Isolator2spring.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: 1.1 $ 00022 // $Date: 2006/01/17 20:44:32 $ 00023 // $Source: /usr/local/cvs/OpenSees/SRC/material/section/Isolator2spring.h,v $ 00024 00025 00026 // Written: K. Ryan 00027 // Created: September 2003 00028 // Updates: November 2005 00029 // 00030 // Description: This file contains the class implementation for a "two-spring isolator" 00031 // material. This material is based on the two-spring model originally developed by 00032 // Koh and Kelly to represent the buckling behavior of an elastomeric bearing. The 00033 // material model has been modified to include material nonlinearity and optional 00034 // strength degradation. 00035 00036 #ifndef Isolator2spring_h 00037 #define Isolator2spring_h 00038 #include <SectionForceDeformation.h> 00039 00040 #include <Matrix.h> 00041 #include <Vector.h> 00042 #include <ID.h> 00043 00044 class Isolator2spring : public SectionForceDeformation 00045 { 00046 public: 00047 Isolator2spring(int tag, double tol_in, double k1_in, double Fy_in, double kb_in, double kvo_in, 00048 double hb_in, double Pe_in, double po_in); 00049 Isolator2spring(); 00050 ~Isolator2spring(); 00051 00052 int setTrialSectionDeformation(const Vector &v); 00053 const Matrix &getSectionTangent(void); 00054 const Matrix &getInitialTangent(void); 00055 const Vector &getStressResultant(void); 00056 const Vector &getSectionDeformation(void); 00057 00058 int commitState(void); 00059 int revertToLastCommit(void); 00060 int revertToStart(void); 00061 00062 SectionForceDeformation *getCopy(void); 00063 const ID &getType(void); 00064 int getOrder(void) const; 00065 00066 int sendSelf(int commitTag, Channel &theChannel); 00067 int recvSelf(int commitTag, Channel &theChannel, 00068 FEM_ObjectBroker &theBroker); 00069 00070 void Print(OPS_Stream &s, int flag = 0); 00071 00072 protected: 00073 00074 private: 00075 double tol; 00076 double k1; 00077 double Fyo; 00078 double kbo; 00079 double kvo; 00080 double h; 00081 double Pe; 00082 double po; 00083 00084 double utpt[2]; 00085 double sP_n; 00086 double sP_n1; 00087 00088 double q_n; 00089 double q_n1; 00090 00091 double H; 00092 double pcr; 00093 00094 Vector x0; 00095 Matrix ks; 00096 static Vector f0; 00097 static Matrix df; 00098 static Vector s; 00099 static Vector s3; 00100 static ID code; 00101 }; 00102 00103 #endif
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