1 / 23

Reinforced Concrete Pipe

Reinforced Concrete Pipe. Structural Design Overview Jason Kruger CPAM Engineer. RCP strength design. Concrete pipe strength Bedding Factor, B f Fill height Traffic loads. RCP strength design. Pipe Classes Class II – least strong Class III – stronger than Class II

owenseric
Download Presentation

Reinforced Concrete Pipe

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reinforced Concrete Pipe Structural Design Overview Jason Kruger CPAM Engineer

  2. RCP strength design • Concrete pipe strength • Bedding Factor, Bf • Fill height • Traffic loads

  3. RCP strength design • Pipe Classes • Class II – least strong • Class III – stronger than Class II • Class IV – stronger than Class III • Class V - strongest

  4. RCP manufacturing • Prescriptive requirements (C76, M170) • Steel reinforcing cage • Area • Yield strength • Concrete strength • Wall thickness

  5. Three-edge bearing test (3-EB) • 3-EB is a proof test • Obtain piece of pipe from production run • Insert pipe in 3-EB test machine • Load it to pre-determined value • Inspect loaded pipe for compliance

  6. 3-EB Test

  7. Three-edge bearing test (3-EB) • 3-EB history • “Gold Standard” • Since 1930’s • Relates pipe strength to the bedding factor, Bf

  8. Three-edge bearing test (3-EB) • 3-EB test load is dependent on • Pipe class • Inside diameter • Pipe length • Loading condition (D.01 or Dult)

  9. Three-edge bearing test (3-EB) • D-Load • Each pipe class is associated with a specific “D-Load” • Definition: • “The D-Load is the supporting strength of a concrete pipe loaded under three-edge bearing test conditions, expressed in pounds per linear foot per foot of inside diameter”

  10. Three-edge bearing test (3-EB) • D-Load • There are two D-Loads that define the strength of a given concrete pipe

  11. Three-edge bearing test (3-EB) • D-load.01 (or simply D.01) “the maximum three-edge bearing test load supported by a concrete pipe before a crack occurs having a width of .01” measured at close intervals throughout a length of at least one foot, expressed as D-load”

  12. Three-edge bearing test (3-EB) • D-loadult (or simply Dult) “the maximum three-edge bearing test load supported by a concrete pipe, expressed as D-load” NOTE: D.01is the basis for concrete pipe strength design

  13. Three-edge bearing test (3-EB) • D-Loads for each pipe class

  14. Three-edge bearing test (3-EB) • 3-EB test load – SAMPLE CALCULATION • Test pipe: 36”i.d.Class III • Required D.01 = 1,350 • Total 3-EB test load = Pipe i.d.X Length X D.01 = (36/12) X 8 X 1350 = 32,400 lbs

  15. Three-edge bearing test (3-EB) • 3-EB test: passing criteria: • Cracks are no wider than .01” • .01” cracks less than 12” in length are considered passing

  16. ASTM C76 - Tested pipe allowable for project

  17. AASTHO Section 27

  18. State crack specifications assessed

  19. Discussion

More Related