ASCE 7-05 Possible Typo
ASCE 7-05 Possible Typo
(OP)
I've stumbled on something that I'd like to run past some seasoned earthquake structural engineers:
In ASCE 7-05, equations 15.4-2 and 15.4-4, the variable S1 is used. It seems to me an SM1 or SD1 should be there because S1 is not adjusted for soil type or spectral response. Is this a typo or was it really intended to be this way?
My case is for soil class D and the S1 numbers on the map are based on soil class B. The Fv and Fa site coefficients are pretty substantial to make soil type changes (Tables 11.4-1 and 11.4-2). If S1 is used and it is supposed to be SM1 or SD1, the result would be very unconservative.
In ASCE 7-05, equations 15.4-2 and 15.4-4, the variable S1 is used. It seems to me an SM1 or SD1 should be there because S1 is not adjusted for soil type or spectral response. Is this a typo or was it really intended to be this way?
My case is for soil class D and the S1 numbers on the map are based on soil class B. The Fv and Fa site coefficients are pretty substantial to make soil type changes (Tables 11.4-1 and 11.4-2). If S1 is used and it is supposed to be SM1 or SD1, the result would be very unconservative.






RE: ASCE 7-05 Possible Typo
In short, I don't think that this is a typo and it probably isn't unconservative because it defines the lower bound, and 15.4-1 and 15.4-2 is more severe than the minimums in 12.8.
RE: ASCE 7-05 Possible Typo
If anyone has hard knowledge of this being the case, please weigh in.
Thanks