Seismic Zone Maps?? Where can I find?
Seismic Zone Maps?? Where can I find?
(OP)
Does anyone know where to find the seismic zone maps (I-V, I believe). I think they were in ASCE 7-02. I don't want to purchase ASCE 7-02 because I only need to look at the map once. Waste of money.
Does anyone know where I can find these online for free? I can find all sorts of more detailed maps on USGS site... spectral acceleration, ground movement (?), etc., but not the simple seismic zone maps. Please help a brotha out.
Peace,
N-Butter
Does anyone know where I can find these online for free? I can find all sorts of more detailed maps on USGS site... spectral acceleration, ground movement (?), etc., but not the simple seismic zone maps. Please help a brotha out.
Peace,
N-Butter






RE: Seismic Zone Maps?? Where can I find?
RE: Seismic Zone Maps?? Where can I find?
IBC 2006 appears to still have zones, or "Site Classes".
I'm not a structural guy. Did a little bit of foundation design and drafting when I was working for small consulting firm.
I'm just filling out a builder's risk questionnaire and it asks what seismic zone (numerical) the project is in. Looks like they need to update their questionnaire. I just gave them the IBC Site Class D.
NB
RE: Seismic Zone Maps?? Where can I find?
RE: Seismic Zone Maps?? Where can I find?
In current codes in the US, you use the site class (describes the underlying soils - rock or softer?), you use the short and long term accellerations (S1 and Ss), building period, and other factors to determine a seismic design category (A through F) to design for seismic.
The older seismic zones (0 through 4) are somewhat replaced by the seismic design categories.
RE: Seismic Zone Maps?? Where can I find?
RE: Seismic Zone Maps?? Where can I find?
That link definitely is full of information. I guess I just don't know how to get from there to determining a Seismic Design Category.
I know I'm on a "Site Class D" by the information I've gleaned from the geotech report. Through the link I was able to play around and get the Maximum Ground Motion (of 1s spectral response acceleration) maps.
Now I think I'm more confused than ever though. How can I use this information to determine the Seismic Design Category?
Hell, I don't even know if I'm doing the right analysis with that Java applet. I used the "NEHRP Recommended Provisions for Seismic Regulations for New buildings other structures". There's several other analysis methods such as:
-Probabilistic hazard curves
-Probabilistic Uniform Hazard Response Spectra
-ASCE 7 Standard, Min design loads
-IBC
-IRC
-NFPA 5000 Building Construction and Safety Code
Man, I'm totally lost now. Is there a certain analysis that I need to perform to determine this "Seismic Design Category", or can I get there from any of these analysis methods?
If anyone could give a brief summary of how to use this tool to determine the Seismic Design Category, I would be extremely grateful.
-NB
RE: Seismic Zone Maps?? Where can I find?
RE: Seismic Zone Maps?? Where can I find?
http://www.bssconline.org/pubs/downloads.html
http://www
(CodeMaster - Seismic Design Category (2006 IBC/ ASCE 7-05))-$5
you could probably ask the geotech for assistance...we typically provide seismic design parameters on our projects. the links above will put you on the info (plus a whole lot more) you need. i suggest purchasing a copy of ASCE7-05...well worth the money.
you should probably (guessing here) be using the IBC 2006 maps with ~2475 yr return period (2%/50). again i'd suggest you receive input from the geotech...an experienced engineer should be able to get you to the SDC with all the parameters relatively "easily".
i won't go wading off in to site classification and the different approaches to get this parameters. however, taking a more sophisticated approach could save the client a substantial amount of money.
good luck.