Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Makdisi & Seed Analysis

Makdisi & Seed Analysis

Makdisi & Seed Analysis

Sorry for the double post (seismology engineering), but thought some may not look in that forum.

I'm comparing seismic deformation of an embankment using the Makdisi & Seed approach to more recent methods by Bray et al (1997 and 2007).  I am finding at least two different versions of charts for the Makdisi & Seed method.  The one in the Kramer text has the period (To) of the embankment on one of the chart axes.  The other version of the chart does not have To.

I have two questions for anyone familiar with these charts:

1) Do they both give the same answers?

2) One one of the charts where you need to compute Kmax as a function of the embankment and potential failure surface geometry, the horizontal axis has Kmax/PGA/g.  Would you divide your PGA by g (32.2 fps^2) to come up with Kmax, or is this just indicating a divison by g to make Kmax dimensionless.  I thought the latter, but have seen the the divison done in the Kramer text and it would obviously make a big difference.


RE: Makdisi & Seed Analysis


I have photocopies of both the 1977 and 1978 papers by Makdisi and Seed and cannot find a figure where one of the axes is labeled only 'To'. The dimensions of the axes in these figures is 'U/kmax g To'. Note that Figure 10 in the 1978 paper is plotted incorrectly - the corresponding figure in the 1977 paper should be used.

I have not performed a Makdis-Seed analysis for many years, so I am afraid that I cannot respond to your whole question more helpfully.



Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close