×
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

Masonry Wall

Masonry Wall

Masonry Wall

(OP)
I have a situation where I have a 42' high 12" masonry wall which is exposed an exterior wind load (stair tower). So I'm treating it as a simple span.  I can reinforce it enough to take care of the stress.  Will deflection be an issue?  How is deflection calculated?  Thanks for your help.

RE: Masonry Wall

Consider the height to width ratio.  If the width of stair tower is narrow, you do not have to consider the wall as a simple span for the full 42' height.  You may design the wall to span horizontally between the cross walls, then design the cross walls to take the uniformly distributed load as a shear wall.

RE: Masonry Wall

(OP)
My wall is about 30' long.  I still think it would be much easier reinforcing vertically versus horizontally with that sort of span.  just my 2 cents.

RE: Masonry Wall

Wouldn't you need horizontal reinforcing regardless?

With the wall spanning vertically, deflection may be calculated using the formulas outlined in 1997 UBC Section 2108.2.4.  I do not have my copy of 2000 IBC and I haven't started using it (not adopted in my area yet) but I'm sure the concept is the same.

If you are in IBC-land, please respond where you find the code section.

RE: Masonry Wall

(OP)
In the past I've always used Dur-o-wall for horizontal reinforcing.  Maybe in this situation this isn't enough shear reinforcing.  I was thinking that providing bond beams and horizontal reinforcing approx. every other course would be more work than just providing vertical bars.

I did go back to my old 94 UBC and found my deflection criteria.

Lucky me, I am in IBC land.  I guess I did find the criteria in section 2108.5.  I guess I was thinking I could find it in one of the 18 million references the IBC uses.    

RE: Masonry Wall

Looking at this realistically, what you have is a 2-way bending situation, especially because you have a rectangle 30' x 42'. There are plenty of sources to help you estimate the maximum bending moments vertically and horizontally.
The deflection will realistically be much more manageable than the super-overconservative assumption of a 1' wide strip spanning 42' vertically.

RE: Masonry Wall

(OP)
SacreBleu,  I don't know if designing that way is a good way to approach this since a vertical control joint is going to be needed somewhere in this wall.

RE: Masonry Wall

If the stair tower is a square, 30' by 30', what is the need of the control joint?
If there is indeed a MCJ, then you are correct.

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