Dimensioning bolted connections
Dimensioning bolted connections
(OP)
Regarding bolted connections, do you:
A. Use a standard dimension (2-1/2" or 3") from top flange to the first bolt.
B. Center the bolt group on the beam web.
The example would be a shear tab or a clip angle connection.
My fabrication experience (large industrial shop) preferred "A". We used standard distances for W8 (2-1/2") and W12+ (3"), which I believe was derived from rolling tolerances, k distance, etc. There were a few projects where "B" was used but "A" was pretty standard. I acknowledge "A" will impose a slight eccentricity on the forces since the bolt group is not centered on the beam.
Is there any reference standard to use one or the other? My blue book only lists the standard pitch between bolts. I'm wondering what convention y'all use because my local fabricator won't answer the phone (
)...
A. Use a standard dimension (2-1/2" or 3") from top flange to the first bolt.
B. Center the bolt group on the beam web.
The example would be a shear tab or a clip angle connection.
My fabrication experience (large industrial shop) preferred "A". We used standard distances for W8 (2-1/2") and W12+ (3"), which I believe was derived from rolling tolerances, k distance, etc. There were a few projects where "B" was used but "A" was pretty standard. I acknowledge "A" will impose a slight eccentricity on the forces since the bolt group is not centered on the beam.
Is there any reference standard to use one or the other? My blue book only lists the standard pitch between bolts. I'm wondering what convention y'all use because my local fabricator won't answer the phone (

RE: Dimensioning bolted connections
Well…, you have to physically get the drilling or punching equipment in there to make the web hole; some nominal size washer has to clear the flg./web radius, the “k” value, but I have clipped the o.d. on some washers to make them fit in special situations; the steel manuals used to show a g1 value, as in your method A.; and finally you have to be able to get wrenches in there for erection. We are often most interested in the relative top of stl. elevs. The biggest reason probably pertains to layout and detailing, where we have std. starting surface, and today’s shop equip. just presses the top surface up against a stop (ref. point) and goes from there. The web center is kinda a nebulous location for the shop layout guys. Get out your calipers and micrometers and tell them where the center line is.
RE: Dimensioning bolted connections
RE: Dimensioning bolted connections
RE: Dimensioning bolted connections