SRPE AASHTO Specifications July 19 2013 July 19, 2013 www.concrete-pipe.org
Steel Ribbed HDPE 2 = SRHDPE S = SRPE Now has AASHTO Design and Construction Now has AASHTO Design and Construction Specifications for SRPE…. But wait there is more… AASHTO Bridge Design Specs - Section 12 • SRPE AASHTO MP 20-11 • Fiberglass Pipe ASTM D3262 • Corrugated PP AASHTO MP 21 g www.concrete-pipe.org
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6 SRPE Marketing www.concrete-pipe.org
SRPE Marketing 7 Metal Metal + Plastic Plastic = Strength and Durability “Finally a drainage product that is Finally a drainage product that is engineered for service and long life!” Two dissimilar materials utilized in a composite pipe structure will interact p p p with each other once in an installed condition – what will happen??? www.concrete-pipe.org
SRPE Questions 8 Is Local Buckling Equation Applicable? pp www.concrete-pipe.org www.concrete-pipe.org
SRPE Questions 9 What about the steel? f Compressive Bending Stresses - No Stresses - Yes www.concrete-pipe.org www.concrete-pipe.org
10 Design Considerations • Local buckling equation should be L l b kli ti h ld b verified for metal constrained by polyethylene polyethylene • Global buckling equation should be verified for a non uniform verified for a non-uniform steel/polyethylene profile • Bending stresses should be Bending stresses should be considered www.concrete-pipe.org www.concrete-pipe.org
11 Design Issues • Calculations should be reviewed by C l l ti h ld b i d b Engineer to determine that appropriate allowable steel stresses appropriate allowable steel stresses were used. • Fatigue may need to be considered if • Fatigue may need to be considered if under a shallow installation using really high allowable stress levels really high allowable stress levels. www.concrete-pipe.org www.concrete-pipe.org
12 Stress in Polyethylene Stress in Polyethylene www.concrete-pipe.org www.concrete-pipe.org
13 AASHTO Bridge Design Section 12 12.7.2.1 – Section Properties Dimensions and properties of pipe cross- sections; minimum seam strength; mechanical and chemical requirements for aluminum corrugated and steel corrugated pipe and pipe- arch sections; and aluminum and steel corrugated structural plate pipe, pipe-arch, and arch sections, may be taken as given in Appendix A12. Dimensions, properties of pipe cross- sections, and material properties for steel- reinforced thermoplastic culverts shall be provided by the pipe manufacturer. (emphasis added) www.concrete-pipe.org
14 AASHTO Bridge Design Section 12 C12.7.2.1 - commentary Steel-reinforced thermoplastic culverts are pipe sections in which the main load-carrying members are steel ribs encapsulated by thermoplastic material that may brace the ribs from distortion and buckling. This composite system should be evaluated independently for each manufacturer’s pipe system. Designers should obtain the required mechanical properties directly from the pipe manufacturer to determine fill heights. g (emphasis added) www.concrete-pipe.org
15 AASHTO Bridge Design Section 12 www.concrete-pipe.org
16 AASHTO Bridge Design Section 12 C12.7.2.7 - commentary While the steel ribs are the main load carrying member of the culvert, the thermoplastic profile braces the steel ribs from distortion or buckling under load is critical to the pipe performance . The liner also serves to distribute the load between ribs . A structural evaluation of the profile alone is not required. However, an evaluation of the composite system of thermoplastic liner and steel rib is necessary. It is important to assure that the tensile strains within the profile do not exceed the long-term strain capacity for the thermoplastic material used in the construction of the pipe. p p (emphasis added) www.concrete-pipe.org
17 AASHTO Bridge Construction Specs 26.1.1 Description This work shall consist of furnishing, g fabricating, installing, and inspecting metal pipe, structural plate metal pipe, arches pipe arches box structures and arches, pipe arches, box structures, and deep corrugated structures, and steel- reinforced thermoplastic pipe in conformance with these Specifications and the details shown in the contract documents documents. www.concrete-pipe.org
