TheEverest
Mechanical
I found dissimilarity to calculate Sds in Annex E. The formula given in the nomenclature and E.4.6.1-1 differ from each other, one formula uses Ss whereas the other uses S0. Can anyone please help me?
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Formula to calculate Sds(spectral response acceleration parameter at T=0.2sec ..)
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TheEverest
Mechanical
Thank you HTURKAK for your concern and quick reply. But I couldn't exactly find in E.4 about using Ss instead of S0. Can you please be more specific?
HTURKAK
Structural
- Jul 22, 2017
- 3,359
[quote...... But I couldn't exactly find in E.4 about using Ss instead of S0. Can you please be more specific?][/quote]
Your question implies the site is located at ( SITES NOT DEFINED BY ASCE 7 METHODS ) and If no response spectra shape is prescribed and only the peak ground acceleration, SP
Ss = 2.5 SP
S1 = 1.25 SP
S0 =Mapped, maximum considered earthquake, 5% damped, spectral response acceleration parameter at a period of zero
seconds (peak ground acceleration for a rigid structure), %g ( this event return period is about 2500 years ) and (usually referred to as the peak ground acceleration). Unless otherwise specified or determined, S0 shall be defined as 0.4SS when using the mapped methods.
Q =Scaling factor from the MCE to the design level spectral accelerations ( the scaling factor to obtain associated with the event having a 10% probability of exceedance in 50 years. That is, recurrence interval of 475 years ); equals 2/3 for ASCE 7
SS = Mapped, maximum considered earthquake, 5% damped, spectral response acceleration parameter at short periods (0.2 sec), %g
These are all copy and paste from API 650 App.E and EC. I do not have any input. I also added the snap from App.EC which illustrates the notations.
In your case, pls be more specific.. Where is your site located when you look to E.4 ( E.4.1 thru E.4.3) ?..
Your question implies the site is located at ( SITES NOT DEFINED BY ASCE 7 METHODS ) and If no response spectra shape is prescribed and only the peak ground acceleration, SP
Ss = 2.5 SP
S1 = 1.25 SP
S0 =Mapped, maximum considered earthquake, 5% damped, spectral response acceleration parameter at a period of zero
seconds (peak ground acceleration for a rigid structure), %g ( this event return period is about 2500 years ) and (usually referred to as the peak ground acceleration). Unless otherwise specified or determined, S0 shall be defined as 0.4SS when using the mapped methods.
Q =Scaling factor from the MCE to the design level spectral accelerations ( the scaling factor to obtain associated with the event having a 10% probability of exceedance in 50 years. That is, recurrence interval of 475 years ); equals 2/3 for ASCE 7
SS = Mapped, maximum considered earthquake, 5% damped, spectral response acceleration parameter at short periods (0.2 sec), %g
These are all copy and paste from API 650 App.E and EC. I do not have any input. I also added the snap from App.EC which illustrates the notations.
In your case, pls be more specific.. Where is your site located when you look to E.4 ( E.4.1 thru E.4.3) ?..
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