OpenSees » SRC » reliability » domain » modulatingFunction

KooModulatingFunction.cpp

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00001 /* ****************************************************************** **
00002 **    OpenSees - Open System for Earthquake Engineering Simulation    **
00003 **          Pacific Earthquake Engineering Research Center            **
00004 **                                                                    **
00005 **                                                                    **
00006 ** (C) Copyright 2001, 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 ** Reliability module developed by:                                   **
00020 **   Terje Haukaas (haukaas@ce.berkeley.edu)                          **
00021 **   Armen Der Kiureghian (adk@ce.berkeley.edu)                       **
00022 **                                                                    **
00023 ** ****************************************************************** */
00024                                                                         
00025 // $Revision: 1.1 $
00026 // $Date: 2003/10/27 23:04:40 $
00027 // $Source: /usr/local/cvs/OpenSees/SRC/reliability/domain/modulatingFunction/KooModulatingFunction.cpp,v $
00028 
00029 
00030 //
00031 // Written by Terje Haukaas (haukaas@ce.berkeley.edu)
00032 //
00033 
00034 #include <KooModulatingFunction.h>
00035 #include <ModulatingFunction.h>
00036 #include <classTags.h>
00037 
00038 
00039 KooModulatingFunction::KooModulatingFunction(int tag,
00040                                                                                                  Filter *theFilt, 
00041                                                                                                  double pt1,
00042                                                                                                  double pt2)
00043 :ModulatingFunction(tag,MODULATING_FUNCTION_trapezoidal)
00044 {
00045         t1 = pt1;
00046         t2 = pt2;
00047 
00048         if (t1>t2 ) {
00049                 opserr << "WARNING: Inconsistent input to Koo Modulating Function" << endln;
00050         }
00051 
00052         theFilter = theFilt;
00053 }
00054 
00055 KooModulatingFunction::~KooModulatingFunction()
00056 {
00057 }
00058 
00059 double
00060 KooModulatingFunction::getAmplitude(double time)
00061 {
00062         double amplitude;
00063         if (time < 0.0) {
00064                 amplitude = 0.0;
00065         }
00066         else if (time < t1) {
00067                 amplitude = time*time/25.0; 
00068         }
00069         else if (time < t2) {
00070                 amplitude = 1.0;
00071         }
00072         else {
00073                 amplitude = exp(-0.5*(time-10.0));
00074         }
00075 
00076         return amplitude;
00077 }
00078 
00079 Filter *
00080 KooModulatingFunction::getFilter()
00081 {
00082         return theFilter;
00083 }
00084 
00085 double
00086 KooModulatingFunction::getMaxAmplitude()
00087 {
00088         return 1.0;
00089 }
00090 
00091 void
00092 KooModulatingFunction::Print(OPS_Stream &s, int flag)  
00093 {
00094 }
00095

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