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slab subjected to upwards point load

slab subjected to upwards point load

slab subjected to upwards point load

(OP)
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?

RE: slab subjected to upwards point load

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

RE: slab subjected to upwards point load

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

RE: slab subjected to upwards point load

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.

RE: slab subjected to upwards point load

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.

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