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#46592 - 01/06/12 07:30 AM ZPA for response spectrum analysis of earthquake
TRIPS Offline
Member

Registered: 12/08/09
Posts: 37
Loc: INDIA

1. As per Caesar help documents ,the ZPA entry in the Control Parameter input is only used with the Reg. Guide 1.60 shock spectra and the UBC shock spectra. If I am not using those pre-defined spectra, the ZPA input is not used.

Does this mean that the ZPA parameter automatically will be inactive if i am using some site specific response spectrum or response spectrum as per code IS1893 Part I & IV .

2.As a rule the modal ground acceleration taken from the response spectrum(site specific) is first divided by ratio R/I*g [ by {R/(Z/2)I*g} in case of IS1893 code specific response spectra] before using in response spectrum analysis .
As per IS 1893 , R= Response reduction factor to take into account the redundancy and ductility of structure , I=Importance factor assigned to structure as per category ,g = Gravitational acceleration , Z =Zone factor

As per my understanding this factor can be consider by Providing the value of factor R/I*g or {R/(Z/2)I*g} in the Spectrum load case tab . In this case the value of ZPA will be 1 .

Please respond !

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#46650 - 01/09/12 11:24 PM Re: ZPA for response spectrum analysis of earthquake [Re: TRIPS]
TRIPS Offline
Member

Registered: 12/08/09
Posts: 37
Loc: INDIA
Please help me to get the answer of above questions !

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