August 5, 2016

Construction Dewatering: Understanding its effect on below-grade waterproofing

By: Daniel Gibbons, Payal Vora

Construction site dewatering is used to locally control and lower groundwater levels in the vicinity of the excavation. This is typically done to maintain soil conditions needed during, and occasionally after, construction—for example, to...

August 3, 2016

Evaluation of the Impact of Typical Imperfections in Hand-Applied CFRP Liners in Pressure Pipelines by Hydrostatic Testing

By: Rasko Ojdrovic, Murat Engindeniz, Nico Meyer, Scott Arnold

Fiber Reinforced Polymer (FRP) rehabilitation systems have validated efficacy in structural rehabilitation of pipelines since the first installation in the early 1990s. The hand applied layers of carbon and glass FRPs allow for time...

August 3, 2016

DC Water 22-Foot Brick Sewer Emergency Repair

By: Rasko Ojdrovic, Murat Engindeniz, Steve Bian, Anna Pridmore, Ben Deaton

In 2014, a five (5) story residential house was constructed in a residential area of Washington D.C. directly over the top of DC Water’s North East Boundary Trunk Sewer (NEBTS) without prior knowledge of DC Water. Based on the...

August 3, 2016

Discovery to Solution Implementation: NTMWD Addresses Degraded Piping under a Major Highway

By: Rasko Ojdrovic, Murat Engindeniz, Steven Long, Travis Markham, Mike Larson, Anna Pridmore

The North Texas Municipal Water District (NTMWD) is a water conservation and reclamation district created by an act of the Texas Legislature in 1951. Today NTMWD’s Regional Water System provides drinking water to over 1.6...

August 3, 2016

Evolution of the CFRP Repair of Pipelines—The Road to a Well-Established Technology

As with any technology, internal repair of pipelines using carbon fiber reinforced polymer (CFRP) composites has evolved since its first use in the United States in late 1990s, and the current state of the art in design, installation...

June 29, 2016

Structural Engineering Licensure: Critical to Our Future

By: Glenn Bell, Andrew W. Herrmann

The June 2016 issue of Structure Magazine includes an editorial by Glenn Bell and Andrew W. Herrmann, President-Elect of the Structural Engineering Institute. The article, “Structural Engineering Licensure: Critical to Our...

June 29, 2016

Shear Resistance of Paving and Waterproofing Systems

By: Gregory Doelp, Philip Moser, Joseph Haydu, Bridge Preservation LLC

Waterproofing systems installed on bridge decks, elevated parking decks, and similar structures often have paving systems over them to protect the waterproofing and to provide a surface suitable for vehicular traffic. Vehicular loads are...

June 3, 2016

PIANC Guidelines: Oil and Petrochemical Terminal Design

By: Martin Eskijian, Ron Heffron, William Asante, Gayle Johnson, Jerko Kocijan

This new PIANC reference will provide a set of recommendations to the global community involved in the initial design, analysis, or upgrade of marine oil and petroleum terminals. Potential users include owners/operators, port...

June 3, 2016

Effect of Moored Vessels on Seismic Response of Structures

By: Rod Iwashita, Julie Galbraith, Marc Percher, Gayle Johnson

In current design practice any vessel at berth during an earthquake event is ignored. This is rationalized based on the frequency of vessel calls in combination with the infrequency of significant earthquakes and the long response...

June 3, 2016

Comparison of Procedures for Computing Seismic Displacement Demand

By: William Bruin, Rakesh Goel, Julie Galbraith

For the seismic design of pier and wharf structures, there are multiple methodologies permitted for determining displacement demands. The current edition of MOTEMS and ASCE 61-14 permits use of an iterative substitute structure...