Design Spectral Response

[strikengineer]

Does anyone know of a good source for determining spectral response values for Alaska other than ASCE and IBC maps? I am reviewing some calculations, and came across SD1 and SDS values with resolution to the thousandths. Is there a source that provides this, or am I looking at someone’s work who had a really good eye for interpolation?

 

[SLTA]

There's a program out there that gives you Ss and S1 by zip code, but not to that degree of accuracy. There's a point at which the numbers don't even make sense to use, you know? I'd say go to the nearest tenth.

 

[OldPaperMaker]

strikengineer,
Go to

http://earthquake.usgs.gov/research/hazmaps/design/

and click on "Java Ground Motion Parameters Calculator". This will let you use zip codes or latitude & longitudes to find Sd1 & Sds.
You can get lat & longitude from Terraserver on the web.

I hope that this helps.

 

[UcfSE]

S_s and S₁ are in the maps, not S_Ds and S_D1. When you take the 2/3 factor to get to S_Ds and S_D1, you could get too many sig figs.

You might get more sigs figs from the NEHRP program, I can't remember. Try there, it's free to use.

 

[JAE]

I think UcfSE has it explained. It's sort of like this:

2 + 2 = 4.00000000