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So basically what I am doing is I have this existing building that was grossly overdesigned in anticipation of heavy mechanical loading and roof garden areas that were never placed and now they are considering possibly placing a helipad instead... They want to know if its possible to do without...

Didn't even know you could do that... I'll be using that more in the future instead of just posting first. Sorry bout that!

Thanks! The 5390-2b.pdf is really useful!

Does anyone know anything regarding this or any references which can guide me as to what I should anticipate for loading from a helipad on a building. I know I should account for the weight of the helicopter, but also I imagine there should be both upward and downward wind forces plus some...

Dave, I understand that the maximum designates the largest opening, but what dimension is used as the clear height? Is it the dimension from the top of the window to the bottom of the window or is it the dimension from the top of the window to the sill plate? Using 0.6*DL makes sense to me...

Can someone please help clear up some of the grey areas I have about this section??? 1. "The maximum opening height shall be taken as the maximum opening clear height." Say I have a 5' window that is 3' off the sill plate. I first took this to mean that the opening height is from the top of...

Thank you! I looked at the Breyer text and it seems pretty straightforward now.

I was going through all the factors that you can apply to allowable lateral design values for single shear connections and noticed the Diaphragm Factor, Cdi. I've never used this factor before and thought I'd take a look into it, but now I'm slightly confused. Table 10.3.1 on page 58 of the...

We support wood with steel. Why not support steel with wood? As long as the supporting member can resist the loads there shouldn't be a problem. Usually, I see steel used in residential projects for clearance issues anyway so its not really because of a super high load... just to minimize...

This is a lot to read and may be slightly confusing... I apologize beforehand, but thank you for any help you may provide. I'm trying to design a chart giving required embedments for 1.66" outside diameter piles supporting light weight residential tramways in Michigan. I want to calculate the...

Ok... so to answer some questions. - The diaphragm is wood and therefore flexible. - The walls are wood 2x6 construction. - All exterior walls are pretty much taken up by door and window openings. love this :) - I've provided shearwalls at the steps in the building (i.e a.5, b, b.5, c, c.5)...

I'm doing a project where I've got a diaphragm as shown in the image... I am wondering if anyone knows of any study to find a spread angle for loading in wood sheathed diaphragm. My diaphragm is 19/32" shtg with 10d nails @ 6" o.c. edge, 12" o.c. field. My thoughts are that the diaphragm...

Thanks all for your help!

If the pipe is galvanized, would this negate any bond from forming? FYI: I'm now planning on providing positive resistance via a threaded rod or bolt located in the concrete pour zone.

Four answers for your questions: :) 1. Aren't you concerned with the unencased pipe rusting out below grade? How long would you anticipate before rusting would become a structural issue? I'm a rather new engineer, but I would anticipate that the duration of time would be greater than the...

I have a 1.25" sched 40 pipe embedded into the ground 6'-0" and a 12" diameter concrete collar poured around it at the surface (12" deep)... I'm trying to figure out what the bond strength is between the steel pipe and the concrete for vertical force resistance. My concern is that the...