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Vehicle Barrier Design

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slickdeals

Structural
Apr 8, 2006
2,266
Greetings,
I have a question pertaining to vehicle barrier design for buildings. IBC requires that these barriers be designed for a load of 6000# acting at a height of 18". What is the width transverse to the load that you assume this load to be distributed? I know AASHTO allows you to assume a 5 foot width transverse to the load. Do you use the same assumption to design the wall and the anchors that support it? I have found no such provision in IBC. How do you design your vehicle barriers?

Thanks
 
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I design them as 4' diameter concrete planters and stagger the spacing so that people can pass through, but vehicles cannot.

Mike McCann
McCann Engineering
 
"I design them as 4' diameter concrete planters "

as in stub columns?
 
I don't think you can take a 5 foot distribution width specified for concrete parapet and barrier walls in AASHTO 2.7.1.3.6. I believe the distribution assumes a truck load near the top of a 32 inches high barrier (See Figure 2.7.4B). It's not stated anywhere, but I believe the 5 foot distribution width assumes a 45 degree spread from the top of the barrier. With a 45 degree distribution, your distribution width is 3 feet.
 
I agree with miecz. The load is assumed to travel at 45 degree angle from the point of impact.
 
I guess I can then design my crash wall as a 3' wide beam resisting the loads?
 
Yes, solid filled stub columns on large spread footings with a planter at the top.

Mike McCann
McCann Engineering
 
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