Knowledge Sharing

November 11, 2015

Seismic Strengthening of Buildings in Los Angeles

By: Michael Cochran, Dilip Khatri, Kevin OConnell, Doug Thompson

Los Angeles is no stranger to earthquakes and, like other cities in California, has experienced extensive damage in previous seismic events, which has led to significant advancements in earthquake engineering. Some might say that L.A. has been...

November 5, 2015

Evaluating Snow Loads on Structures

The snow storms that affected the New England region in February of 2015 were, for the most part, typical Nor’...

November 4, 2015

Incorporating GIS-Based Structural Evaluation Tools into Pipeline Asset Management

By: Peter Nardini, Mehdi Zarghamee, Lauren Bain, Courtney Jalbert, Angela Remer
This paper presents the recent enhancements to Tarrant Regional Water District’s (TRWD’s) geographic information system (GIS)-based structural evaluation tool, how this tool is used to improve asset management capabilities,
November 4, 2015

Analysis of a Steel Pipeline in a Seismically Active Region

The Carlsbad Desalination Project uses a pipeline to deliver water from a seawater desalination plant located near sea level to the San Diego County Water Authority’s Second Aqueduct connection facility located at an elevation of
November 4, 2015

Evaluation of Acoustic Wave Based PCCP Stiffness Testing Results

By: Rasko Ojdrovic, Peter Nardini, Marc Bracken, John Marciszewski
Prestressed concrete cylinder pipeline (PCCP) condition assessment methods include an acoustic wave propagation testing technology (ePulse) to identify sections of pipeline with reduced structural stiffness. A recent innovation, ePulse,
November 4, 2015

Composite versus Stand-Alone Design Methodologies for Carbon Fiber Lining Systems

By: Michael Gipsov, Rasko Ojdrovic, Anna Pridmore
Fiber Reinforced Polymer (FRP) composite lining systems are used by major municipalities throughout the United States to structurally rehabilitate and upgrade large diameter pipelines. For internal Carbon Fiber Reinforced Polymer (CFRP)
November 4, 2015

A Repair Program to Minimize Failure Risk of Highly Distressed PCCP Circulating Water Lines

By: Murat Engindeniz, Mehdi Zarghamee, Kevin Crosby, Ben Cluff
Arizona Public Service Company’s Cholla Power Plant has four units with circulating water lines made of 66 in. to 72 in. diameter prestressed concrete cylinder pipe (PCCP) in Units 2, 3, and 4. PCCP in these three units has been in
November 4, 2015

Watertightness of CFRP Liners for Distressed Pipes

Hydrostatic pressure tests of prestressed concrete cylinder pipe (PCCP) with bands of broken wires and lined with carbon fiber reinforced polymer (CFRP) have shown that certain CFRP laminates used as liners for remediation of distressed
October 15, 2015

Ice Dams: What You Should Know

During winter, building owners and managers are concerned about heavy snowfall on their roofs for two major reasons:  increased roof...

October 14, 2015

The Dark Side of Daylighting

By: Cheryl Saldanha, Davidson Norris, CNC

Daylighting is the controlled harvesting, redirection, and distribution of sun and ambient (sky) light to building interiors.  ...