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A truss with 14 joints needs 25 members, and so on.
At its simplest, bridge-building is all about stringing triangles of structural cross-members together to form of a truss that transfers the various loads acting on it to the ground.
"Doyle was naked save for his truss and a pair of boots which sparkled and crackled in the moonlight".
In 1974 David Plowden published a magnificent book of photographs of North America's most ingenious or graceful spans, showing their rich variety of structure (arch, truss, cantilever, suspension) and material (stone, wood, iron, steel, concrete).
Johnson and Nixon were bullies in a political system whose checks and balances truss a president hand and foot.
The first engineer to analyze correctly the stresses in a truss was Squire Whipple, an American who designed hundreds of small truss bridges and published his theories in 1869.
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The bridge itself is a "through-truss" design, meaning traffic travels through the structure rather than over it, increasing the chance of contact with passing vehicles.
WHEN an eight-lane steel-truss-arch bridge across the Mississippi River in Minneapolis collapsed during the evening rush hour on August 1st 2007, 13 people were killed and 145 were injured.
Unfortunately, apart from being a fracture-critical structure and a through-truss design, the bridge over the Skagit River is what is known as "functionally obsolete".
Nor have any through-truss designs been adopted for road use, though they are still used occasionally for railways.
Thus, engineers thus used a complex system of counterweights, pendulums, and steel-truss girders to allow the bridge to withstand winds of up to 180 miles (290 km) per hour.
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