seismic wall pressures

[geotis]

I found a 2014 thread addressing this issue but it is now closed.

OCGEO posted:

For a recent design of a non-yielding (at-rest) wall.....

For At-Rest Earth Pressure (level).... Ko = 1 - sin(phi) ---- Jaky, 1944
For At-Rest Seismic Earth Pressure.... Koe = 2*kh (where kh = 1/2 PGA-M) ---- Wood (1973); Whitman (1991); Al Atik and Sitar (2010)
For At-Rest Earth Pressure (sloping).... Ko = (1 - sin(phi))/(1 + sin(beta)) ---- Kezdi 1972
For At-Rest Static and Seismic with sloping backfill... K and Koe = ~2*M-O (Mononobe-Okabe for active earth pressure) ---- Wood (1973); Whitman (1991); Al Atik and Sitar (2010)

I would like to know whether triangular or trapezoidal or a combination two should be used for these values.

Thanks,

 

[msquared48]

The at rest pressures are either triangular or trapezoidal depending on any additional traffic or surcharge loading.

The seismic pressures are usually rectangular.

Mike McCann, PE, SE (WA)

 

[GPapazafeiropoulos]

See this thread

Best regards,

_______________________________________________
George Papazafeiropoulos
First Lieutenant, Infrastructure Engineer, Hellenic Air Force
Civil Engineer, M.Sc., Ph.D. candidate, NTUA
Email: gpapazafeiropoulos@yahoo.gr
Website:

http://users.ntua.gr/gpapazaf/