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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: 2000/12/18 10:40:43 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/element/fourNodeQuad/FourNodeQuad.h,v $
00024                                                                         
00025 // Written: MHS
00026 // Created: Feb 2000
00027 // Revised: Dec 2000 for efficiency
00028 //
00029 // Description: This file contains the class definition for FourNodeQuad.
00030 
00031 #ifndef FourNodeQuad_h
00032 #define FourNodeQuad_h
00033 
00034 #ifndef _bool_h
00035 #include "bool.h"
00036 #endif
00037 
00038 #include <Element.h>
00039 #include <Matrix.h>
00040 #include <Vector.h>
00041 #include <ID.h>
00042 
00043 #include <Node.h>
00044 #include <NDMaterial.h>
00045 #include <Response.h>
00046 
00048 class FourNodeQuad : public Element
00049 {
00050   public:
00052     FourNodeQuad(int tag, int nd1, int nd2, int nd3, int nd4,
00053     NDMaterial &m, const char *type,
00054     double t, double pressure = 0.0, double rho = 0.0,
00055     double b1 = 0.0, double b2 = 0.0);
00057     FourNodeQuad();
00059     virtual ~FourNodeQuad();
00060 
00062     int getNumExternalNodes(void) const;
00064     const ID &getExternalNodes(void);
00066     int getNumDOF(void);
00068     void setDomain(Domain *theDomain);
00069 
00071     int commitState(void);
00073     int revertToLastCommit(void);
00075     int revertToStart(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();
00089     int addLoad(const Vector &addLoad);
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, FEM_ObjectBroker 
00101     &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 &eleInformation);
00110     int getResponse(int responseID, Information &eleInformation);
00111 
00113     int setParameter(char **argv, int argc, Information &info);
00115     int updateParameter(int parameterID, Information &info);
00116 
00117   protected:
00118     
00119   private:
00121 
00122     NDMaterial **theMaterial; 
00123     
00124     ID connectedExternalNodes; 
00125 
00126     Node *nd1Ptr;  
00127     Node *nd2Ptr;
00129     Node *nd3Ptr;
00131     Node *nd4Ptr;
00132 
00134     static Matrix K;  
00135     static Vector P;  
00136  Vector Q;  
00137  double b[2];  
00138  Vector pressureLoad; 
00139 
00140     double thickness; 
00141     double rho;   
00142  double pressure; // Normal surface traction (pressure) over entire element
00144 
00145  static double shp[3][4]; 
00146  static double pts[4][2]; 
00147  static double wts[4];  // Stores quadrature weights
00148 
00150     double shapeFunction(double xi, double eta);
00152  void setPressureLoadAtNodes(void);
00153 };
00154 
00155 #endif
00156 
00157 ÿ