University

See "Album of Designs of the Phoenix Bridge Company."

The theory of the equilibrium of arches, until of late years, commanded but little attention from practical men, partly owing to the fact that, since it was derived from observations of their own failures and successes, it came rather too late to be of much service to them, but chiefly owing to the form in which it was presented by mathematicians, who, by giving a fictitious importance to insignificant matters, effectually obscured the broad truth, that the whole question was essentially a comparatively simple problem of weight and leverage.

Eugene Figg, Jr., loves bridges. His company, the Figg Engineering Group, of Tallahassee, Florida, is the only national engineering firm in America that does nothing but bridges. He loves to talk about the bridges he’s built, how they’re faring, how the people who own them feel about them now.

He’s proud of the ones that came in early and under budget (like the Natchez Trace Parkway Arches, budgeted for $15 million, brought in for $11 million). He’s equally proud of the ones that won major design awards. The National Endowment for the Arts began giving Presidential Design Awards in 1984. A total of 41 awards have been given, only five for bridges, and Figg got three of those: Lin Cove Viaduct in North Carolina (1984), Sunshine Sky Bridge in Florida (1988) and the Natchez Trace Parkway Arches in Tennessee (1995). Figg’s pride in his bridges doesn’t come off like vanity; it’s more like a parent talking to anyone who’ll listen about a child who is doing well in the world.

He was in Buffalo last week for a conference of the Association for Bridge Construction and Design, where he spoke about bridge permitting and community involvement issues, and about the community design charettes for which he has become famous. He also managed to talk with a good number of people involved in the Peace Bridge expansion: Buffalo Development Commissioner Joseph Ryan, Common Council President James Pitts, the Buffalo News editorial board, the Public Bridge Review Panel’s Technical Review Subcommittee, and about 75 people at D’Youville College, a meeting incorporated into one of the New Millennium Group’s informational sessions.

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Bridges are employed to support weight over an open space, and transfer this weight to their supports, or abutments. They may be fundamentally classified by the reactions they exert upon their abutments. They may push on the abutments, pull on them, or simply rest on the abutments without horizontal forces. In general, the production of horzontal forces in the bridge structure is the cost of transferring the weight of bridge and load to the abutments. Bridges are generally, and less fundamentally, classified by the type of construction. Arch bridges push on their abutments, suspension bridges pull on them, while beams and trusses rest on their abutments without horizontal forces. The term beam is used when the material of the bridge is in a single piece, such as a log or a plate girder, while a truss is built up of pieces, called members. A truss generally has an upper chord in compression, a lower chord in tension, and web members consisting of diagonal or vertical ties (if in tension) or posts (if in compression).

We call the confluence of the Harlem and the East Rivers in New York City Hell's Gate. Dramatic, I suppose, but why not! A bridge opened over Hell's Gate in 1917. It's an arch of iron girders. The arch thickens at each end. It thins toward the center. You get a feeling of buoyancy looking at it.

Othmar Ammann, who designed the bridge, caught Hell for it. This, says writer Christopher Bonanos, was an age of ornament, gravity, solidity, and dignity. Ammann's design was imperfect in some ways. But its simplicity, lightness, and freedom signaled a new era in design.

Civil engineer.
Born: 26 December 1867 Sandgate, Queensland, Australia. Died: 23 September 1943 Gordeon, New South Wales, Australia.
John Job C. Bradfield was associated with a great range of engineering works including the Cataract and Burrinjuck Dams, the Sydney Underground Railways and Brisbane's Story Bridge. He was, however, best known as one of the original designers of the Sydney Harbour Bridge. For his thesis on the design and construction of the Sydney Harbour Bridge and the city railway system, Bradfield was awarded the degree of Doctor

It will be the effort of the writer in the following pages to point out the peculiarities of material and construction involved in the designing and building of “Iron Highway Bridges,” in the hope that a dissemination of their scientific principles in a popular form, will bear fruit in a more thorough appreciation of a noble art, and in elevating the standard of requirements of this very important class of public works. The subject has been divided into two parts, each complete in itself; the one general and descriptive, and the other analytical. The former is peculiarly intended to present to public committees entrusted with the letting of bridge contracts such information as they ought to possess, while the latter is offered as an aid to engineers not experts in this branch of the profession, and yet who are often called upon to act as inspectors.

I'm looking at two photographs, both taken in late August, 1907. In one, a great cantilever structure extends almost 900 feet from its pier -- half a huge bridge over the St. Lawrence River -- 40 million pounds of structural steel reaching toward Quebec. The second photograph is not so pretty. It shows 40 million pounds of what looks like wet spaghetti, splashed across the ground, leading away from the pier and off into the water.

For eight years the Quebec bridge project had been under the direction of an American engineer. He was Theodore Cooper, the biggest name in bridge building. Cooper had never produced a true superlative, and his first move was to extend the span from 1600 to 1800 feet. That got the piers out of the water and on to dry land. But it also made this the largest cantilever span ever attempted.

Begun in 1867 and completed in 1874, the Eads Bridge was named after its designer, James Buchanan Eads. It was the first bridge to span the Mississippi at St. Louis, the first bridge to make significant of steel, and one of the first bridges in the U.S. to make use of pneumatic caissons (the caissons sunk for the bridge are still among the deepest ever). It was also the first bridge to be built entirely using cantilever construction methods, avoiding the need for falsework, and the first bridge designed so that any part could be removed for repair or replacement. The bridge is now a National Historic Landmark.