FourNodeQuad.hGo to the documentation of this file.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: 1.12 $ 00022 // $Date: 2006/09/05 21:11:21 $ 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 class Node; 00044 class NDMaterial; 00045 class Response; 00046 00047 class FourNodeQuad : public Element 00048 { 00049 public: 00050 FourNodeQuad(int tag, int nd1, int nd2, int nd3, int nd4, 00051 NDMaterial &m, const char *type, 00052 double t, double pressure = 0.0, double rho = 0.0, 00053 double b1 = 0.0, double b2 = 0.0); 00054 FourNodeQuad(); 00055 ~FourNodeQuad(); 00056 00057 const char *getClassType(void) const {return "FourNodeQuad";}; 00058 00059 int getNumExternalNodes(void) const; 00060 const ID &getExternalNodes(void); 00061 Node **getNodePtrs(void); 00062 00063 int getNumDOF(void); 00064 void setDomain(Domain *theDomain); 00065 00066 // public methods to set the state of the element 00067 int commitState(void); 00068 int revertToLastCommit(void); 00069 int revertToStart(void); 00070 int update(void); 00071 00072 // public methods to obtain stiffness, mass, damping and residual information 00073 const Matrix &getTangentStiff(void); 00074 const Matrix &getInitialStiff(void); 00075 const Matrix &getMass(void); 00076 00077 void zeroLoad(); 00078 int addLoad(ElementalLoad *theLoad, double loadFactor); 00079 int addInertiaLoadToUnbalance(const Vector &accel); 00080 00081 const Vector &getResistingForce(void); 00082 const Vector &getResistingForceIncInertia(void); 00083 00084 // public methods for element output 00085 int sendSelf(int commitTag, Channel &theChannel); 00086 int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker 00087 &theBroker); 00088 int displaySelf(Renderer &theViewer, int displayMode, float fact); 00089 void Print(OPS_Stream &s, int flag =0); 00090 00091 Response *setResponse(const char **argv, int argc, 00092 Information &eleInformation, OPS_Stream &s); 00093 00094 int getResponse(int responseID, Information &eleInformation); 00095 00096 int setParameter(const char **argv, int argc, Parameter ¶m); 00097 int updateParameter(int parameterID, Information &info); 00098 00099 // RWB; PyLiq1 & TzLiq1 need to see the excess pore pressure and initial stresses. 00100 friend class PyLiq1; 00101 friend class TzLiq1; 00102 00103 protected: 00104 00105 private: 00106 // private attributes - a copy for each object of the class 00107 00108 NDMaterial **theMaterial; // pointer to the ND material objects 00109 00110 ID connectedExternalNodes; // Tags of quad nodes 00111 00112 Node *theNodes[4]; 00113 00114 static double matrixData[64]; // array data for matrix 00115 static Matrix K; // Element stiffness, damping, and mass Matrix 00116 static Vector P; // Element resisting force vector 00117 Vector Q; // Applied nodal loads 00118 double b[2]; // Body forces 00119 Vector pressureLoad; // Pressure load at nodes 00120 00121 double thickness; // Element thickness 00122 double rho; // Mass per unit volume 00123 double pressure; // Normal surface traction (pressure) over entire element 00124 // Note: positive for outward normal 00125 static double shp[3][4]; // Stores shape functions and derivatives (overwritten) 00126 static double pts[4][2]; // Stores quadrature points 00127 static double wts[4]; // Stores quadrature weights 00128 00129 // private member functions - only objects of this class can call these 00130 double shapeFunction(double xi, double eta); 00131 void setPressureLoadAtNodes(void); 00132 00133 Matrix *Ki; 00134 }; 00135 00136 #endif 00137
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