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Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

  • 1.  Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-21-2018 12:48 PM
    Edited by Tirza Austin 12-21-2018 12:47 PM
    I'm currently working on designing a temporary stream crossing for a construction project in Southern California. The crossing is currently planned to consist of multiple corrugated metal pipes (CMPs) installed in one layer, at the same elevation across the width of the stream channel, with a TBD spacing between each pipe. Based on the hydraulic analysis I performed, a total of eight (8) 36" diameter CMPs will adequately accommodate the design flow and rip rap will be placed at the entrance and outfall (wall thickness of the pipe is TBD). The portion of design I'm struggling with pertains to verifying the structural adequacy of the CMPs because most reference publications seem to focus on highway design loads (e.g. AASHTO HL-93, HS-20, etc.) but the design load for this project is a piece of heavy equipment on tracks with an operating weight of nearly 500,000 lbs. The tracks are each 3 feet wide with 20 feet of soil contact length on the ground. AASHTO's LRFD Bridge Design Manual and the National Corrugated Steel Pipe Association (NCSPA) Design Manual both provide guidance on design for a single pipe but contain little, if any, guidance on load analysis for multiple pipes for non-highway loads. These design manuals do provide information on general spacing of a multiple pipe configuration but this seems to apply to highway load conditions only. Does anyone know where I can find structural design criteria for multiple CMPs with a special loading criteria as previously outlined?

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    Mark Berns P.E., M.ASCE
    San Francisco CA
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  • 2.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-22-2018 09:47 AM
    Edited by Tirza Austin 12-22-2018 09:47 AM
    I don't have any reference but one approach would be to determine equivalent depth of soil cover for the pressure under the tracks. For 120 PCF unit soil weight and if my math is correct this works out to be 34.7 ft.

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    David Kennicutt P.E., M.ASCE
    SR PROJECT MNGR
    Delta Engineers, Architects & L.S., P.C.
    Endwell NY
    (607) 648-9341
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  • 3.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-24-2018 08:37 AM
    Edited by Tirza Austin 12-24-2018 08:36 AM
    Try Contech Engineered Solutions  https://www.conteches.com  They are national in scope so there should be an office near you.  Yes, they are sales folks, but they have specific engineering solutions for corrugated metal pipe and great reference material.  I used them when I was working.

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    James Justin Mercier, P.E.
    Life Member ASCE
    Sr. Life Member IEEE
    Austin Texas
    512-442-4016
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  • 4.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-26-2018 12:01 PM
    Edited by Tirza Austin 12-26-2018 12:00 PM

    Suggest checking the American Railway Engineering and Maintenance-of-Way Association (AREMA) Manual for Railway Engineering to see if it provides any guidance.  



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    Donald Stursma P.E., M.ASCE
    Manager
    Pella IA
    (641)621-1613
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  • 5.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)
    Best Answer

    Posted 12-26-2018 12:59 PM
    Edited by Mark Berns 01-09-2019 04:24 PM
    ​Try to model the problem with CANDE-2017 software (Culvert Analysis and Design software). It's a free finite element program developed by Professor Michael Katona under National Cooperative Highway Research Program NCHRP 15-28. Google it under CANDE-2017 to find the website to download it.

    Regards

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    Armando De La Rocha P.E., M.ASCE
    SR GEOTECH ENGR
    Western Technologies Inc
    Phoenix AZ
    (480) 753-0818
    ------------------------------



  • 6.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-27-2018 03:25 PM
    Edited by Tirza Austin 12-27-2018 03:24 PM
    ​Hello Mark,

    I recently had a situtation where I had to evaluate the structural capacity of an old CMP sewer line. The National Corrugated Steel Pipe Association has a design manual that helped me perform this task. From my reading of it, it seems a lot of the capacity comes from the surrounding soil arching to shed the load. It will be important to have the soil compacted well to ensure the load sheds properly. The portion of the load that goes into the pipe is evaulated as a compression stress on the pipe. The pipe is evaluated as a compression ring. There are also tables that give you the minimum cover based on typical HS loadings and Cooper E80 loadings. You can get the manual on Download The Corrugated Steel Pipe Design Manual
    NCSPA remove preview
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    Hope this helps.

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    Adefolahan Odunlade P.E., A.M.ASCE
    Project Manager
    Washington DC
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  • 7.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-28-2018 02:01 PM
    Edited by Tirza Austin 12-28-2018 02:01 PM
    You have already received some good advice regarding design.  With CMP it is all about backfill and the compaction thereof.  Considering the loading that you are working with I would insist on a Materials Testing Tech on site at all times during construction.  You might want to consider specifying high quality flowable fill with about 30% air at least up to the spring line of the pipe to make sure the material is well consolidated under the haunches.  If you do use flowable fill make sure the pipes are sufficiently well anchored that they don't float.

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    James Anderson, MASCE
    Principal
    Anderson Consulting
    North Richland Hills, TX
    817-946-9943
    James
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  • 8.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-29-2018 10:34 AM
    Edited by Tirza Austin 12-29-2018 10:34 AM
    The above, and if you space the pipes at least the minimum distance apart, it should not matter that it is a battery of pipes rather than a single pipe.

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    Hans H. Coucheron-Aamot
    [Retired]
    Albuquerque NM
    (505) 897-2554
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  • 9.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 12-30-2018 11:06 AM
    Edited by Tirza Austin 12-30-2018 11:05 AM
    Based on what I saw in the different discussion, the infrastructure (especially the pipeline projects) are useful to the USA economically. For example, the oil line gas project is very good for California and San Diego because It helps to make the metal pipes for extending it, but it should be clean for the environment and strong to resist any weather circumstances based on that various pipe coatings and materials are available to accommodate site-specific needs: aluminized steel type 2 (ALT2), galvanized, CORLIX® Aluminum, and polymeric. 

    CMP Stormwater Detention and Infiltration
    Conteches remove preview
    CMP Stormwater Detention and Infiltration
    Contech's stormwater CMP detention/infiltration systems are customizable, available in multiple material choices, and available in 12" -144" diameters.
    View this on Conteches >



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    Firas Fadil A.M.ASCE
    SDSU
    El Cajon CA
    (619)219-9203
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  • 10.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 01-01-2019 09:29 AM
    Edited by Tirza Austin 01-01-2019 09:28 AM
    Mark, 

    A lot of great comments to support your request!
    My only comment is that you check the equipment specs to verify how the load will spread over the tracks, may not be uniformly distributed over the full area of the tracks; furthermore it is important that the equipment cross over straight so that it does not have to turn when going over the temp crossing, the load distribution may change.

    Good luck and happy 2019.

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    Ramiro Besada Aff.M.ASCE
    Estimating Manager
    Minneapolis MN
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  • 11.  RE: Design of Multiple Barrels of Corrugated Metal Pipe (CMP)

    Posted 01-09-2019 04:41 PM
    Edited by Tirza Austin 01-09-2019 04:40 PM
    All:

    Thanks for the great responses. I believe, I now have all the necessary information to confidently tackle the problem. It was also good to learn about the CANDE-2017 software program. I had not heard of that before but it appears to be a very useful tool for analysis and design or various culvert configurations.

    Regards,

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    Mark Berns P.E., M.ASCE
    San Francisco CA
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