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I think the recommendation for 25% comes from ASCE7 Section 4.10- which applies to crane loads in buildings. Realistically, a stopping vehicle, esp. one stopping suddenly, will exert a (small) lateral force into the structure, via the horizontal diaphragm- which will surely distribute it into...

PU, I always ask. I would not have thought of using a composite beam, for example. Truss beams are out because of clearance limitations.

Here is a great thread related to this topic: http://www.eng-tips.com/viewthread.cfm?qid=206015

wannabeSE, I am reading the Vulcraft site right now! Thanks for the excellent reference. Here is the Vulcraft Steel Deck material: http://www.nuconsteel.com/pdf/vulcraft_steel_deck.pdf

PS- not sure how many concrete and steel buildings I've designed, total. But, it is between 500 and 700, I'll estimate. Australia is the last continent on which I've not designed a building.

Thanks, hokie. I have no problem designing things I've never designed before. That is really what engineering is all about. I just wanted to have the formulas, which I located. I read an article saying that there is no engineering for steel pan deck. It said only tables provided by...

Steel PE, It is called "steel deck" in the SDI manual. I finished reading the manual. It is primarily a kind of OSHA document in shipping, site handling, and installation. But, all good reading. Span tables are on sheet 45. Equations are on Sheet 46. No real help in selecting a...

The Steel Deck Institute Manual may help: http://www.sdi.org/whites/moc2.pdf I also have a steel deck question open at the same time, and I found it interesting you have one as well. I'm reading through the manual now. p. 9 of 48 is the first mention of acoustic deck.

I found this reference manual, for any future engineer seeking the same information: http://www.sdi.org/whites/moc2.pdf Still, input from everyone else is appreciated.

I changed from RAM after Bentley bought it to RISA for the reason you stated: I want to change computers sometimes. I have a laptop I can take to my clients' offices and make instant changes, which impresses. Also, I am very much opposed to the "cloud" based idea of ownership. Basically, in...

I am designing a small winery building. It will be 40x80, with an underground storage area. My question is: PAN DECK engineering- how does this work? I have some heavy point loads- moving, loaded, forklift; fermenting vats (near edge of deck) and an estimated 20 tons of grapes each harvest...

You might want to get a history of operations in the wharehouse above. When did the current tanks enter operations? It may be possible that loads greater than the design have entered. Meaning, if the steel beams are deflecting more, this will easily increase stresses in the tension edge of the...

The trusses have failed primarily in two ways: First, the 12" water line dead load actually broke the bottom chord in one truss. The top chord followed. The second, more common damage results from a very slight pitch, looks like 1 in 12 or less (will measure if I get the work). Eventually...

Thanks, Mike. The displacement is at a joint, so that two panels are moving outward at the top of the panels. The maximum is about 8 inches. The walls are 20' high.

I have a package to bid on repairs to wood trusses on three wharehouses. A previous engineer designed repairs to the trusses. I generally like what he did. But, I noted that he did not address a lack of lateral bracing on the trusses. My main concerns are these: 1. One of the buildings has...

sometimes a little cross bracing is more important than you think!

Jim, Thanks for the excellent response. The Reaction number listed under the section "wind columns" lists only this one column, which is nested into a column on one side of the central frame in a three-frame steel building. This wind column is a T-section, a half W beam. The flange is...

The engineer from the NCI confirmed that the moment is calculated from the horizontal shear force. The horizontal and vertical forces in the report do not need to be added.

I phoned them & left a message, as requested. I'll follow up with a post about the structural calculations report.

A wind column, by definition, takes only lateral loads (wind & seismic). So, part of my question pertains to the nature of a wind column. I will call the building manufacturer.