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.
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...
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...
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...
Hi. I have the Aluminum Design Manual and Al Structures book as references. I'm trying to size AL 6061-T6 AL standard beams.
--------------------------------------------------------------------------------------------------------
S12x17.3
L=16'
Lb=16' (unbraced)
AL 6061-T6
Ftu=38 ksi...
I have a personal Exel spreadsheet that computes the thickness for beam bearing plates and column base plates for the 9th edition. I'm revising my personal spreadsheet for the 13th edition. Per page 14-6 of the 13th edition I am given an updated thickness formula for calculating column base...
The slab is composite so I'm leaning towards two rows of steel studs. But I've never seen this noted like this before. Can anyone confirm this? What does the "V" represent? Thank you.
Is it higher than the published 50 ksi? I had testing perfomed on some older beams in an existing building and I was quite suprised by the yield stress numbers. Steel dated 1880s had a yield stress of 38 ksi and steel dated 1940s had a yeild stress of 53 ksi! That's better than A36 and A992...
I've this 10 ton generator and 10 ton fuel tank on a 15'x25' pad. My primary concern is the torque force from initial startup of this generator on the pad. Are there any resources for designing a slab for this application? TIA.
I've this 10 ton generator and 10 ton fuel tank on a 15'x25' pad. My primary concern is the torque force from initial startup of this generator on the pad. Are there any resources for designing a slab for this application? TIA.
I'm connecting a web plate on each side of a column and I'm using a rod with threaded ends through the column. The fabricator wants to use F1554 GR 36 rod and I can't find any shear or tensile values, other than that it has the same properties as A36 steel. I have values for A325 bolts but how...
I have a 100 year old building with these beautiful 12" diameter cast iron columns with a 1" wall thickness. A test lab cut a coupon and they did a tensile test on these columns and they're no good. Brittle Failure – no necking, no elongation. So has anyone every dealt with these type of...
