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...
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
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
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...
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...
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
We have a building retrofit project under construction. It consists of 3 levels of new steel floor framing constructed inside an existing masonry shell. The floors are concrete placed on composite metal deck. Concrete placement was completed 2-1/2 months ago in November. Contractor now reports...
Has anyone dealt with exterior painted structural steel tubes that have begun to corrode on the inside? I've been asked about a building in coastal NJ with exposed tube steel stair framing. It's painted outside, but it is corroding from the inside out. Is there any way to repair this?
-JCali
We need wheel configuration and load distribution for a C-5 cargo plane, so we can design a culvert underneath a taxiway. Ideally we need a plan view that shows wheel configuration and load distribution to each wheel group. Need Today! (Sept 15, 2004)
-JCali
I need to specify a structural slab on metal deck. The slab will have an adhered finish that requires a very low moisture content. What can I do to achieve a low moisture content in a timely manner, without waiting months for a curing process? Will a vented deck help?
-JCali
This seems to be a common problem in residential construction. A concrete block basement wall that is cracked horizontally (mid height) and bulging inward, obviously due to lateral earth pressure with inadequate or no wall reinforcement. What is the state-of-the art way of repairing this? I'm...
