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Geo Struct Sparks LLC

When Mononobe-Okabe Equation Doesn't Work


 This blog is an area to try out new text or content on the website and get feedback on it before adding it to the site.

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Well yes, you can "break" this program

Posted by geostructsparks on 16 September, 2015 at 19:00

After selling this program for five years, suddenly two separate clients came up with scenarios that "broke" WASP within the same month. By break, I don't mean destroy the software, but rather they managed to create scenarios with infinite results on level ground, for separate projects, one in Japan, and one in Panama.


The examples were both where the designers were in high seismic areas, were on level ground, wanted to simulate "non-moving (at-rest) Ko" conditions, and t...

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Modeling Kae with Slope Stability Programs

Posted by geostructsparks on 11 September, 2015 at 5:20

This is a continuation of the previous blog entry - where the client was running into a numerically ridiculous result (basically unstable) because the horizontal earthquake coefficient selected was really high (0.75 g, or 1.25 x PGA, rather than the typical 0.5 x PGA) and the soil friction angle was low.  WASP does not produce a meaningful result, because the resulting linear failure envelope is at 1 degree from horizontal - basically an infinite failure length on level ground. (It would...

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Discussion Published in ASCE JGGE

Posted by geostructsparks on 7 September, 2012 at 5:50

My discussion on Atik and Sitar's paper was published in the ASCE JGGE August 2012 issue (Jonathan Pease, Discussion of  Al Atik, L.  and N. Sitar, 2010, Seismic Earth Pressures on Cantilever Retaining Structures, ASCE Journal of Geotechnical and Geoenvironmental Engineering).  Much of the discussion and questions I included in the discussion are included under the Nay Sayers sect...

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Mandatory Upgrade March 2012

Posted by geostructsparks on 28 March, 2012 at 8:30

In the first released version of the program in March 2010, we included a mandatory upgrade feature where the program, either in demo mode or with a license, stopped working 2 years after last compiled.  When the progam is opened, the "About" screen opens but there is a message in red "Suggesting" that the user go to this website and download a new version.  Rather than continue to the main program, the program closes after this screen.  This was to make certain that we could c...

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Errata on Paper

Posted by geostructsparks on 24 July, 2010 at 9:26

There is an error in the version of the paper to be published online and in the paper proceedings version for the Toronto Conference.  Equation 10, which computes the mass or weight of the soil wedge, has four additive terms.  Each term should include gamma, or the unit weight; it is missing from one of the terms.  This is corrected in the version available for download from the "Parameter Guide" page as of the date of this entry.  This hopefully should be obvious to anyon...

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WASP Conference Paper Accepted

Posted by geostructsparks on 4 March, 2010 at 20:23

Our paper on "Active Wedge Analysis of Seismic Pressure for Retained Slopes" has been accepted for the 9th US National/10th Canadian Conference in Earthquake Engineering has been accepted.  This conference is in July 2010 in Toronto, Ontario.  It provides a summary of the methodology and equations, and benefits of using this alternate method.

A preconference copy of the paper can be reached by the link in the start of the parameter guide.

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WASP 1.0.1 License Available

Posted by geostructsparks on 30 November, 2009 at 9:40

The WASP program is finally available for sale!  The last 2 to 3 weeks have been taken up with learning or trying to learn how to make the purchase work on the web.  There have been a number of obstacles thrown up, which I think we have finally overcome.  Its not elegant, but hopefully it works.  With this task completed, I intend to focus on writing up the online help.  I will have screen shots of the program up in the "About WASP" page in a day or two.


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