OpenSees » SRC » reliability » domain » modulatingFunction

GammaModulatingFunction.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: 1.3 $
00026 // $Date: 2003/10/27 23:04:40 $
00027 // $Source: /usr/local/cvs/OpenSees/SRC/reliability/domain/modulatingFunction/GammaModulatingFunction.cpp,v $
00028 
00029 
00030 //
00031 // Written by Terje Haukaas (haukaas@ce.berkeley.edu)
00032 //
00033 
00034 #include <GammaModulatingFunction.h>
00035 #include <ModulatingFunction.h>
00036 #include <classTags.h>
00037 
00038 
00039 GammaModulatingFunction::GammaModulatingFunction(int tag,
00040                                                                                                  Filter *theFilt,
00041                                                                                                  double pa,
00042                                                                                                  double pb,
00043                                                                                                  double pc)
00044 :ModulatingFunction(tag,MODULATING_FUNCTION_gamma)
00045 {
00046         a = pa;
00047         b = pb;
00048         c = pc;
00049         theFilter = theFilt;
00050 }
00051 
00052 GammaModulatingFunction::~GammaModulatingFunction()
00053 {
00054 }
00055 
00056 double
00057 GammaModulatingFunction::getAmplitude(double time)
00058 {
00059         return ( a * pow(time,b) * exp(-c*time)  );
00060 }
00061 
00062 Filter *
00063 GammaModulatingFunction::getFilter()
00064 {
00065         return theFilter;
00066 }
00067 
00068 double
00069 GammaModulatingFunction::getMaxAmplitude()
00070 {
00071         return ( a * pow( (b/c), b) * exp(-b) );
00072 }
00073 
00074 void
00075 GammaModulatingFunction::Print(OPS_Stream &s, int flag)  
00076 {
00077 }
00078

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