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Clough.h

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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: 1.2 $
00022 // $Date: 2006/08/03 23:44:38 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/snap/Clough.h,v $
00024 //
00025 //
00026 // Clough.h: implementation of the Clough 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: 03/02
00031 //
00032 // Purpose: This file contains the implementation for the Clough class.
00033 //
00035 
00036 // Clough.h: interface for the Clough class.
00037 //
00039 
00040 #ifndef Clough_H
00041 #define Clough_H
00042 
00043 #include <UniaxialMaterial.h>
00044 #include <Vector.h>
00045 #include <stdio.h>
00046 
00047 class Clough : public UniaxialMaterial
00048 {
00049  public:
00050   Clough();
00051   Clough(int tag, Vector inputParam );
00052   virtual ~Clough();
00053   const char *getClassType(void) const {return "Clough";};      
00054   int setTrialStrain(double d, double strainRate = 0.0);
00055   double getStrain(void);
00056   
00057   double getStress(void);
00058   double getTangent(void);
00059   double getInitialTangent(void);
00060   int commitState(void);
00061   int revertToLastCommit(void);    
00062   int revertToStart(void);  
00063         
00064   //virtual
00065   UniaxialMaterial *getCopy(void);
00066   
00067   int sendSelf(int commitTag, Channel &theChannel);  
00068   int recvSelf(int commitTag, Channel &theChannel,FEM_ObjectBroker &theBroker);
00069   
00070   void Print(OPS_Stream &s, int flag =0);
00071   
00072  protected:
00073   void envelPosCap(double fy, double alphaPos, double alphaCap,
00074                    double cpDsp, double d, double *f, double *ek );
00075   
00076   void envelNegCap(double fy, double alphaNeg, double alphaCap,
00077                    double cpDsp, double d, double *f, double *ek);
00078   
00079   void recordInfo(int cond =0);
00080   
00081   
00082  private:
00083   // Input parameters
00084   double elstk,fyieldPos,fyieldNeg,alpha,Resfac;                //      Properties
00085   double capSlope,capDispPos,capDispNeg;         // Cap
00086   double ecaps,ecapk,ecapa,ecapd,cs,ck,ca,cd;    // Degradation parameters
00087   
00088   // Parameters calculated from input data
00089   double dyieldPos,dyieldNeg;
00090   double Enrgts,Enrgtk,Enrgta,Enrgtd;
00091   
00092   double hsTrial[24], hsCommit[24], hsLastCommit[24];
00093   
00094 };
00095 
00096 #endif

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