×
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 design for catwalk

Seismic design for catwalk

Seismic design for catwalk

(OP)
I am working on a catwalk design project in California. I am trying to find how to calculate the base shear for the structure. I ran through ASCE7-05 and IBC 2006 but I could not find a seismic design section talk about catwalk/bridge. I think the catwalk should fall between building structure and non-building structure. Please help.
Thanks

RE: Seismic design for catwalk

If braced frame then building. if cantilever columns then non-building.

RE: Seismic design for catwalk

In the older codes, this would fall under "Parts of a Structure" and be subjected to 30% of it's weight seimically.  I would have to check out the IBC for the applicable section now.

FYI:  You would get more suggestions here if you posted under the "Structural Engineering Other Topics" section of the forum.

Mike McCann
MMC Engineering

RE: Seismic design for catwalk

Mike:

Is the terminology "Structural Components" sounds right for
"Parts of a Structure"? Just curious.

RE: Seismic design for catwalk

(OP)
Thanks for the reply. My catwalk platform is supporting by series of steel columns w/ X steel braces in between. If the catwalk structure is defined as building structure, then I can use the equations in ASCE7 Chapter 12. For those coeffs within the equations, can I use Ct = .028, x = 0.8, R = 3.5?

RE: Seismic design for catwalk

Check the errata definition revision in Chapter 13, section 13.1.1, which sets out a limit between structural and non-structural component analysis requirements.

The addition in the errata states: "Where the weight of a non-structural component is greater than or equal to 25% of the effective seismic weight, W, of the structure as defined in section 12.7.2, the component shall be classified as a non-building structure and shall be designed in accordance with Section 15.3.2."

Mike McCann
MMC Engineering

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