slab subjected to upwards point load

[ooox]

Hi all,

I'm trying to analyse a slab which is subjected to an upward point load at the edge. The load is about 12kN and the slab 170mm thick spanning 2700mm continuously .

Is there any way which I can determine the area of slab that can be mobilised to resist this load?

 

[Lion06]

Check out this paper.

 

[msquared48]

If it is a sgtructural slab, then the above paper is a good reference.

However, if it is a slab-on-grade, it's a different problem.



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

 

[csd72]

As a rule of thumb we used to use 10 times the thickness of the slab in each direction.

 

[jike]

If the load is at the edge of a structural slab, the normal distribution width will not apply. It may only be approximately 1/2 of the normal distribution width. I would probably use a distribution width of about 25 to 30% of the span. Make sure the slab has adequate distribution steel to spread the load out over that width.

 

[apsix]

The attached details the BS8110 method of concentrated load distribution. This method is also used AS3600, the Aust. concrete code. It results in an effective width of about a metre for that span.

Re a 12 kN upward load on a 170mm slab. This load is equal to 3m2 of slab dead load. Design top reinforcement for the slab cantilevering 1.5m and you should be safe.