Truss.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: 1.15 $ 00022 // $Date: 2006/09/05 21:15:19 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/element/truss/Truss.h,v $ 00024 00025 00026 #ifndef Truss_h 00027 #define Truss_h 00028 00029 // Written: fmk 00030 // Created: 07/98 00031 // Revision: A 00032 // 00033 // Description: This file contains the class definition for Truss. A Truss object 00034 // provides the abstraction of the small deformation bar element. Each truss 00035 // object is assocaited with a material object. This Truss element will work 00036 // in 1d, 2d or 3d problems. 00037 // 00038 // What: "@(#) Truss.h, revA" 00039 00040 #include <Element.h> 00041 #include <Matrix.h> 00042 00043 class Node; 00044 class Channel; 00045 class UniaxialMaterial; 00046 00047 class Truss : public Element 00048 { 00049 public: 00050 Truss(int tag, 00051 int dimension, 00052 int Nd1, int Nd2, 00053 UniaxialMaterial &theMaterial, 00054 double A, double rho=0.0); 00055 00056 Truss(); 00057 ~Truss(); 00058 00059 const char *getClassType(void) const {return "Truss";}; 00060 00061 // public methods to obtain inforrmation about dof & connectivity 00062 int getNumExternalNodes(void) const; 00063 const ID &getExternalNodes(void); 00064 Node **getNodePtrs(void); 00065 00066 int getNumDOF(void); 00067 void setDomain(Domain *theDomain); 00068 00069 // public methods to set the state of the element 00070 int commitState(void); 00071 int revertToLastCommit(void); 00072 int revertToStart(void); 00073 int update(void); 00074 00075 // public methods to obtain stiffness, mass, damping and residual information 00076 const Matrix &getKi(void); 00077 const Matrix &getTangentStiff(void); 00078 const Matrix &getInitialStiff(void); 00079 const Matrix &getDamp(void); 00080 const Matrix &getMass(void); 00081 00082 void zeroLoad(void); 00083 int addLoad(ElementalLoad *theLoad, double loadFactor); 00084 int addInertiaLoadToUnbalance(const Vector &accel); 00085 00086 const Vector &getResistingForce(void); 00087 const Vector &getResistingForceIncInertia(void); 00088 00089 // public methods for element output 00090 int sendSelf(int commitTag, Channel &theChannel); 00091 int recvSelf(int commitTag, Channel &theChannel, FEM_ObjectBroker &theBroker); 00092 int displaySelf(Renderer &theViewer, int displayMode, float fact); 00093 void Print(OPS_Stream &s, int flag =0); 00094 00095 Response *setResponse(const char **argv, int argc, Information &eleInfo, OPS_Stream &s); 00096 int getResponse(int responseID, Information &eleInformation); 00097 00098 // AddingSensitivity:BEGIN ////////////////////////////////////////// 00099 int addInertiaLoadSensitivityToUnbalance(const Vector &accel, bool tag); 00100 int setParameter(const char **argv, int argc, Parameter ¶m); 00101 int updateParameter(int parameterID, Information &info); 00102 int activateParameter(int parameterID); 00103 const Vector & getResistingForceSensitivity(int gradNumber); 00104 const Matrix & getKiSensitivity(int gradNumber); 00105 const Matrix & getMassSensitivity(int gradNumber); 00106 int commitSensitivity(int gradNumber, int numGrads); 00107 // AddingSensitivity:END /////////////////////////////////////////// 00108 00109 protected: 00110 00111 private: 00112 double computeCurrentStrain(void) const; 00113 double computeCurrentStrainRate(void) const; 00114 00115 // private attributes - a copy for each object of the class 00116 UniaxialMaterial *theMaterial; // pointer to a material 00117 ID connectedExternalNodes; // contains the tags of the end nodes 00118 int dimension; // truss in 2 or 3d domain 00119 int numDOF; // number of dof for truss 00120 00121 Vector *theLoad; // pointer to the load vector P 00122 Matrix *theMatrix; // pointer to objects matrix (a class wide Matrix) 00123 Vector *theVector; // pointer to objects vector (a clas wide Vector) 00124 00125 double L; // length of truss based on undeformed configuration 00126 double A; // area of truss 00127 double rho; // rho: mass density per unit length 00128 00129 double cosX[3]; // direction cosines 00130 00131 Node *theNodes[2]; 00132 00133 // AddingSensitivity:BEGIN ////////////////////////////////////////// 00134 int parameterID; 00135 Vector *theLoadSens; 00136 // AddingSensitivity:END /////////////////////////////////////////// 00137 00138 // static data - single copy for all objects of the class 00139 static Matrix trussM2; // class wide matrix for 2*2 00140 static Matrix trussM4; // class wide matrix for 4*4 00141 static Matrix trussM6; // class wide matrix for 6*6 00142 static Matrix trussM12; // class wide matrix for 12*12 00143 static Vector trussV2; // class wide Vector for size 2 00144 static Vector trussV4; // class wide Vector for size 44 00145 static Vector trussV6; // class wide Vector for size 6 00146 static Vector trussV12; // class wide Vector for size 12 00147 }; 00148 00149 #endif 00150 00151 00152 00153
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