×
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

Construction Time Wind Load
3

Construction Time Wind Load

Construction Time Wind Load

(OP)
What is the minimum wind load used to check erection time conditions?

Or where is this issue well covered?

Assume you have to erect a long span truss on temporary structure on an open terrain at elevation  above 10meters(33ft). Workers will be working on the temporary structure for at least two weeks.

RE: Construction Time Wind Load

An alternate approach, that may apply to your situation, is to check out the "California Falsework Manual" (free .pdf download at this link)
http://www.dot.ca.gov/hq/esc/construction/Manuals/Falsework/Falsework.htm

Chapter 3 covers "Design Consideration". Starting on page 3-4 there is a discussion of allowable horizontal construction loads (from any source, wind included). This manual limits allowable horizontal forces to 2% of total dead load. Ways to back-figure the allowable wind speed are discussed.

It is interesting that the manual (accurately, in my opinion) points out that there is no need for precise assumpitions and calculations since the whole situation is complex and changing as work progresses.

www.SlideRuleEra.net

RE: Construction Time Wind Load

UcfSE - you're just a second faster on the draw....way to go.

RE: Construction Time Wind Load

...great minds think alike.

RE: Construction Time Wind Load

That's what I was thinking when I saw that Thanks JAE

RE: Construction Time Wind Load

(OP)
I am going to purchase that AISC spec, but if you find time you might what to brief me on the level of wind mentioned in the spec

European draft code hints a wind speed of return period of 2 years to be used in all erection jobs.

But as you might know such a general statement can be very annoying because wind speeds as used in ASCE I guess are 50 year winds and they are MEAN values measured at 33ft (10m) height on a clear terrain with NO GUST taken into account.You take into accout gusts etc with a separate factor. You convert that to 10 year wind by some rules of thumb like factor 0.75. No joke I will never guess what 2 year no gust mean wind speed will mean what!

Winds cited in Russian codes can be seemingly very low, while in fact they are based on a different set of measurements which I have never found to time to fully study given the language barrier.

(Some codes tend to mention gust speeds as basis of wind data).

Thanks & regs

IJR

RE: Construction Time Wind Load

You convert wind speeds based on return period with a table in the ASCE 7 that gives you factors by which to multiply the 50-year wind speed for the given return period you want.  

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