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I believe we're getting a little off track. I don't want a redesign, I want to quantify what we're doing. Does anyone know of a reference that gives values for across the grain shear? I recently read an article on a website, where some guy is designing an ark, like Noah's, that stated across...

I'm interpreting, "simply supported prismatic member," to mean rafters. For these the unbalanced snow load is Ipg; no ps or Cs involved. For all others you can use a reduced snowload on the windward and leeward sides of the roof as each side includes ps in its calculation, but then the surcharge...

In ASCE 7-05 the Roof Slope Factor Cs provides for a slippery roof surface (fig. 7-2), which can greatly reduce the snow load. But, when calculating unbalanced roof loads the roof surface does not come into play, and because the worst case is used to design structure, this effectively negates...

I believe, with a cable, if you have 9100# on one end you have to have 9100# on the other end, disregarding friction and other forces associated with bending around the corner of the box (let's not make this anymore complicated than we have to). We already use this system for lifting mods, and...

There was supposed to be a second jpg with my last post. I've resubmitted it here. I'm new to these forums, can you only link to one file per post?http://files.engineering.com/getfile.aspx?folder=c4822d5e-7835-4cd8-9723-4051a643b9e5&file=Lifting_Mod.jpg

I've attached a couple of jpg files to illustrate the lifting configuration. The cable goes across the bottom of the mod and out the other side. There are spreaders above the mods to keep the cable away from the...

I work for a modular builder and we set the mods in place by lifting them with a cable that is 1/2 or 5/8 inch in diameter. The cable is threaded thru a hole drilled in the rim joists at the bottom of the mod. The rim joists are 2 plies of 2x12 SPF #1/#2. I've been charged with determining if we...

ssweetland, Thanks for your reply. Are you familiar with 780CMR? My thinking is that hn is to the highest connection of the vertical elements of the seismic resisting system to the diaphragms that comprise and transmit the inertial loads to those vertical elements. A lot of 780CMR looks like...

We build mostly R1 and R2 for the New England area and therefore aren't usually concerned about seismic calculations, but now I have a Daycare center going into Massachusetts. I'm trying to correlate the Mass. 780CMR code values with those obtained from ASCE 7-05. My question: in ASCE 7-05...

I was browsing through the threads and came across a warning, and ensuing discussion (thread404-157296), on whether Excel should calculate the expression -5^2 as equal to 25 or -25. If you use the Excel function Power(number,power) then there is no ambiguity. If you want to square -5 then you...