Recent content by dpa

Hi all, A client has a home on the banks of a river in Washington State. During flood conditions the bank undergoes scouring. The bottom of the scoured area is 3 feet above the current water lever and goes up another 2 feet with a horizontal dimension of 18 to 20 inches. The supports for the...

Contact the National Frame Builders Association www.postframe.org (800) 557-6957. Get the Post Frame Building Design Manual. There are several pages of test data in there for metal diaphragms that were actually constructed and tested in a lab. The book was pricey as I recall but worth it...

Thanks IRstuff. That's a great tip especially since the NDS uses that notation. DPA

Thanks aggman and Mr Mikee. I like your answer. I don't think I will mess with modified stiffness again. With a spreadsheet a few more iterations amounts to nothing anyway you can copy and paste to get them. DPA

I am not restraining the end of the cantilever. I am simply treating the connection at the supports as pinned. Like I think I said before it is a continuous beam with three spans and two overhangs. The modified stiffness is from Elementary Theory of Structures" by Yuan-Yu Hsieh. It was used...

Are these actually barges as your title says? If so structural is the least of your worries. Ships and barges carrying liquids must be carefully designed for stability. Swash plates may need to be installed to prevent liquids from moving too much. Visualize carrying a roaster pan full of...

I use Mathcad (plus Excel for moment distribution). I always paste any spreadsheets plus AutoCad sketches in the mathcad documents. Then I narrate the heck out of it. Partly it helps get the approvals faster but mostly I do it so that if someone asks a question a few months down the road it...

I have a three span beam with two-three foot overhangs. I treated the ends with the overhangs as pinned and did one moment distribution using modified stiffness (0.75*stiffenss) at the pinned ends and one without modified stiffness. They both converge to within two decimal places (using Excel)...

Hi RWF7437, I printed this thread out back when it was new. I am about to send some info to a mining engineer in Canada about max pressures. In that thread, which he started, some engineers expressed the opinion that pressures never even get up to full hydrostatic. I disagree and so...

Not yet. Just in the proposal stage DPA

Kivi, It's a fairly large format book so I don't know if I can get that page to fit on my scanner. I'll give it a try. This seems to be the only source that propounds loads that high but if they are right a lot of retaining walls could be in trouble. DPA

Hi RCEJD, Thanks I'll check them out. DPA

Hi all, This is not a question it is a solution to a problem I have had for quite some time. I hope it helps. When importing AutoCad drawings into Mathcad The lineweight would either be so fine it would not reproduce well or it would be so heavy that things became unreadable. I...

I am looking for advice or references to determine the number and depth of soil nails on a slope of 45 to 55 degrees. The soil is fine grained sand with just enough silt to cause it to form lumps that can be broken by hand when dug. Thanks, DPA

I am looking for information to help determine the quantity, spacing and depth of soil nails. The site is a steep slope about 45 to 55 degrees and about 150 feet high. Soil is fine sand with just enough silt to form solid but easily broken lumps when dug with a shovel. Lab tests will be...