×
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

Beam supporting masonry

Beam supporting masonry

Beam supporting masonry

(OP)
Curious what others are using as an allowable deflection for beams or slabs supporting masonry.  I know ACI530 states span/600 but not more than 0.3 inches for unreinforced but I've been seeing it a lot on thin PT flat slabs and cantilevers that certainly don't meet this criteria.  I realize that it's often concealed so some cracking is tolerable but how much deflection is too much?

RE: Beam supporting masonry

I follow ACI 530.  But if you can accurately predict WHEN the masonry will be laid, some of the beam load can be omitted from the deflection calculation (e.g., if the roof or floor framing is installed prior to the masonry being built, the dead load deflection will already have taken place and need not be considered in the deflection check).

DaveAtkins

RE: Beam supporting masonry

If it's reinforced masonry, typically I use the span/600 and omit the 0.3-inch limit.  For unreinforced I would use the same but include the 0.3-inch limit.  That's used with the D+L combo.

RE: Beam supporting masonry

The rupture stress of the masonry assembly and the use of the masonry assembly will have to be known to make any judgement on how much deflection is tolerable.  Can you live with a cmu wall completely cracked through the face shell?  What if it is used to resist lateral loads?

RE: Beam supporting masonry

Don't forget, if it is a long span lintel, to have control joints at the lintel ends. The end rotation of the lintel can cause cracking of at the ends.

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