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PinchingDamage.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/PinchingDamage.h,v $
00024 //
00025 //
00026 // PinchingDamage.h: implementation of the PinchingDamage class from Fortran version.
00027 // Originally from SNAP PROGRAM by Prof H.K. Krawinkler
00028 //
00029 // Written: A. Altoontash & Prof. G. Deierlein 12/01
00030 // Revised: 05/03
00031 //
00032 // Purpose: This file contains the implementation for the PinchingDamage class.
00033 //
00035 
00036 // PinchingDamage.h: interface for the PinchingDamage class.
00037 //
00039 
00040 #ifndef PinchingDamage_H
00041 #define PinchingDamage_H
00042 
00043 #include <UniaxialMaterial.h>
00044 #include <Vector.h>
00045 #include <stdio.h>
00046 
00047 class DamageModel;
00048 
00049 class PinchingDamage : public UniaxialMaterial  
00050 {
00051  public:
00052   PinchingDamage();
00053   PinchingDamage(int tag, Vector inputParam , DamageModel *strength, DamageModel *stiffness, DamageModel *accelerated, DamageModel *capping );
00054   virtual ~PinchingDamage();
00055 
00056   const char *getClassType(void) const {return "PinchingDamage";};  
00057   int setTrialStrain(double d, double strainRate = 0.0);
00058   double getStrain(void);
00059   
00060   double getStress(void);
00061   double getTangent(void);
00062   double getInitialTangent(void);
00063   int commitState(void);
00064   int revertToLastCommit(void);    
00065   int revertToStart(void);  
00066   
00067   //virtual
00068   UniaxialMaterial *getCopy(void);
00069   
00070   int sendSelf(int commitTag, Channel &theChannel);  
00071   int recvSelf(int commitTag, Channel &theChannel,
00072                FEM_ObjectBroker &theBroker);    
00073   
00074   void Print(OPS_Stream &s, int flag =0);
00075   
00076  protected:
00077   void envelPosCap(double fy, double alfaPos, double alfaCap,
00078                    double cpDsp, double d, double *f, double *ek );
00079   
00080   void envelNegCap(double fy, double alfaNeg, double alfaCap,
00081                    double cpDsp, double d, double *f, double *ek);
00082   
00083   void recordInfo(int cond =0);
00084   
00085   
00086  private:
00087   
00088   // Input parameters
00089   double elstk,fyieldPos,fyieldNeg,alpha,Resfac; // Properties
00090   double capSlope,capDispPos,capDispNeg;         // Cap
00091   double fpPos,fpNeg,a_pinch;                    // Pinching
00092   
00093   // Parameters calculated from input data
00094   double dyieldPos,dyieldNeg;
00095   DamageModel *StrDamage;
00096   DamageModel *StfDamage;
00097   DamageModel *AccDamage;
00098   DamageModel *CapDamage;
00099   
00100   
00101   double hsTrial[24], hsCommit[24], hsLastCommit[24];
00102   
00103 };
00104 
00105 #endif

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