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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 03:41:36 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/element/Element.h,v $
00024                                                                         
00025                                                                         
00026 // File: ~/element/Element.h
00027 //
00028 // Written: fmk 
00029 // Created: 11/96
00030 // Revision: A
00031 //
00032 // Description: This file contains the class definition for Element.
00033 // Element is an abstract base class and thus no objects of it's type
00034 // can be instantiated. It has pure virtual functions which must be
00035 // implemented in it's derived classes. 
00036 //
00037 // What: "@(#) Element.h, revA"
00038 
00039 #ifndef Element_h
00040 #define Element_h
00041 
00042 #ifndef _bool_h
00043 #include "bool.h"
00044 #endif
00045 
00046 #include <ID.h>
00047 
00048 #include <DomainComponent.h>
00049 
00050 #include <Matrix.h>
00051 #include <Vector.h>
00052 #include <Renderer.h>
00053 #include <Info.h>
00054 #include <Information.h>
00055 #include <Response.h>
00056 
00066 class Element : public DomainComponent
00067 {
00068   public:
00075     Element(int tag, int classTag);    
00076 
00081     virtual ~Element();
00082 
00083 
00085     virtual int getNumExternalNodes(void) const =0;
00089     virtual const ID &getExternalNodes(void)  =0; 
00090 
00097     virtual int getNumDOF(void) =0;
00098 
00099 
00101     virtual int commitState(void) = 0;    
00106     virtual int revertToLastCommit(void) = 0;        
00107 
00113     virtual int revertToStart(void);                
00114 
00122     virtual int update(void);
00123 
00129     virtual bool isSubdomain(void);
00130 
00131     
00132     // methods to return the current linearized stiffness,
00134     virtual const Matrix &getTangentStiff(void)=0;
00141     virtual const Matrix &getSecantStiff(void)=0;    
00142 
00148     virtual const Matrix &getDamp(void)=0;    
00149 
00155     virtual const Matrix &getMass(void)=0;    
00156 
00157 
00159     virtual int   setKi(void);
00161     virtual const Matrix &getKi(void);
00162 
00163 
00165     virtual void zeroLoad(void) =0; 
00167     virtual int addLoad(const Vector &addP) =0;
00169     virtual int addInertiaLoadToUnbalance(const Vector &accel); 
00171     virtual const Vector &getResistingForce(void) =0;
00173     virtual const Vector &getResistingForceIncInertia(void) =0;        
00174 
00176     virtual Response *setResponse(char **argv, int argc, Information &eleInformation);
00178     virtual int getResponse(int responseID, Information &eleInformation);
00179  
00180   protected:
00182     Matrix *Ki;
00183     
00184   private:
00185 };
00186 
00187 
00188 #endif
00189