Evaluation of Combined Load Tests of Prestressed Concrete Cylinder Pipeby Mehdi S. Zarghamee, Simpson Gumpertz & Heger Inc, United States,
Abstract: Combined load tests of prestressed concrete cylinder pipe, presented by Tremblay in the proceedings of this conference, are analyzed. Data gathered during the tests includes first visible cracking, vertical deflection, strains in concrete, mortar, steel cylinder, and prestressing wire at combined loads. In this paper the test results are analyzed and compared with the corresponding values calculated using an analytical model that accounts for the nonlinear stress-strain relationships of the constituent properties, including tensile softening and cracking of core concrete and coating mortar, and that also accounts for moment redistribution resulting from the changes in the stiffness of sections around the pipe under combined loads. Agreement between the observed and calculated combined loads at first visible core and coating cracks, vertical deflection and wire strain is good to excellent.
Subject Headings: Load tests | Concrete cylinder pipes | Load factors | Pipelines | Prestressing | Concrete pipes | Prestressed concrete | Cracking
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