Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations KootK on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Calculation help for thru bolt in old double wythe brick wall

Status
Not open for further replies.
4qualityce

4qualityce

Structural
Mar 31, 2008
6
I am looking for some help specifying through bolts in old (1940s) clay brick for a 2x roof ledger. Double wythe, 8 inch wall. The main loading will be from snow load. I am probably going to use somewhere between 300-600 psi for the old brick just because it is old based on another forum - it is in fair condition. I know I need to check:

1 - brick bearing
2 - all-thread shear/tension (minor wind loading)
3 - washer pullout
4 - ledger bearing

As an alternative, someone referenced that you can use L-bolt values. Does anyone have an example they could post? I am looking at about 240 PLF loading on the ledger.

Thanks!
 
Replies continue below

Recommended for you

Sort by date Sort by votes
What kind of bearing distribution are you going to assume for the brick bearing check?

Also what is the basis of your allowable bearing stress range?
 
Upvote 0 Downvote
Is the wall laid with a collar to make the two wythes act together for most uses?

If it is bonded, how far away would bonding units be?

The clamping action of a through bolt could crush the wall if the wythes are separate.

Dick

Engineer and international traveler interested in construction techniques, problems and proper design.
 
Upvote 0 Downvote
Some references from renovation job I did in Everett about 7 years ago:

1. 1997 UBC, Section 403 and Appendix Chapter 1

2. "Guidelines for the Seismic Retrofit of Existing Buildings", Chapter 1

3. City of Tacoma, "Seismic Restoration of Buildings", February 3, 1999

Also, here is half of an 11X17 page with some values you can use. I'll post the other half of the page in my next post.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
 
 http://files.engineering.com/getfile.aspx?folder=eec830b3-3653-4a47-bee9-8fb773085509&file=Masonry_Rosette_Capacities_Page_1_of_2.jpg
Upvote 0 Downvote
abusementpark - this is a common bond wall (with header course every 6-7 courses) and appears to be partially grouted between wythes, so no real collar.

msquared48 (Mike) - thanks for the references and Tacoma printout!!!

 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Sumsayso
  • Locked
  • Question
Structural Advice - Brick cracks near wall opening
Replies
14
Views
2K
phamENG
phamENG
destory
  • Question
Modifying an Existing ICF Wall
Replies
2
Views
2K
JAE
JAE
L
  • Question
What is the best strategy for shoring a structure during the partial demolition of a load-bearing wall in a renovation project?
Replies
3
Views
5K
Laura_mr
L
J
  • Locked
  • Question
Retaining wall replacement (TIMBER SHEETPILLING)
Replies
5
Views
3K
phamENG
phamENG
ikka
  • Locked
  • Question
Retrofitting RCC Wall with a hole
Replies
2
Views
3K
jayrod12
jayrod12

Part and Inventory Search

Sponsor

Back
Top Bottom