SYMPOSIA PAPER Published: 20 June 2017
STP160120160123

Lap Weld Strength of Reinforced Concrete Pipe Cages

Source

ASTM C76, Standard Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe, and ASTM C1417, Standard Specification for Manufacture of Reinforced Concrete Sewer, Storm Drain, and Culvert Pipe for Direct Design, specify the requirements for reinforced concrete pipe, including the requirements for cage reinforcing welded lap splices. A discrepancy in the pull test requirement for welded lap splices existed between the 2008 versions of both specifications until ASTM C1417-11 was revised to mirror ASTM C76-08. ASTM C76-08 required pull tests of representative specimens to develop at least 50 % of the minimum specified tensile strength (or ultimate strength) of the steel. ASTM C1417-08 specified that pull tests of representative specimens develop no less than 0.9 times (or 90 %) the design yield strength of the circumferential. This discrepancy raised questions when ASTM C1417-08 was revised as to how the required lap splice strength of 90 % of the yield strength was established for ASTM C1417-08 and concern that this might be a more appropriate requirement. Therefore, the concrete pipe industry produced and tested 24-in. and 36-in. diameter pipe in which the welded lap splices did not meet the ASTM C76 requirement of 50 % ultimate strength in order to demonstrate that this requirement does not affect the final three-edge bearing product test results.

Author Information

Hand, George
Oldcastle Precast, Folsom, NJ, US
Schnerch, David
Wiss, Janney, Elstner Associates, Inc., Boston, MA, US
Spahn, Kimberly, L.
American Concrete Pipe Association, Irving, TX, US
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Details
Developed by Committee: C13
Pages: 1–17
DOI: 10.1520/STP160120160123
ISBN-EB: 978-0-8031-7646-1
ISBN-13: 978-0-8031-7645-4