×
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

Elevated Platform - Seismic Attachment to Bridge Structure that allows thermal expansion/contraction

Elevated Platform - Seismic Attachment to Bridge Structure that allows thermal expansion/contraction

Elevated Platform - Seismic Attachment to Bridge Structure that allows thermal expansion/contraction

(OP)

I am interested in your thoughts regarding a connection between a 20'x60' gravity-only supported elevated platform consisting of tube steel columns, WF beams, and composite deck to a 150' span of a new bridge. The elevated platform connections are all pinned, so it does not resist lateral loads. The plan is to connect one of the 60' sides of the elevated platform to the bridge structure with a connection that has both horizontal and vertical slotted holes (horizontal slots on the steel element tied to the platform and vertical slots on the steel element tied to the bridge). This will allow for differential vertical deflections under live load and allow the bridge to thermally expand and contract longitudinally without tearing up the platform structure connections.

In a design seismic event, the idea is that as the bridge shakes, the platform connections will engage and the platform will go along for the ride.

ASCE 7-05 sections 12.1.3 and 12.1.4 require a positive connection between all interconnecting parts of the structure.

1) Does the code allow a slotted connection in the direction of seismic loading?

2) Do you think that the slotted holes will result in larger dynamic forces during a design seismic event?

Thanks for your input.

I appreciate it.

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