Foundation for Bollards
Foundation for Bollards
(OP)
I'm trying to design the foundation/anchorage for pipe bollards under pretty high loads. I'm designing for a 5500# truck at 45 mph (per aviation specs) and an allowance of 30 degree give on the bollard. Assuming crumpling of the truck, I'm looking at a 95,000# horizontal load at 18" above the sidewalk. When I analyze the foundation system, I'm coming up with gigantic footings which will not work on the site. If I look at adding piles, the depth required for the piles is insane. Can anyone offer a little guidance? Is there something I can do to reduce the load? Is there some other method of analysis that will simplify the foundation system?
I also have some bollard that will require a shallow foundation due to underground utilities. These will have a "sled" system that I'm also struggling with. Same loading.
Thanks!
I also have some bollard that will require a shallow foundation due to underground utilities. These will have a "sled" system that I'm also struggling with. Same loading.
Thanks!






RE: Foundation for Bollards
RE: Foundation for Bollards
RE: Foundation for Bollards
The jist of the discussions, though, was that "highway" guardrails, and the associated posts, are generally designed based upon actual field tests of such posts (per AASHTO oversight) and not mathematically.
Angle of impact, velocity, density of the vehicle, crushing characteristics of the vehicle, soil properties, height of impact, etc. are some of the mutlitude of variables that exist and make a definitive calculation very very difficult.
RE: Foundation for Bollards
Another option would be the concrete barriers like they use temporarily or permanently to separate lanes, etc.
It seems like if the foundation was large enough, then including the mass and acceleration of the bollard and foundation could remove a good bit of the loading applied to the soil.
http://www.rsaprotect.com/antiram.php
RE: Foundation for Bollards
RE: Foundation for Bollards
RE: Foundation for Bollards
RE: Foundation for Bollards
Thus, the first row doesn't have to take all the kinetic force by itself. from your description, you don't need to remove the posts or have a "gate" for the bollards.