Buried Culvert Pipe
Buried Culvert Pipe
(OP)
Hi Civil Guys,
I have a question regarding designing a CSP culvert for a haul road.
When I am calculating the allowable buckling pressure I need to include an impact factor for the vehicle which increases the load depending on the burial depth, this would be considered pretty standard I think.
When I am using the Iowa deflection formula to calculate the deflection do I need to consider this impact factor?
Typically in above ground structure, the deflection would be calculated without any impact factor and the ultimate limit state would be designed based on impact factor with load factor or factor of safety as well.
Thanks
I have a question regarding designing a CSP culvert for a haul road.
When I am calculating the allowable buckling pressure I need to include an impact factor for the vehicle which increases the load depending on the burial depth, this would be considered pretty standard I think.
When I am using the Iowa deflection formula to calculate the deflection do I need to consider this impact factor?
Typically in above ground structure, the deflection would be calculated without any impact factor and the ultimate limit state would be designed based on impact factor with load factor or factor of safety as well.
Thanks





RE: Buried Culvert Pipe
Also, may want to see what the National Corrugated Steel Pipe Association has to offer.
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Buried Culvert Pipe
Thanks for this info.
When I look at the heavy equipment items it looks like it is based on a temporary condition. Basically just add a bunch more fill (of whatever type) over your finished grade and then pull it off when complete?
I am looking at final condition where the vehicle will use the road for the next 20-30 years. The fill around the pipe and above the pipe and in the road will all be controlled fill that is placed as we like with 95% SPDD etc. so the filling conditions are the same as under a highway.
The construction equipment section has the same minimum depths for any pipe ranging from 12" to 42", this seems to be a pretty large range for the same fill height!
I am looking to try and have a design based some rational codified approach or simple first principals (like the Iowa) so I can try and learn and understand a little more what is happening with the pipe itself. I think the tables are pretty straight forward for highway or rail vehicles and are based on this type of approach as best I can tell, but I'm not so convinced about the heavy construction equipment section.
RE: Buried Culvert Pipe
RE: Buried Culvert Pipe
http://ascelibrary.org/doi/10.1061/%28ASCE%291090-...
Hell, combine this with planks and you have both suspenders and a belt job there.
Another source.
http://link.springer.com/article/10.1007/s10706-01...
RE: Buried Culvert Pipe
Since you are interested in the details, go to this Link, take a short survey, and download the NCSPA Steel Pipe Design Manual. See Chapter 7, Structural Design (Pages 369-445). The complex information there will probably convince you that using published tables is not a bad way proceed.
www.SlideRuleEra.net
www.VacuumTubeEra.net