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I'm currently working on a parking structure and can't seem to find a definitive maximum vehicle ramp slope. Some places says 16% and even 20%, but I haven't found a specific Code that states this.
The space I have to work with is limited so the ramp slope has become crucial to the project at this point. Id love to hear about any experiences that any of you have had on any parking structure project with this situation.
From 2006 IBC:406.2.5 Ramps. Vehicle ramps shall not be considered as required exits unless pedestrian facilities are provided. Vehicle ramps that are utilized for vertical circulation as well as for parking shall not exceed a slope of 1:15 (6.67 percent).
so that's if you're parking on the ramp .. are you designing basically flat parking with a circular ramp at the end? or split level parking?
I'm designing flat parking levels with an express ramp for vertical circulation only.
Really depends on your local parking code. http://vancouver.ca/engsvcs/parking/enf/pdf/DesignGuide.PDF
check out this webpage of my city's design guidelines. Here we can go up to 15% but you need at least 20' at start and end at a shallower slope to avoid bottoming out the vehicle. As car geometry is the same globally I'd say this rule applies everywhere.
IF this still doesn't meet your objectives the only other solution is the dreaded Car elevator!
seattle is sim to vancouver, w/ transition zones at either end of the max slope area.
I have done 22% before, but it was a very unique circumstance. We needed to get from the street level to the third level parking in one shot. It is possible, it makes the city nervous, and i think it is a bit hazardous as you have very limited visibility of the top of the ramp until you are almost on top of it. As people tend to build up speed to get up it, I would recommend a shallower slope if asked to do it again unless there were no alternatives (such as this case). If the project does require something that steep another suggestion would be valet parking only. Every time i think of gramma and her Lincoln trying to drive up that ramp i cringe.
To clarify.. the city i was in at the time did not have a maximum slope for parking ramps.
Right now I have a 20% straight run with two transitions slopes of 12% at each end.
The structure is to accommodate employees for a Police headquarters, so hopefully no gramma but plenty of Crown Victorias.
you'll want to either make the aprons 10% or split them into 2 pieces.. for a double apron.. 10' at 7% then 10' at 14% for a 20% ramp and the reverse at the top. 8% is close to the maximum i would recommend for an apron unless you can verify you have adequate ground clearance for all vehicles you will accommodate. Not being a public garage will be a benefit. Good luck
I was amazed when I first entered a parking structure in Rio....they
have a crazy light system which lets the traffic move in one direction up or down. You have to wait for the green light.....then you go like hell. The ramp is just wide enough to accomodate an automobile.
Then again if you want your car washed the parking attendant is more than happy to have one of his buddies wash and wax your car while it is in the garage.