×
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

ASCE7-02, 7.7.2 Adjacent Structures

ASCE7-02, 7.7.2 Adjacent Structures

ASCE7-02, 7.7.2 Adjacent Structures

(OP)
Could someone review this paragraph in ASCE7-02 and explain what they are trying to tell me?  My confusion is with the "factor" in the last sentence, (20s)/20.  To me that equals "s", but then what? Do you divide it into or subtract it from something???

The problem I am looking into is putting a new, taller addition next to an existing, lower roof building.  What spacing is needed to ensure no snow drift load on the lower roof?  In the old State of Wisconsin Building Code (I think it was adopted from the Canadian Code) they used a dimension of 15'.  I want to design the new addition roof with a step in it, so the new roof adjacent to the existing roof is at the same elevation for a distance equal to "s" and then step up to full height.

RE: ASCE7-02, 7.7.2 Adjacent Structures

(OP)
Anyone out there?  I'm just wondering if my copy of the ASCE7-02 code is the only one with this misprint and I would like to confirm what the equation should be.  I sent an e-mail to ASCE and haven't heard from them either!  Is this just a trivial question that I don't see the answer to?

RE: ASCE7-02, 7.7.2 Adjacent Structures

From my interpretation....The paragraph reads that if an adjacent structure is within 20 ft of a roof then the drift load is to be reduced by a factor (20*s)/20, where s is in feet.  I take this to mean that is the structure is 5 feet away, you would take (20*5)/20 = 5, then reduce the drift load by 1/5.

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