Subversion Repositories OpenSees

/* ****************************************************************** **

**    OpenSees - Open System for Earthquake Engineering Simulation    **

**          Pacific Earthquake Engineering Research Center            **

**                                                                    **

**                                                                    **

** (C) Copyright 1999, The Regents of the University of California    **

** All Rights Reserved.                                               **

**                                                                    **

** Commercial use of this program without express permission of the   **

** University of California, Berkeley, is strictly prohibited.  See   **

** file 'COPYRIGHT'  in main directory for information on usage and   **

** redistribution,  and for a DISCLAIMER OF ALL WARRANTIES.           **

**                                                                    **

** Developed by:                                                      **

**   Frank McKenna (fmckenna@ce.berkeley.edu)                         **

**   Gregory L. Fenves (fenves@ce.berkeley.edu)                       **

**   Filip C. Filippou (filippou@ce.berkeley.edu)                     **

**                                                                    **

** ****************************************************************** */

// $Revision: 1.6 $

// $Date: 2003-02-25 23:32:46 $

// $Source: /usr/local/cvs/OpenSees/SRC/element/beam3d/beam3d02.h,v $

// Written: fmk 11/95

// Revised:

//

// Purpose: This file contains the class definition for beam3d02.

// beam3d02 is a plane frame member.

#ifndef beam3d02_h

#define beam3d02_h

#include <Element.h>

#include <Node.h>

#include <Matrix.h>

#include <Vector.h>

class Channel;

class beam3d02 : public Element

{

  public:

    beam3d02();        

    beam3d02(int tag, double A, double E, double G,

              double Jx, double Iy, double Iz, int Nd1, int Nd2, double theta);

    ~beam3d02();

    int getNumExternalNodes(void) const;

    const ID &getExternalNodes(void);

    Node **getNodePtrs(void);

    int getNumDOF(void);

    void setDomain(Domain *theDomain);

    int revertToLastCommit(void);        

    const Matrix &getTangentStiff(void);

    const Matrix &getInitialStiff(void);

    void zeroLoad(void);       

    int addLoad(ElementalLoad *theLoad, double loadFactor);

    int addInertiaLoadToUnbalance(const Vector &accel);

    const Vector &getResistingForce(void);

    const Vector &getResistingForceIncInertia(void);            

    int sendSelf(int commitTag, Channel &theChannel);

    int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker);

    void Print(OPS_Stream &s, int flag =0);    

  private:

    const Matrix &getStiff(void);    

    void formVar(void);

    double A,E,G,Jx,Iy,Iz,theta;

    double L;

    double dx,dy,dz,EA,twoE,fourE,twelveE,sixE;

    static Matrix k; // the stiffness matrix

    static Matrix m; // the mass matrix 

    static Matrix d; // the damping matrix

    Vector rForce;

    Vector load;

    ID  connectedExternalNodes;    

    int isStiffFormed;

    Node *theNodes[2];

};

#endif