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This link allows you to use the zipcode of the site to look up seismic coefficients for various spectral responses at different exceedance probabilities. http://eqint.cr.usgs.gov/eq-men/html/zipcode-06.html

NASC: I do not have any articles on what you are looking for. Shale fills should not be placed as end dumped fills. The Kentucky Transportation Cabinet had problems with placing non-durable rock as end dumped fills. If your rock materials are not durable, you may want to reconsider how you...

ReSSA and ReSlope by Adama Engineering (www.reslope.com) can be used to analyze geotextile or geogrid reinforced soil slopes. ReSSA allows one to analyze more complicated geometries and foundation conditions than ReSlope Later versions of STABL can also analyze global stability of reinforced...

My experience with shale fill is in the Ohio and Kentucky area. The problem with using shale in our area,as any kind of fill, is that the shale particles are not durable. If it is placed as a durable rock, in larger pieces, over time the shale will weather in-place when subjected to water and...

If you are looking into producing guidelines for MSE walls (reinforced rock walls) you shold base it on the standard of practice. The standard of practice is the National Concrete and Masonry Association (NCMA) for commercial projects and AASHTO for tranportation projects. These design...

One possible solution would be articulated concrete block that would allow grass or vegetation to grow through openings in the blocks. This may work for light-duty traffic. Some actually come in mattresses that are tied to gether by steel cables that might help provide additional traffic...

I will attempt to answer your question as best I can and a s briefly as I can. Woven fabrics are individual threads (monofilaments, multifilaments or fibrillated yarns) or slit films and tapes that are actually woven on a loom. Typically, they have a very uniform appearance. Non-woven...

BigH: What probabilities are you basing the seismic peak ground accelerations on? They soud like 10% probability of exceedence in 50 years based on the 0.06g value for Dayton, Ohio. What probabilities of exceedence are most appropriate for SRW design, while still being in line with the...

I am curious as to how engineers in the U.S. are designing segmental retaining walls for seismic events using IBC or ASCE7. These documents use spectral response accelerations, which appear extremely conservative. I have typically seen peak ground accelerations at either 10% exceedence in 50...

Reviewing the ASCE7 documents and IBC 2000, it appears that these codes are extremely vague when it comes to selecting seismic design parameters for segmental retaining walls. The codes typicallys refer the designer to the spectral acceleration coefficients or say it is up to a geotechnical...