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Why would they use this in the early 1900s if a rolled shape was available? This is a short span runway length. What would've been the reason for using a tri girder riveted runway beam>

Somewhere I saw it was 13/16" is the max hole size for 3/4 but I can't find the reference. Anyways that max hole size for any structural bolt is 1/16" oversized correct?

Pictures are of a 20T runway bearing on a 1914 multi wythe brick wall. Roof has been leaking. Upgrade in 1985 by supporting the center runways with new columns but the runway ends weren't reinforced. We failed the crane inspection.

I'll use the extended end plate for lighter capacity cranes and smaller frames but on the larger frames with higher capacity cranes I prefer the bolted flange seat connection for better rigidity. I'm asked to go out of my comfort range to save money. Curious what others opinions are on the...

Trying to understand the difference and when you'd use one of the other? Designing a frame to support (2) 5T cranes. The frame is 20' high by 55' long. I'm using W12x65 headers and columns. W12x65 is sized based on kl/200 for 55'. I'm used to doing the bolted flange connection but...

I'm designing a crane bridge beam with a coped beam seat for the bridge. I've always used a flat plate as an intermediate flange for the bearing plate. The contractor is asking if they can use two angles as the intermediate flange for the bearing plate with the web of the bridge beam...

Circled in red? Is this standard practice? Located in the states (PA). TIA.

Can't get test weights into the building so I'm doing an engineering study instead.

I've never seen this before and I'm not sure what to say. I'm assuming the Gr8 bolts are inserted into hollow cores and I doubt if sleeve inserts were used. I think the Contractor drilled a hole; squirted epoxy; and stuck the bolt in the hole. What does everyone else think? What you're...

I think the customer but the entire beam and only wanted a short piece and told the supplier to keep the drop. IDK for sure!

To my knowledge, they're drops, left over pieces from a previous order. A customer ordered a specific length but didn't want the drop. So the supplier has these large beams stored incase someone else may need a W14 of this size. edit: Which is stupid, when you buy a beam you're paying for...

The largest column reaction I've seen on plans was 3,000,000 lbs. What's the largest axial reaction you've seen?

Saw these at a steel supplier.

I don't know how to edit my post; but I'm checking web stiffener requirements based on beam rxn's and not wheel loads. Not sure what the unbraced length is for a two-span beam if the top flange is not braced at all. Do the center column act as a brace? I'm guessing no and looking for an...

Thanks for the input. As I figured bolts on the inside of the column is more of a prying issue than anything. Connection is pinned. If it's fixed then I typically do 8 bolts; four on the outside and four on the inside. The capacities are low; 10T and under. Typ is 5T or 3T. Class C. I...

A cap plate with four bolts on the outside of the column OR a cap plate with (4) bolts on the inside of the column? In other words, a cap plate wider than the column with two bolts on each side of the outside of the column OR a cap plate same width as the column with the four bolts on this...

I'm looking for references on which way to install bolts on crane runways. Should the bolt be facing up or down. Installer has the bolts facing up with the logic if the nut comes off the bolt falls out. Also, looking for references saying you should not turn or impact the nut that has a split...

I've used schedule 40, 80, and 120 countless times but I got a request to use schedule 10 or 20. I have the section properties so calculating strength properties isn't an issue assuming it's A53 grade? But can I use it for structural purposes? I need to span a pipe 18' horizontally to support...

Rye=(Lb/1.2PI)*SQRT(Me/ESc). Section 4.9. For a loading that does not cause torsion or lateral bending a more accurate value of rye is determined according to this section. Otherwise revert back to 4.3. Thanks :) I download a trial copy of Digital Canal AL Design and it's computing the same...

Simple beam with a point load in the center. Bending only, no axial. Top flange is in compression.