Pinching.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: 1.5 $ 00022 // $Date: 2006/08/03 23:44:38 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/snap/Pinching.h,v $ 00024 // 00025 // 00026 // Pinching.h: implementation of the Pinching class from Fortran version. 00027 // Originally from SNAP PROGRAM by Prof H.K. Krawinkler 00028 // 00029 // Written: Arash Altoontash, Gregory Deierlein, 12/01 00030 // Revised: 05/03 00031 // 00032 // Purpose: This file contains the implementation for the Pinching class. 00033 // 00035 00036 // Pinching.h: interface for the Pinching class. 00037 // 00039 00040 #ifndef PINCHING_H 00041 #define PINCHING_H 00042 00043 #include <UniaxialMaterial.h> 00044 #include <Vector.h> 00045 #include <stdio.h> 00046 00047 class Pinching : public UniaxialMaterial 00048 { 00049 public: 00050 Pinching(); 00051 Pinching(int tag, Vector inputParam ); 00052 virtual ~Pinching(); 00053 00054 const char *getClassType(void) const {return "Pinching";}; 00055 int setTrialStrain(double d, double strainRate = 0.0); 00056 double getStrain(void); 00057 00058 double getStress(void); 00059 double getTangent(void); 00060 double getInitialTangent(void); 00061 int commitState(void); 00062 int revertToLastCommit(void); 00063 int revertToStart(void); 00064 00065 //virtual 00066 UniaxialMaterial *getCopy(void); 00067 00068 int sendSelf(int commitTag, Channel &theChannel); 00069 int recvSelf(int commitTag, Channel &theChannel, 00070 FEM_ObjectBroker &theBroker); 00071 00072 void Print(OPS_Stream &s, int flag =0); 00073 00074 protected: 00075 void envelPosCap(double fy, double alfaPos, double alfaCap, 00076 double cpDsp, double d, double *f, double *ek ); 00077 00078 void envelNegCap(double fy, double alfaNeg, double alfaCap, 00079 double cpDsp, double d, double *f, double *ek); 00080 00081 void recordInfo(int cond =0); 00082 00083 00084 private: 00085 00086 // Input parameters 00087 double elstk,fyieldPos,fyieldNeg,alpha,Resfac; // Properties 00088 double capSlope,capDispPos,capDispNeg; // Cap 00089 double ecaps,ecapk,ecapa,ecapd,cs,ck,ca,cd; // Degradation parameters 00090 double fpPos,fpNeg,a_pinch; // Pinching 00091 00092 // Parameters calculated from input data 00093 double dyieldPos,dyieldNeg,Enrgts,Enrgta,Enrgtk,Enrgtd; 00094 00095 double hsTrial[22], hsCommit[22], hsLastCommit[22]; 00096 00097 }; 00098 00099 #endif
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