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Old 12th April 2010, 02:04 PM   #1
Nigel Lewis
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Default Spread of point load in wall

Hi, I am working out the load on an existing foundation in a bungalow.

I know the weight of the wall and floor etc which are on the foundation but my problem is with the point load from a steel beam which I have designed with Superbeam.

How is the point load dispersed or spread through the wall. For example if the point load is 17.5KN and the wall is 3.6m high from top of concrete to top wall/beam position, what would the loading be for the worst 1m of foundation directly beneath the point load?
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Old 12th April 2010, 06:15 PM   #2
Tony Bryer
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Default Re: Spread of point load in wall

The general rule, assuming that the layout allows it, is to assume that a concentrated load spreads out as a equilateral triangle below the load, so in your case the load ends up being spread over a 3.6m length of foundation. If there are openings or the load is applied near the end of a wall then this assumption will need to be modified accordingly.
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Old 14th April 2010, 08:26 AM   #3
John Cranna
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Default Re: Spread of point load in wall

I have always taken a 45 degree spread from a point load down the wall and thus if the load is 3.6 m up from the footing then it wil spread over a length of 7.2m (3.6 m each side). I would be interested to see if other people go by this or by Tony's principle.

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Old 14th April 2010, 09:10 AM   #4
Tony Bryer
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Default Re: Spread of point load in wall

Yes, on reflection I have assumed 45 degrees in the past. The 60 degree (equilateral triangle) figure comes from Eurocode 6 EN-1996-3 4.3.
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Old 22nd March 2011, 08:18 AM   #5
sadmemories20
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Default Re: Spread of point load in wall

I know the weight of the wall and floor etc which are on the foundation but my problem is with the point load from a steel beam which I have designed with Superbeam.

Last edited by Tony Bryer; 22nd March 2011 at 11:15 AM. Reason: Non-relevant link removed
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Old 22nd March 2011, 11:17 AM   #6
Tony Bryer
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Default Re: Spread of point load in wall

Quote:
Originally Posted by sadmemories20 View Post
I know the weight of the wall and floor etc which are on the foundation but my problem is with the point load from a steel beam which I have designed with Superbeam.
I don't wish to sound unhelpful, but if you are going to use any of our programs for real-life projects you do need to be able to accurately assess the loads on members and understand how these are entered in the program being used.
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