Axial Capacity of Reinforced Gasketed Joints

Anonymous — Wed, 30 Sep 2020 06:00:00 +0000

Axial Capacity of Reinforced Gasketed Joints Anonymous (not verified) Wed, 09/30/2020 - 00:00 Projects Full Scale Testing Lifeline Systems PVC Pipe Pipeline Systems Reports Research Structures

Full Project Title: Axial Capacity of C900 PVC Pipe with Reinforced Gasketed Joints

Year: 2019-20

Industry Partner: Denver Water

CIEST Personnel: Jessica Ramos, John Hindman, Brice Lucero, David Ballcells, Hayley Parnell, and Porter Hawkins

Primary Investigator: Prof. Brad Wham

Summary: The objective of this study was to impose externally applied axial loading to reinforced gasketed water pipeline joints to establish upper bound performance under worst case conditions of ground movement. Test protocols included axial tension and cyclic (progressive tension and compression) loading on bell-spigot style C900 PVC pipe to simulate deformations possible during natural hazards such as earthquakes and landslides . The test specimens consisted of either RieberLok Gasketed or Diamond Lok-21 pipe with a restraining ring. Tests provided measures of axial displacement capacity, pipeline connection strength, and failure mechanism. The results indicated these systems as potentially viable solutions for regions prone to persistent soil movement and settlement. Tests were conducted in partnership with Denver Water.

Failed specimen after testing in tension.

View the full report here.

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Evaluation of Hazard-Resistant Pipelines

Anonymous — Fri, 27 Sep 2019 06:00:00 +0000

Evaluation of Hazard-Resistant Pipelines Anonymous (not verified) Fri, 09/27/2019 - 00:00 Projects Lifeline Systems PVC Pipe Pipeline Systems Reports Research Structures

Full Project Title: Seismic Evaluation of Hazard-Resistant Pipelines: Axial Testing of PVC, PVCO, and iPVC Pipe with Coupling

Year: 2019

Industry Partners: East Bay Municipal Utility Department (EBMUD)

CIEST Personnel: Cory Ihnotic, David Kyle Anderson, Jessica Ramos, David Balcells, Brice Lucero, John Hindman, and co.

Primary Investigator: Prof. Brad Wham

Summary: The first in a series of testing programs at CU Boulder CIEST investigating performance of critical lifeline systems under extreme loading conditions. This study focuses on the response of various thermoplastic pipe materials and a coupling connection under externally applied axial and lateral loading. Internally pressurized, 6 in. (150 mm) diameter specimens were tested to failure under various loading scenarios including axial tension, compression, and cyclic loading as well as transverse 4-pt bending. This project initiated the development of self-reacting test frame capable of applying dynamic tension and/or compressive loading in excess of 100,000 lbs (445 kN) to linear structures up to 12 ft (3.66 m) long. CIEST’s 1,000,000 lb (4450 kN) four-post load frame was employed to apply lateral loading.

View the full report

Appreciation is extended to collaborators David Katzev and Timothy Harris of EBMUD for their intellectual and practical contributions to the project.

The first in a series of testing programs at CU Boulder CIEST investigating performance of critical lifeline systems under extreme loading conditions.

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