Recent content by legner

The single-angle spec. starts on page 5-309 of the 9th edition ASD. Have fun! (stick to equal-leg angles for your own sake...)

Our firm often requires submittal of structural calculations for building components such as wood trusses, precast plank, etc. The calculations are specified to be prepared by a licensed structural engineer in the project's state. What we get back varies widely. For example, we have had 20-page...

I believe sometimes they use kilogram as a force by assuming earth's gravity, i.e. 1 kgf = 9.81 N. This is analogous to using pounds for mass rather than slugs.<br>

Thanks for your thoughts, TimC. About the rock anchors, they might make the building official feel better, but I'm wondering about their real ability to restrain frost. It's hard to come by a numerical value for frost heave, but Joseph Bowles gives a value of around 40,000 psf. That would be...

Do spread footing foundations which bear directly on bedrock (unweathered) need to be extended down to frost depth? Specifically, we have a case where bedrock is, say 24&quot; below grade, and minimum frost depth of 42&quot; below grade. Is it necessary to excavate the rock to achieve the 42&quot;?

Actually, you want to order cubic yards.<br><br>(4/12 * 14 * 30)/27 = 5.2 cubic yards. You'll want to order a little extra; ask your ready-mix plant how much over they would recommend.<br><br>

I'm talking about a single wythe of brick (3 5/8&quot;) with a loose steel lintel. A double angle would not fit.

Ron:<br><br>That much is clear, but have you tried to write a specification based on ACI 305/306? It's not easy. For example, how do you define &quot;hot weather?&quot; Hot weather can mean 75 degrees (with low humidity and a drying wind).

How do you handle hot-weather and cold-weather concreting requirements in your CD's? ACI 305R and 306R explicitly indicate they <b>cannot</b> be directly incorporated into project specifications.

I am wondering how others design single-angle loose lintels:<br><br>1. Use BIA tables?<br><br>2. Design for l/600 deflection and check fb&lt;=0.6Fy?<br><br>3. Design per single-angle specification, accounting for eccentricity of load, torsion, tip deflection due to torsional rotation, etc?<br>&nbsp;

Bussh is right: go buy Ringo & Anderson. We have this book and it is great. It covers many methods, including PCA, WRI, Army COE, etc. I didn't know others knew about this gem.

See also PCI Design Handbook, 4th Edition, section 9.7 Vibration in Concrete Structures. It provides a hand-grenade method and a list of 11 references.<br>

In the US, what part of the building code related to concrete design was written by lawmakers and bureaucrats? Design loads are based on ASCE 7 - a society of engineers. Concrete design is based on ACI 318, the committee for which is composed of practicing engineers and engineering academia...

I was just wondering if anyone had thoughts on the ergonomics standards that OSHA is proposing:<br> <br> <A HREF="http://www.osha-slc.gov/ergonomics-standard/index.html" TARGET="_new">http://www.osha-slc.gov/ergonomics-standard/index.html</A><br> <br> How would they affect construction? or even...

We typically design grade beams without considering any soil support. However, what you are talking about sounds more like a continuous footing with unusual end supports. I would recommend designing it as a beam on elastic foundation, either by the classical formulas while ignoring the end...