Seismic Lateral Earth Pressures

[geotis]

I read in a previous post that the inverted triangle was standard procedure as of about 10 years ago or so to determine lateral seismic pressures. I this is true, then what is the current standard?

Thanks,

 

[GeoPaveTraffic]

We recommend a retangular distribution.

Mike Lambert

 

[msquared48]

I can see the rectangular distribution as it is a combination of the triangular distribution pattern due to liquefaction, and the potential for ground movement at the higher elevations of the cut due to seismic action. That makes sense.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[geotis]

Thanks Mike,

Can you refer me to an example or describe the pressure distribution.

 

[Qshake]

The rectangular distribution is noted in the well referenced Soil Dyamnics by Shamsher Prakash. I'm sure it's in other well used documents such as NAVFAC or the Tri-Services Enginering Manual for US folks. Probably also in the USACE Engineering Manusl. It's widely accepted for some time now.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

 

[jkgeo]

While that is the most commonly accepted approach for seismic distribution of soil loads on retaining structures, you may want to consider if the loads even apply. Recent research at Davis by Nick Sitar, et. al has discussed seismic loading of walls.