Recent content by JSA

Also, I used the equation and got 530 psi for my application. Back to the drawing board...... Thank you for your responses.

I found this. Section 4.3. http://books.google.com/books?id=4VZZ8XgAqkEC&pg=PT160&lpg=PT160&dq=wood+beam+%22torsional+stress%22&source=web&ots=bFZY8ZAf4U&sig=qsfQns_DtTl5n--iKxihwSpj4CQ&hl=en#PPT160,M1

Does anyone have a reference for designing a wood beam for torsion. I took a quick look in Breyer's book and didn't see anything.

Mjohan, I have never heard of cutting joints and have never required it for structural [elevated] slabs. I believe this is because most elevated slabs have plenty of reinforcing and pours are limited typically to 20,000 sf and 500 yards, as a function of what can be done in a day. Regarding...

HochwaltPE, As promised, I have some actual results. The shoring (middle support) was pulled after 30 days and the deflection was only 1/16 to 1/8". This surprised me; I thought it would be more. It seems that the enormous cross-sectional area of steel more than compensated for the...

Thanks for your input. I think I will camber it about an inch. I'll let you know what happens.

I'm trying to decide if I should camber the system. Neglecting any effects from the precompression noted above, my calculations show deflections for the 20-foot span to be anywhere from 0.25" slab-only dead to 2" long-term dead plus live. My gut tells me to camber this 20-foot...

I'm trying to compute the deflection of concrete-filled metal floor deck, two-span condition after the center support is removed. The one-way slab is 3" deck with 6" concrete fill over the flutes for 9" total thickness. There are two 10-foot spans and the deck is continuous over...

In concrete buildings, the stair and elevator cores are often used for shearwalls. Also, there are often duct shafts that are a part of the use of the core too. This leads to concrete shearwalls with many openings. For the purpose of this question, consider a shearwall, one story...

In my limited experience, adding mass is the most efficient way to reduce vibrations.

lindsbm, It's a very good question that you ask. It is difficult to visualize this. Let me tell you my way of understanding. I'm going to assume that you will utilize simple shear plate connections, which are the cheapest. Engineer's loosely assume these connections are pinned. In...

JAE - My conclusion was that for a "normal" file cabinet room (file cabinets with a maximum height of 6'-7" & lateral files - worst case from my study) you would not need any more floor live load capacity than 80 psf, unreduced. For new office construction, considering that...

Thank you all for your input. Your responses have inspired me to go ahead and get some useful numbers. I weighed my own filing cabinet (which is filled to the gunwhales) by tilting it onto a bathroom scale. I got 230 lbs, or 23 pcf, or 100 psf. Then I went to Office Depot and measured file...

I have been getting questions from clients lately asking about potential tenants who want storage rooms full of filing cabinets. I'm talking about the standard ones that must be about 4 to 5-feet-high ... and I'm guessing 15" x 30", arranged for efficient use of the room as a file...

Does anyone know AutoCAD's plans for the .NET framework? Seems to me that AutoCAD will have to support VB.NET (as opposed to C# or ?). Anyone with any info on this?