A Landmark's Legacy

Double Duty: Approach Structures
The new Sarah Mildred Long Bridge, which connects the cities of Kittery, Maine, and Portsmouth, New Hampshire, features precast, posttensioned concrete, segmental box girder approaches in a stacked configuration...

Crossing the Forth
Scotland’s Queensferry Crossing spans the Firth of Forth, connecting Edinburgh and the Kingdom of Fife. Built at a cost of $1.89 billion in six and a half years, the 1.6 mi long cable-stayed bridge, with...

Reliability-Based Design (RBD) For Everyone: (No Monte Carlo Simulation Required!)
In North America, the design of earth structures for transportation applications is most often carried out using load and resistance factor design (LRFD). In the U.S., the AASHTO LRFD Bridge Design Specifications...

An Unknown-Unknown Does In An Overpass: A Soil Stockpile on Soft Clay Is Too Much for a Bridge in Canada
Like most structures, bridges are designed for an array of loading conditions. Some loads are known or can be reasonably estimated with confidence (i.e., known-knowns, such as structure dead and vehicular...

The State of Soil Improvement in China: The G-I Soil Improvement Committee’s China Scan Tour
During the last four decades, China has made significant improvement in various sectors of its infrastructure, including high-speed railways, long-span and cross-sea bridges, large dams, long- and large-diameter...

Connecting Continents: Challenges of the Eurasia Tunnel in Istanbul
The Eurasia Tunnel, the first bored tunnel crossing of the Istanbul Strait (Bosphorus) in Istanbul, Turkey, is a site that presents many unique challenges, including very poor ground conditions, unusually...

Replacing an Icon
Since 1852, the Portage Viaduct has carried a rail line across the Genesee River Gorge, near the town of Portageville, New York. First made of timber, then replaced with a wrought iron structure after...

Tied Together
The replacement of the John Greenleaf Whittier Memorial Bridge was one of the signature projects of the Massachusetts Department of Transportation's $3-billion accelerated bridge construction program....

Crossing Grand Canyon: The Kaibab Trail Suspension Bridge
Recently named a national historic civil engineering landmark in ASCE's Historic Civil Engineering Landmark Program, the 1928 Kaibab Trail Suspension Bridge proved uniquely challenging to access, spanning...

Next-Generation Drones Bolster Bridge Inspections
A preflight, flight, and postflight drone system saves time and money in bridge inspections. It can also create a digital "twin" of bridges....

Design Details (part of "Uplifted")
In all projects, the interconnectivity of each component is important. A movable bridge is an especially complicated structure that is exposed to an array of dynamic movements and transient loading conditions...

Uplifted
The new Fore River Bridge, near Boston, leaves more room vertically and horizontally for passing ships, and its lift towers employ several cost-saving innovations....

Arena of Books
The new Qatar National Library features a folded design with cantilevered corners on the exterior, while inside, an enormous single space for reading or socializing offers terraces stacked with bookshelves....

Turn for The Better
The Johnson Street Bridge has served as a critical link to the city of Victoria, British Columbia, Canada, for many years. A single-leaf bascule bridge that is functional and visually appealing replaced...

Monumental Makeover
Visitors to St Louis's iconic Gateway Arch can now enjoy an even more monumental experience, thanks to an expanded underground museum with a new glazed entrance. The $380-million project also features...

Originality Built In
The new Goethals Bridge linking New Jersey and New York is a twin cable-stayed crossing that incorporates an innovative cable-stayed anchor in its towers, which angle outward to keep melting in off the...

Bridging History
The Pennsylvania Department of Transportation recently rehabilitated the Frankford Avenue Bridge, also known as the Pennypack Creek Bridge. This stone-arch structure, originally built circa 1697, is the...

Next-Generation Sonar Improves on Best Existing Technology
A sonar system capable of visualizing underwater environments in real time can be used for underwater bridge inspections and other construction-related tasks....

Bridging the Hudson
Replacing New York State's Tappan Zee Bridge involved traversing more than just water; the team also crossed the hurdles of poor foundation conditions and the enormous scale of the crossing. Creative solutions...

 

 

 

 

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