The ASCE 7-05 / ASCE 7-10 spectrum is defined by a set of parameters defined in the code. The IBC 2006 and IBC 2009 codes refer directly to the ASCE 7-05 code. The IBC 2015 code refer directly to the ASCE 7-10 code.
The Eurocode 8 : 1994 spectrum is defined by a set of parameters defined in the code.
The Eurocode 8 : 2003 spectrum is defined by a set of parameters defined in the code.
The FEMA 356 spectrum is defined by a set of parameters defined in the code.
The GB 50011-2001 spectrum is defined by a set of parameters defined in the code.
In most cases a code based response spectrum is what is required, but on occasions it is useful to be able to generate a spectrum from a given time history. When selecting this option a time history must first be selected. This is a text file either in tab of comma separated form, or a PEER file.
The IBC 2000 spectrum is defined by a set of parameters defined in the code.
The IS 1893 (Part 1) : 2002 spectrum is defined by a set of parameters defined in the code.
The Ordinanza PCM 3274 (Italian) spectrum is defined by a set of parameters defined in the code.
The Eurocode 8 : 2004 spectrum is defined by a set of parameters defined in the code.
When a response spectrum is generated from a time history it can be have sharp peaks. A response spectrum analysis may have modes which are just off these peaks and so the response may be underestimated.
The UBC 1994 spectrum is defined by a set of parameters defined in the code.
The UBC 1997 spectrum is defined by a set of parameters defined in the code.
The user-defined spectrum must be defined externally and can be imported in this dialog.