Garge load on floor slab

[benjaman]

Hi,

We are designing a 6 storey residential building with its basement and ground floor to be used as garage/ parking area.

Can anybody please provide me with some guidelines regarding how to apply the imposed/live loads due to vehicles on the slabs.

Thanks in advance.

 

[hokie66]

Just as a uniform live load, usually about 3 kPa, but varies in some codes. If there is the possibility of useage change in the future, it is wise to use a higher load, as lightly loaded parking slabs are not easily converted for other uses.

 

[rscassar]

It will vary depending on the code you are using depending on the building regulators. My last multi-story project included a 2.5kPa (50psf) design load for basement car-parks which had a carpark height clearance of 2.15m (7'). And 12.5kPa (250psf) for the podium slab which did not have any height clearance. This was to allow large trucks access to a loading bay.

To answer your question 50psf typically. 2000lbs concentrated loads (consider this) and 10,000lbs at 18" for a vehicle impact bumper load.

Also look at this thread and consider super-imposed loads from resurfacing or a large point load from a crane.

thread507-276266

Speak to your client as well to determine whether they have any specific requirements for carpark loads. The loads set-out in the codes are minimum loads.

Give consideration to vibrations if you have a podium slab. There is a coffee shop I like to go to on weekends which is located over a basement. Everytime a car goes over the speed humps you can feel the slab below you vibrating. It is a little unnerving a times.

 

[benjaman]

The design would be in accordance with Eurocode.

Eurocode suggests 2.5 kpa uniform load and 10 to 20 KN axle load on a 100mm wide square surface 1.8 m apart.

So i was wondering whether using the 2.5 kpa uniform load alone would be appropriate for design.

Also applying the axle loads on floor slab are not as straight forward as for bridges. Can any body shed some light on how it is done?

 

[msquared48]

I would think there would be an additional isolated point load to apply, plus alternate span loading conditions.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[apsix]

If it's like Australian/British codes it would be either/or; whichever load causes the greatest effect.
Usually the UDL would be critical, unless you have very short span beams/slabs.

 

[rowingengineer]

don't forget you construction loads for worst case design.

An expert is a man who has made all the mistakes which can be made in a very narrow field

 

[rscassar]

What are typical construction loads to assume in design?

 

[rowingengineer]

Depends on the construction type and sequence, number of floors propped ect. Kilpflip I assume your Australian, so AS3610 is the place you would start for a “standard” answer.

An expert is a man who has made all the mistakes which can be made in a very narrow field