Column base plate A. bolt in canada
Column base plate A. bolt in canada
(OP)
I am aware of that in USA we need minimum 4 anchor bolts for steel column base plate as per OSHA. Any one knows what is requirement in Ontario, Canada. Any local code reference will be appreciated.






RE: Column base plate A. bolt in canada
Per my understanding, OSHA requires 4 bolts is out of concern of framing stability during erection/construction, for which has caused many tragic events, and lifes. It is worthy to take note on that when deal with steel constructions.
RE: Column base plate A. bolt in canada
Best regards,
BA
RE: Column base plate A. bolt in canada
and used two anchor bolts often. I am unware of any specific code requiring '4 anchors'.
RE: Column base plate A. bolt in canada
Dik
RE: Column base plate A. bolt in canada
The connection is required only to hold the parts in line, and two anchor bolts are generally sufficient
RE: Column base plate A. bolt in canada
RE: Column base plate A. bolt in canada
I agree with you on practical vs code. However, if you are in the US, beware the consequences of tragic events that involving OSHA violations. (Note: some of OSHA regulations are mandatory, some are not. Visit its website to post a question, or check with persons that familiar with OSHA rules.)
Does Canada have government agency similar to OSHA?
RE: Column base plate A. bolt in canada
RE: Column base plate A. bolt in canada
Thanks for the info.
OSHA has broad powers to enforce its regulations over every industrial settings, construction works, and pollution issues. Many of those regulations are not in the code, but to be complied. Otherwise the business may face hefty fines, or litigation brought by the government.
Regarding the 2 bolts/4 bolts issue, I vaguely remember there were several steel structure collapses during erection, that injured, or caused death of several construction workers. I believe the main cause of most collapses was lack of, or inadequate, lateral bracing/support, however, the 2 bolts pattern was cited along many other deficiencies, but was deemed easier to amend to be fool-proof. Thus given the birth of 4 bolts mandate. Well, I guess this mandate have caused heart burns and headaches of the pre-fabricated building manufactures, and the engineers that have to deal with them. I haven't heard any such (collapse) event lately, maybe it does improve construction safety.
RE: Column base plate A. bolt in canada
RE: Column base plate A. bolt in canada
Good point. Inevitably, 4 bolts pattern will draw some moment, however, it is far from fixed condition. Remember that only a small amount of rotation is needed to classify the connection as pinned. I could be wrong, 4 bolts pattern is used quite frequently and designed as pinned support, even prior to OSHA mandate. To increase moment capacity, it will require much more to accomplish that. But you are right, be prudent when column size vs base layout is close to the boder line.
RE: Column base plate A. bolt in canada
During the erection process, columns are not fixed at the base. Whether two, four, six, eight or twelve anchor bolts are specified, standard practice is to provide steel shims under the center of the column with no nuts on the anchor bolts. During erection, columns are not fixed against rotation at the base. The erectors are assumed to know what they are doing and provide the necessary bracing to stabilize the structure during erection.
Building code administrators should enforce the building code. OSHA should enforce safe construction practices but should not be permitted to meddle in building code matters (in my humble opinion).
Best regards,
BA