CableMaterial.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: 1.6 $ 00022 // $Date: 2006/08/03 23:42:19 $: 2001/07/16 08:23:22 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/CableMaterial.h,v $ 00024 00025 00026 #ifndef CableMaterial_h 00027 #define CableMaterial_h 00028 00029 // Written: Charles Chadwell 00030 // Created: 07/01 00031 // 00032 // Description: This file contains the class definition for 00033 // CableMaterial. CableMaterial provides the abstraction 00034 // of an elastic uniaxial material, 00035 // 00036 // The input parameters are the Prestress, E, Effective Self Weight (gravity component of 00037 // Weight per volume transverse to the cable), and Length of the cable. 00038 // 00039 // The cable Force Displacement is converted to Stress Strain material for use 00040 // with the truss element. The stress strain ranges from slack (large strain at zero 00041 // stress) to taught (linear with modulus E). The material has no history and is not 00042 // path dependent. 00043 // 00044 // 00045 // What: "@(#) CableMaterial.h, revA" 00046 00047 00048 #include <UniaxialMaterial.h> 00049 00050 class CableMaterial : public UniaxialMaterial 00051 { 00052 public: 00053 CableMaterial(int tag, double Prestress, double E, double unitWeightEff, double L_Element); 00054 CableMaterial(); 00055 ~CableMaterial(); 00056 00057 const char *getClassType(void) const {return "CableMaterial";}; 00058 00059 int setTrialStrain(double strain, double strainRate = 0.0); 00060 int setTrial (double strain, double &stress, double &tangent, double strainRate = 0.0); 00061 double getStrain(void) {return trialStrain;}; 00062 double getStress(void); 00063 double getTangent(void); 00064 double getInitialTangent(void) {return 1.0e-8;}; 00065 00066 int commitState(void); 00067 int revertToLastCommit(void); 00068 int revertToStart(void); 00069 00070 UniaxialMaterial *getCopy(void); 00071 00072 int sendSelf(int commitTag, Channel &theChannel); 00073 int recvSelf(int commitTag, Channel &theChannel, 00074 FEM_ObjectBroker &theBroker); 00075 00076 void Print(OPS_Stream &s, int flag =0); 00077 00078 //int setParameter(const char **argv, int argc, Information &info); 00079 //int updateParameter(int parameterID, Information &info); 00080 00081 protected: 00082 00083 private: 00084 00085 double Ps; 00086 double E; 00087 double Mue; 00088 double L; 00089 double trialStrain; 00090 00091 double evalStress(double stress); 00092 double abs(double value); 00093 00094 double trialStress; // current trial stress 00095 double trialTangent; // current trial tangent 00096 }; 00097 00098 00099 #endif 00100
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