Calculation help for thru bolt in old double wythe brick wall
Calculation help for thru bolt in old double wythe brick wall
(OP)
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!
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!
RE: Calculation help for thru bolt in old double wythe brick wall
Also what is the basis of your allowable bearing stress range?
RE: Calculation help for thru bolt in old double wythe brick wall
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.
RE: Calculation help for thru bolt in old double wythe brick wall
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
RE: Calculation help for thru bolt in old double wythe brick wall
Hope this helps.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Calculation help for thru bolt in old double wythe brick wall
msquared48 (Mike) - thanks for the references and Tacoma printout!!!