Ads
related to: truss bridge designer
Search results
Results From The WOW.Com Content Network
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units.The connected elements, typically straight, may be stressed from tension, compression, or sometimes both in response to dynamic loads.
The unpatented Paddleford Truss is only found in New England, The truss was designed by Peter Paddleford of Littleton, N.H. who had previously erected Long truss bridges. About 1846, he remodeled this design by replacing the counterbraces with a stiffening member fastened to the inside of the posts at points near the top and bottom chords.
The Waddell "A" Truss Bridge is standardized truss bridge design that was first patented in 1893 by prolific civil engineer John Alexander Low Waddell. The design provided a simple low-cost, high-strength solution for use by railroads across the United States and Empire of Japan for short spans of around 100 ft (30.5 m).
A Howe truss is a truss bridge consisting of chords, verticals, and diagonals whose vertical members are in tension and whose diagonal members are in compression. The Howe truss was invented by William Howe in 1840, and was widely used as a bridge in the mid to late 1800s.
Dr. John Alexander Low Waddell (January 15, 1854 – March 3, 1938, often shortened to J.A.L. Waddell and sometimes known as John Alexander Waddell) was a Canadian-American civil engineer and prolific bridge designer, with more than a thousand structures to his credit in the United States, Canada, as well as Mexico, Russia, China, Japan, and New Zealand.
That same year, the two men formed a bridge-building firm, Boody, Stone & Co., [10] which erected a large number of Howe truss bridges throughout New England. [8] Howe made additional improvements, and patented a second Howe truss design in 1846. [2] William Howe suffered a severe carriage accident and died on September 19, 1852.
The Pratt truss design remained popular as bridge designers switched from wood to iron, and from iron to steel. [20] This continued popularity of the Pratt truss is probably due to the fact that the configuration of the members means that longer diagonal members are only in tension for gravity load effects.
The Braga Bridge is a continuous truss bridge. It was the fourth longest span of this type when it was completed in 1966. This list of continuous bridge spans ranks the world's continuous truss bridges in two listings: The first is ranked by the length of main span (the longest length of unsupported roadway) and the second by the total length of continuous truss spans.