If the engineer who sealed project drawings is no longer employed with the company, and drawing revisions are made that require re-stamping, is it required that the original engineer (EOR) stamp the revisions or can another engineer stamp?
1/2" is generally where the wheels are on the bottom flange.
Look up the hoist or trolley you intend to use....information is numerous places on the web.
I think this type of weld/connection is specifically prohibited by AISC. Similar to the idea that one should never use a single sided fillet weld on a plate that is in tension.
It is also worth noting that the minimum tensile strength, Fu, of A325 and F1852 bolts is 120 ksi.
The value of 90 ksi found in the Specification is based a 0.75 factor used to account for the reduction in area for the threaded portion of the fastener.
It is worth downloading the RCSC for a read as well as AISC Design Guide 17 on High Strength Bolts.
Some of it can be a bit counter intuitive (as I have displayed by posting incorrect information).
I think the idea with pretensioning of bolts is that you can stretch the bolt past the...
Actually, I believe this statement I made is incorrect:
"To answer your question more directly, preloading the bolt to 70% of Fu ensures that the bolt is stretched elastically, but not yielded"
I believe it actually ensures that the bolt is in fact yielded.
Pretension values in Table 3.1 are based on 70% of the minimum tensile strength of the bolt (Fu) which in this case is 90 ksi. The nominal area of a 3/4" bolt is 0.44 in2
So the min bolt pretension is 0.44 in2 x 90 ksi x 0.70 = 27.8kips.
The available strength in tension is 0.44 in2 x 90 ksi...
An animation + a video of the actual collapse in case no one has posted it.
http://www.huffingtonpost.ca/2013/03/21/elliot-lake-mall-collapse-video-algo-centre_n_2927511.html
I always prefer leveling plates.
When done properly and set using the proper equipment the leveling plates can be set & grouted prior to the columns even showing up on site.
You can even place center/column line marks on the leveling plate ahead of time to match up with the columns.
If all is...
After reading through this again, I agree with others...no way you can use a 1/4" setting plate with a lug welded to it. I am pretty certain that when you check the rupture strength of the 1/4" setting plate welds to the HSS you're going to have issues.
