Re: 1325-1341 Boylston St (Fenway Triangle/Former Goodyear Tire)
Steel is fine for parking garages, especially if they are protected from the weather underground. Believe it or not, parking structures are built for less load than office or residential space. Cars are heavy, but they also take up a lot of room (something we've heard urbanists complain about. If you had a bunch of people stand in a parking stall, they would actually weigh more than a car would. Parking garages also don't have to worry about heavy truck traffic.
Parking garage live loads are typically taken as only 40 pounds per square foot, versus 50psf for office space.
ASCE 7-10 Minimum Design Loads for Buildings and Other Structures is a handy guide for...exactly what it says.
Pricey though.
http://www.standardsbox.com/asce-7102010-p-970.html
http://www.asce.org/Product.aspx?id=2147487569
Back to the issue of concrete vs steel, it would be easiest to just make it match whatever the building above will be made out of.
Just a hunch, but I think since they're doing a 3-floor, 500-space underground parking garage, they may use reinforced concrete below grade to carry the loads of all those vehicles. If that's the case, then it could be a while before we see steel above ground. I don't have any information that they wouldn't be using steel for the garage, but my educated guess is they'd go with concrete based on experiences in other garages around the neighborhood (Trilogy, 1330, etc.).
Any civil/structural engineers care to chime in?
Steel is fine for parking garages, especially if they are protected from the weather underground. Believe it or not, parking structures are built for less load than office or residential space. Cars are heavy, but they also take up a lot of room (something we've heard urbanists complain about. If you had a bunch of people stand in a parking stall, they would actually weigh more than a car would. Parking garages also don't have to worry about heavy truck traffic.
Parking garage live loads are typically taken as only 40 pounds per square foot, versus 50psf for office space.
ASCE 7-10 Minimum Design Loads for Buildings and Other Structures is a handy guide for...exactly what it says.
Pricey though.
http://www.standardsbox.com/asce-7102010-p-970.html
http://www.asce.org/Product.aspx?id=2147487569
Back to the issue of concrete vs steel, it would be easiest to just make it match whatever the building above will be made out of.
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