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

Existing Building Drift

Existing Building Drift

Existing Building Drift

Are there any instruments available to measure the drift of an existing building under wind loads?

RE: Existing Building Drift

A plumb bob placed in an elevator shaft may give you what you want.

RE: Existing Building Drift

Yes.  One easy way is to use an inclinometer hooked to a recording device.  This will allow you to catch peaks and to coordinate precise correlation with the wind load.  Ideally you would set up at least two inclinometers (two orthogonal directions), one digital anemometer, and several strain gages...all fed into one multi-channel data acquisition system.  This allows real-time monitoring, the features and anomalies of which can be overlaid on a single time scale to develop correlations.

Setups like this have been used in determining movements and stresses for blast or demolition operations (dropping a building in congested urban setting) as well as the recent,  highly sensitive moving of the Cape Hatteras Light House.

RE: Existing Building Drift

GPS instruments are now common. I am not sure they are accurate to the closest inch. Feet yes but maybe the better quality one can give outputs to higher accuracy. The trouble with plumb bobs is that they tend to move with the building mount , are very awkward and dangerous to record. Multi plex is usually technically tricky and not cheap.Triangulation with ground targets and cheap ruby lasers ( laser carpentry levels ). Best. CFPeng.

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


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