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Interesting. You're right, the commentary says 25psf. I wonder which governs? 40 psf doesn't make sense to me in some cases... For instance, if the equipment is sitting directly on the roof, you could use the minimum roof live load to cover the load from maintenance personnel. In many cases...

Actually, ASCE 7 now says 40 PSF for catwalks. Which still seems high if applied to the entire catwalk surrounding a large piece of equipment. -JCali

When providing a maintenance platform for a rooftop HVAC unit, what is the proper live load for this platform? The platform that I have in mind would be a steel frame supported by posts a couple feet above the roof with an open grating walking surface(In this case it would be added to an...

We have lots of old joist catalogs in our office. We probably have the info you're looking for. Let me know how to get the info to you, and I can send you scanned pages. JCali.

I'm looking for an AISC HSS Connections Manual. It's no longer available from AISC (I checked the website and called AISC). Any ideas where I can get this? -JCali

Thank you all. I appreciate your comments and insight. -JCali

Hello, Do any of you have experience using radiant heat cables or other means of eliminating snow drift loading on an existing building roof? Does it work? Do Codes allow this? Any links to websites? I'd like to use this type of solution, if possible, to avoid extensive joist and deck...

Hello, I'm working on design of 5 unheated T-hangar buildings with a total of 49 hangar spaces. International Building Code says we need a floor drain in each space. Past practice has been that drains aren't required in "storage" hangars, only in open bay multi-plane "maintenance" hangars...

What are the design loads for a fence? I'm designing a 10 ft high ornamental aluminum fence with vertical aluminum bar pickets spaced at 4" oc. What would be the design load to design a vertical picket spanning approximately 10 ft from top to bottom rail? -JCali

Thanks! So, what table would you use to design the bottom slab? I could see using figure 34 for steel at corner, but what figure would you use for top steel away from the corner? -JCali

I'm designing an open-top rectangular concrete tank. The walls are fixed to a base slab and free at the top. I determined fixed end moments of the wall and slab using "Moody Tables". Now I want to perform a moment distribution to determine the final moment at the base slab/wall interface...

The caps are already in place.

I'm a structural engineer working on a one story pre-cast concrete parking deck project supported by H-piles. Now that construction of the foundations is nearly complete, we've been asked if another level can be added (Until this point we had been specifically directed NOT to design for...

apsix, You're right. All constructive input is welcome. I'm sorry. -JCali

Constructive input to the question is appreciated. Preaching the obvious is not necessary. -JCali

That's the part that puzzles me the most. I was hoping that others in the Eng-tips universe had heard of this and could tell me why. -JCali

Lower cost isn't good if you're compromising the structure. The idea of building masonry tight to structural steel doesn't sound right, whether it costs less or not. -JCali

This pertains to low, multi-story building design (4 stories, steel frame with exterior masonry walls). Through a colleague, I heard that structural engineers in a large northeastern metropolitan area are designing very rigid primary structures in order to avoid as much "secondary" framing as...

In the context of construction specifications, I've seen different definitions for the terms Quality Control and Quality Assurance. AIA Masterspec defines Quality Assurance as "Activities...performed before and during execution of work" and Quality Control as "Tests, Inspections...during and...

Hello, I'm looking for Guide Specification language to incorporate IBC Special Inspections into our project specs (for Earthwork, Steel, Concrete, Masonry, etc.) Are there any references out there? -JCali