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Concrete04.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 **                                                                    **
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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: 1.4 $
00022 // $Date: 2006/08/03 23:42:19 $
00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/uniaxial/Concrete04.h,v $
00024                                                                         
00025                                                                         
00026 #ifndef Concrete04_h
00027 #define Concrete04_h
00028 
00029 // File: Concrete04.h
00030 //
00031 // Written: N.Mitra (nmitra@u.washington.edu)
00032 // Created: 09/04
00033 // Revision: A
00034 //
00035 // Description: This file contains the class definition for 
00036 // Concrete04.h 
00037 //   - No tension 
00038 //   - Linear unloading/reloading
00039 //
00040 // What: "@(#) Concrete04.h, revA"
00041 // Revision: 1. Adding in Exponential tension part (05-16-05)
00042 
00043 #include <UniaxialMaterial.h>
00044 
00045 class Concrete04 : public UniaxialMaterial
00046 {
00047  public:
00048 //  Concrete04 (int tag, double fpc, double eco, double ecu, double Ec0, double fct);
00049   Concrete04 (int tag, double fpc, double eco, double ecu, double Ec0, double fct, double etu);  
00050   Concrete04 (int tag, double fpc, double eco, double ecu, double Ec0, double fct, double etu, double beta);
00051   Concrete04 (int tag, double fpc, double eco, double ecu, double Ec0);
00052   Concrete04 ();
00053   ~Concrete04();
00054 
00055   const char *getClassType(void) {return "Concrete04";};
00056   
00057   int setTrialStrain(double strain, double strainRate = 0.0); 
00058   double getStrain(void);      
00059   double getStress(void);
00060   double getTangent(void);
00061   double getInitialTangent(void) {return Ec0;}
00062   
00063   int commitState(void);
00064   int revertToLastCommit(void);
00065   int revertToStart(void);        
00066   
00067   UniaxialMaterial *getCopy(void);
00068   
00069   int sendSelf(int commitTag, Channel &theChannel);  
00070   int recvSelf(int commitTag, Channel &theChannel, 
00071                FEM_ObjectBroker &theBroker);    
00072   
00073   void Print(OPS_Stream &s, int flag =0);
00074   
00075   // LOWES: add function for use with variable hinge lnegth model
00076   int getMaterialType(void);
00077   // LOWES: end
00078   
00079  protected:
00080   
00081  private:
00082   /*** Material Properties ***/
00083   double fpc;    // Compressive strength
00084   double epsc0;  // Strain at compressive strength
00085   double epscu;  // Strain at crushing strength
00086   double Ec0;    // initial tangent
00087   double fct;   // Concrete tensile strength
00088   double etu;   // ultimate tensile strain              
00089   double beta;  // exponential curve parameter, residual stress (as a factor of ft)
00090   // at etu. 
00091   
00092   /*** CONVERGED History Variables ***/
00093   double CminStrain;   // Smallest previous concrete strain (compression)      
00094   double CmaxStrain;  
00095   double CunloadSlope; // Unloading (reloading) slope from CminStrain
00096   double CendStrain;   // Strain at the end of unloading from CminStrain
00097   double CcompStrain;   // strain value at which the compression unloading intersects the   
00098   // zero stress value or the strain value at which tensile reloading starts.                                  
00099   double CUtenStress;      // tensile stress value at which unloading begins
00100   double CUtenSlope;      // unloading tensile slope value
00101   
00102   /*** CONVERGED State Variables ***/
00103   double Cstrain;
00104   double Cstress;   
00105   double Ctangent;      // Don't need Ctangent other than for revert and sendSelf/recvSelf
00106   // Storing it is better than recomputing it!!!
00107   
00108   double TminStrain;
00109   /*** TRIAL History Variables ***/      double TmaxStrain;
00110   double TunloadSlope;
00111   double TendStrain;
00112   double TcompStrain;
00113   double TUtenStress;
00114   double TUtenSlope;
00115   
00116   /*** TRIAL State Variables ***/
00117   double Tstrain;
00118   double Tstress;
00119   double Ttangent; // Not really a state variable, but declared here
00120   // for convenience
00121   
00122   void CompReload(void);
00123   void CompEnvelope(void);
00124   void setCompUnloadEnv(void);
00125   void TensReload(void);
00126   void TensEnvelope(void);
00127   void setTenUnload(void);
00128 };
00129 
00130 
00131 #endif

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