18 AASHTO Bridge Construction Specs 26.3.8.1 General Backfill for metal and steel-reinforced Backfill for metal and steel reinforced thermoplastic culverts shall be granular material, as specified in the contract documents and specifications, and shall d t d ifi ti d h ll be free of organic material, rock fragments larger than 3.0 in. (1.5 in. for fragments larger than 3.0 in. (1.5 in. for steel reinforced thermoplastic pipe) in the greatest dimension, and frozen lumps, and shall have a moisture content within d h ll h i t t t ithi the limits required for compaction. www.concrete-pipe.org
19 AASHTO Bridge Construction Specs 26.3.9—Steel-Reinforced Thermoplastic Culverts Steel-reinforced thermoplastic culverts shall conform to the requirements of AASHTO MP 20 . (emphasis added) AASHTO MP 20-11 has been approved for 12”-60” www.concrete-pipe.org
AASHTO Section 26 Metal - Joints 20 26.4.2.5—Steel Reinforced Thermoplastic Culvert Joints Joints for steel reinforced thermoplastic pipe shall comply with the details shown in the contract drawings and on the approved working drawings. Each joint shall be sealed to prevent infiltration of soil (soiltight), fines (silttight), or water (watertight) as required by the contract documents. Field tests may be required by the Engineer whenever there is a question regarding compliance with the contract requirements. Joints shall be installed so that the connection of pipe sections will form a continuous surface free from irregularities in the flow line from irregularities in the flow line. (emphasis added) www.concrete-pipe.org
AASHTO Section 26 Metal - Joints 21 C26 4 2 5 C26.4.2.5 - commentary t Joint types include bands, bell-and-spigot pipe ends, double-bell couplings, and fusion welded joints. Joints may or may not require gaskets. Other joint types may be used provided that documentation is provided to demonstrate that p the joint meets the project requirements. Joints are often provided as soiltight or watertight Definitions of soiltight and silttight watertight. Definitions of soiltight and silttight are vague. Examples can be found elsewhere in this Section. Watertight joints are normally specified to meet ASTM D3212 Pressure specified to meet ASTM D3212 . Pressure capability of joint shall be based on project requirements. Commonly available pressure capabilities are 2 5 and 10 psi capabilities are 2, 5, and 10 psi. (emphasis added) www.concrete-pipe.org
22 SRPE Marketing Material “Achieves a water tight joint performance that sets it apart from performance that sets it apart from conventional pipe products.” Tested to 15 psi, the steel reinforced Tested to 15 psi, the steel reinforced High Performance (HP) joints greatly exceed ASTM’s 10.8 psi requirement. p q For lower performance applications, 3 psi low head (LH) or soil tight (ST) j i t joints are available. Leak-free il bl L k f ElectroFusion (EF) joints are also an option option. www.concrete-pipe.org
23 SRPE Specification Sheet SRPE Specification Sheet Soil Tight Joints (30” – 96”) shall be plain ended SRPE pipe with Al Aluminized Type 2 (or optional i i d T 2 ( ti l Polymeric coated) CMP coupling bands and elastomeric gaskets bands and elastomeric gaskets. www.concrete-pipe.org
24 SRPE Specification Sheet SRPE Specification Sheet Low Head (LH) Joints (30” – 72”) shall be gasketed, stress-rated high h ll b k t d t t d hi h density polyethylene bell and spigot joints that have been laboratory joints that have been laboratory tested to 3 psi when tested in accordance with ASTM D3212 accordance with ASTM D3212. www.concrete-pipe.org
25 SRPE Specification Sheet SRPE Specification Sheet High Performance (HP) Joints (30” (30” – 72”) shall be gasketed, bell 72”) h ll b k t d b ll and spigot joints where both the bell and spigot are reinforced with steel and spigot are reinforced with steel that is fully encased in stress-rated high density polyethylene and that high density polyethylene and that have been laboratory tested to 15 psi when tested in accordance with p ASTM D3212. www.concrete-pipe.org
26 SRPE Specification Sheet ElectroFusion (EF) Joints (36” – 120”) shall utilize plain ended SRPE pipe welded together utilizing exclusive i ld d t th tili i l i pressure testable ElectroFusion couplers The welded connections couplers. The welded connections provide a true in-field watertight system assured by the pressure testable assured by the pressure testable welded sleeves at each welded connection. The field installed ElectroFusion joints shall remain watertight with a “zero” leakage rate up t to a test pressure of 30 psi. t t f 30 i www.concrete-pipe.org
AASHTO Section 26 Metal 27 www.concrete-pipe.org
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