×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Seismic Analysis of Underground Cut and Cover Structures

Seismic Analysis of Underground Cut and Cover Structures

Seismic Analysis of Underground Cut and Cover Structures

(OP)
How do other engineers model these types of structures for seismic analysis?  I have not found much guidance on these type of structures.

RE: Seismic Analysis of Underground Cut and Cover Structures

It's a displacement based design. You will need to find differential displacements between base slab and roof slab due to EQ motions. You will find all the principles described in this paper:
http://www.pbworld.com/library/fellowship/wang/

 

RE: Seismic Analysis of Underground Cut and Cover Structures

(OP)
Thanks, it appears to concur with my line of thought on this subject.  I have used compression only springs in the past.  Finding non-linear spring data is probably a challenge.  I have heard of FLAC and see another one SHAKE is there one you know of and could recommend with regards to ease of use and processing time for complex finite element (not frame)structures.

VOD

RE: Seismic Analysis of Underground Cut and Cover Structures

A few points:

1. Following Wang's paper no soil lateral springs needed. Equivalent (pseudo) earth pressure will be applied to mimic displacements at the top of the box.
2. Geotechnical engineer may use SHAKE to compute free-field displacements in the soil.
3. FLAC is a great program for excavations and minig, but it requires a capable person who will be working with it full time, going to the training, conferences and talking to the support (which is very good). Learning curve is VERY steep. I would leave it to FLAC experienced Geotech to supply you with equivalent loads/displacements. Also FLAC is weak in modeling frame elements it's more catered for plates and bricks.
 

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!


Resources