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Proportioning Reinforcement for Buried Concrete Pipe

by Frank J. Heger, Simpson Gumpertz & Heger Inc, Arlington, MA, USA,



Document Type: Proceeding Paper

Part of: Advances in Underground Pipeline Engineering

Abstract:

The proportioning of reinforcement between inner and outer cages that is specified in ASTM Standard Specification C76 for concrete pipe in sewer and culvert applications is examined in the light of the results obtained with SPIDA, a new soil-structure interaction analysis and design computer program. These analyses, as well as other more conventional analyses for buried pipe, show that the amount of reinforcement required in the outside cage of ASTM standard designs for double cage reinforcement arrangements is excessive relative to the reinforcement provided for the inside cage. The principal conclusion from this study is that a reduction in the required ratio of outside reinforcement area from 0. 75 to 0. 60 will not reduce strength or serviceability (crack control) of pipe in the buried state. When this finding is put into effect in the ASTM C76 Pipe Specification, the total circumferential reinforcement required for standard pipe is reduced by 8-1/2 percent with no loss in pipe strength or serviceability.

Subject Headings: Concrete pipes | Buried pipes | Reinforced concrete | Soil-pipe interaction | Soil stabilization | Computer analysis | Soil analysis

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