Sound Solution
A timber dock built in Kodiak, Alaska, in 1965 and used for ferry service, bulk fuel deliveries, and general cargo operations was recently reconstructed to meet current displacement-based seismic design...

Guidelines for Construction Vibrations: How Much Rattle is Too Much?
The study of construction/blast-related ground vibrations on structures, people, and objects is a surprisingly diverse field. Vibration sources vary from blasting, all types of construction equipment,...

Claims against Geotechnical Engineers: Getting it Right in the Midst of Uncertainty
Geotechnical engineering is one of engineering's riskiest professions, prone to litigation due to the inherent uncertainty associated with characterizing the subsurface. Site investigations rarely provide...

Diving Into Engineering
When the underwater portions of a bridge or waterfront facility need to be inspected, the right person for the job is often an engineer diver, a specially trained professional who understands load paths...

Attractive Alternative
The Lewis and Clark Bridge, an elegant cable-stayed bridge with diamond-shaped towers, connects highways in Indiana and Kentucky that had long been truncated and provides a clear alternative for interstate...

Value Engineering Shaves Years and $1.8 Billion from Ohio River Bridges Project (part of "Attractive Alternative")
A value engineering process for the Ohio River Bridges Project, of which the Lewis and Clark Bridge is just one part, saved more than $1.8 billion and shaved nine years from earlier estimates....

Trestle Triumph
As part of improvements to a marine oil terminal in California, the design team had to ensure that a nearly century-old timber trestle met contemporary requirements related to operations, seismic activity,...

Pedestrian, Cyclist Bridge in Utrecht Crosses School Roof and Canal

Grand Performance
The tallest tower in the city of Los Angeles was created using performance-based seismic design, a method that involves modeling and studying a specific building’s behaviors under real-world earthquake...

Big River Crossing
The Harahan Bridge, a double-track railroad bridge built in 1916, spans the Mississippi River between Memphis, Tennessee, and West Memphis, Arkansas. A century later, one of the former wagonways on the...

Parallel Line
The Manahawkin Bay Bridge carries Route 72 from the mainland of Ocean County, New Jersey, to the seaside destination of Long Beach Island. Since the route is the only vehicular link to the island, the...

Synchronized Swinging
Very much in keeping with its setting, the new north bridge on Florida’s Boca Grande Causeway, like its predecessor, spans the Gulf Intracoastal Waterway. Constructing the new bridge’s swing span presented...

The Ups and Downs of Drone Inspections
Minnesota recently completed a trial using unmanned aircraft systems to inspect bridges. They found that the drones have their advantages—and disadvantages....

World’s Longest Pedestrian Bridge Opens in Switzerland

Bridge Inspections Come of Age
Arising from the tragic collapse of a West Virginia bridge 50 years ago this month, the National Bridge Inspection Program has helped keep bridges in the United States safe for motorists for decades. The...

A Pioneering Structure: The Eads Bridge
Though he was not trained as an engineer, James Buchanan Eads had the vision and will to design one of the great bridges of the 19th century. The Eads Bridge, spanning the Mississippi River at St. Louis,...

Built from Below
The $95-million effort to first widen and then replace the 1,315 ft long Fox River Bridge, in Elgin, Illinois, faced myriad obstacles, including the need to avoid causing traffic delays on a busy stretch...

Faithful Rehabilitation
History, culture, religion, and engineering all intertwined in a recent project in Jerusalem to rehabilitate and strengthen the site believed to be the tomb of Jesus of Nazareth. Modern methods, including...

From Disaster to Prevention: The Silver Bridge
The 1967 collapse of the Silver Bridge, which connected West Virginia to Ohio, killed 46 people and led to the creation of a nationwide, standardized bridge inspection program....

Seismic Data from Smartphones: MyShake: Building a Global Smartphone Seismic Network
Increasing the density of earthquake-monitoring instruments at a fast rate and at a low cost is a dream for many researchers who study earthquakes. MyShake, a smartphone application developed by the Berkeley...

 

 

 

 

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