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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: 2001/05/03 06:38:16 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/Concrete01.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef Concrete01_h
00027 #define Concrete01_h
00028 
00029 // File: Concrete01.h
00030 //
00031 // Written: MHS 
00032 // Created: 06/99
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for 
00036 // Concrete01.h adapted from Concr1.f90 (Filippou)
00037 //   - Modified Kent-Park envelope
00038 //   - No tension
00039 //   - Linear unloading/reloading
00040 //
00041 // What: "@(#) Concrete01.h, revA"
00042 
00043 
00044 #include <UniaxialMaterial.h>
00045 
00062 class Concrete01 : public UniaxialMaterial
00063 {
00064  public:
00066   Concrete01 (int tag, double fpc, double eco, double fpcu, double ecu);
00067 
00069   Concrete01 ();
00071   ~Concrete01();
00072 
00074       int setTrialStrain(double strain, double strainRate = 0.0); 
00076       int setTrial (double strain, double &stress, double &tangent, double strainRate = 0.0);
00078       double getStrain(void);      
00080       double getStress(void);
00082       double getTangent(void);
00084       double getSecant (void);
00085 
00087       int commitState(void);
00089       int revertToLastCommit(void);    
00091       int revertToStart(void);        
00092 
00094       UniaxialMaterial *getCopy(void);
00095     
00097       int sendSelf(int commitTag, Channel &theChannel);  
00099       int recvSelf(int commitTag, Channel &theChannel, 
00100      FEM_ObjectBroker &theBroker);    
00101     
00103       void Print(ostream &s, int flag =0);
00104 
00105    protected:
00106 
00107    private:
00108       /**** Material Properties ***/
00109       double fpc;    
00110       double epsc0;  
00111    double Ec0;
00113       double fpcu;   
00114       double epscu;  // Strain at crushing strength
00115 
00116       /**** CONVERGED History Variables ***/
00117       double CminStrain;   
00118       double CunloadSlope; 
00119       double CendStrain;   // Strain at the end of unloading from CminStrain
00120 
00121       /**** CONVERGED State Variables ***/
00122       double Cstrain;
00124       double Cstress;   
00126       double Ctangent; // Don't need Ctangent other than for revert and sendSelf/recvSelf
00127       // Storing it is better than recomputing it!!!
00128 
00129       /**** TRIAL History Variables ***/
00130       double TminStrain;
00132       double TunloadSlope;
00134       double TendStrain;
00135 
00136       /**** TRIAL State Variables ***/
00137       double Tstrain;
00139       double Tstress;
00141       double Ttangent; // Not really a state variable, but declared here
00143 
00144       void determineTrialState (double dStrain);
00145 
00147       void reload();
00149       void unload();
00151       void envelope();
00152 };
00153 
00154 
00155 #endif
00156 
00157