1957 Twin Tee Load Tables

[bluefire713]

I'm working on a building constructed in the late 1950's in Denver that's looking to make a modification to the roof structure, which is 6 ft wide, 14" deep untopped precast double tees. We've done some GPR have identified the number/pattern of strands and the layout of the flange reinforcing, but we're hoping to track down a design table if one exists. Some digging into industry articles and publications led me to George Hanson's article from PCI's "Reflections on the Beginnings of Prestressed Concrete in America: Part 6, Early History of Precast Concrete in Colorado," which states:
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It suggests that Prestressed Concrete of Colorado likely had span or load tables starting circa 1957, and I'm trying to hunt those down, as it's very likely the building was built around or shortly after those were developed. That's also the timeframe that Rocky Mountain Prestress came into being, so if anyone has any load/span tables from them (not sure if those exist) from the late 1950's/early 1960's, I'd be interested in those too.

Also, I am aware that PCI has a 6DT12 in their 1971 load tables. Unfortunately, the dimensions of our in-situ tees don't conform to those tables.

Thanks!

 

[JP Garza]

Hey, I am actually an architecture student here in Denver! I have been studying the history and use of the TWIN TEE® concrete member for over a year now, I am shocked I came across this inquiry here. I have the EXACT load tables from 1957 you are looking for, they are much less detailed than the stuff PCI publishes now days though.

I am always looking for more material for my research, how would you feel about a trade for information regarding your building, there's only so much public information I can get my hands on, whatever is appropriate professionally obviously. I have been researching the buildings at 2601 Zuni, 4770 Washington, 18th and Lawrence, and a few others built in that decade.

The file is fairly large, can I email it to you? It's the full magazine, its quite neat.