $
00024                                                                         
00025 // Written: MHS
00026 // Created: Sept 2000
00027 //
00028 // Description: This file contains the class definition for ZeroLengthSection.
00029 // A ZeroLengthSection element is defined by two nodes with the same coordinate.
00030 // A SectionForceDeformation object is associated with the nodes to
00031 // provide the basic force-deformation relationship for the element.
00032 
00033 #ifndef ZeroLengthSection_h
00034 #define ZeroLengthSection_h
00035 
00036 #include <Element.h>
00037 #include <Matrix.h>
00038 
00039 // Tolerance for zero length of element
00040 #define LENTOL 1.0e-6
00041 
00042 #include <Node.h>
00043 #include <Channel.h>
00044 #include <SectionForceDeformation.h>
00045 #include <Response.h>
00046 
00065 class ZeroLengthSection : public Element
00066 {
00067   public:
00068     
00078     ZeroLengthSection(int tag,          
00079 
00080         int dimension,
00081         int Nd1, int Nd2, 
00082         const Vector& x,
00083         const Vector& yprime,
00084      SectionForceDeformation& theSection);
00085 
00093     ZeroLengthSection();    
00094 
00099     ~ZeroLengthSection();
00100 
00101 
00103     int getNumExternalNodes(void) const;
00108     const ID &getExternalNodes(void);
00109 
00115     int getNumDOF(void); 
00116 
00123     void setDomain(Domain *theDomain);
00124 
00125 
00127     int commitState(void);
00133     int revertToLastCommit(void);        
00134 
00140     int revertToStart(void);        
00141 
00142 
00144     const Matrix &getTangentStiff(void);
00150     const Matrix &getSecantStiff(void);    
00151 
00156     const Matrix &getDamp(void);    
00157 
00162     const Matrix &getMass(void);    
00163 
00164 
00169     void zeroLoad(void); 
00170 
00175     int addLoad(const Vector &addP);
00176 
00181     int addInertiaLoadToUnbalance(const Vector &accel);    
00182 
00189     const Vector &getResistingForce(void);
00190 
00195     const Vector &getResistingForceIncInertia(void);            
00196 
00197 
00199     int sendSelf(int commitTag, Channel &theChannel);
00204     int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker);
00205 
00210     int displaySelf(Renderer &theViewer, int displayMode, float fact);    
00211 
00216     void Print(ostream &s, int flag =0);    
00217 
00218 
00220     Response *setResponse(char **argv, int argc, Information &eleInformation);
00221 
00223     int getResponse(int responseID, Information &eleInformation);
00224     
00225   protected:
00226     
00227   private:
00229     void setUp (int Nd1, int Nd2, const Vector& x, const Vector& y);
00231     void setTransformation(void);
00233  void computeSectionDefs(void);
00234 
00236     ID  connectedExternalNodes;         
00237     int dimension;                      
00238     int numDOF;                         
00239     Matrix transformation;  
00240  
00241  Matrix *A; 
00242  Vector *v; 
00243 
00244  Matrix *K; 
00245  Vector *P; 
00246 
00247     Node *end1Ptr;        
00248     Node *end2Ptr;        
00249 
00250  SectionForceDeformation *theSection; 
00251  int order;  // Order of the section model
00252 
00254  static Matrix K6;
00256  static Matrix K12;
00257 
00259  static Vector P6;
00261  static Vector P12;
00262 };
00263 
00264 #endif
00265 
00266 
00267 
00268