designed to resist oscillation induced by the wind. The main cables, fixed in the massive anchorages and passing through the tops of towers, were spun from 290 strands of galvanized steel wire—a newly developed technology—each containing 127 filaments about 0.2 inch (5 millimeters) in diameter. Their high strength does away with the need for double cables, and because they achieve a sag:span ratio of 1:10, the height of the main towers could be reduced. To prevent corrosion of the cables in the salt atmosphere, dehumidified air flows through a hollow inside them, removing moisture. The towers and the suspended structure are all finished with high-performance anticorrosive coatings to suit the demanding marine environment.

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Akashi-Kaikyo Bridge; Kobe, Japan, 1988–1998.

From the main cables, polyethylene-encased, parallel-wire-strand suspension cables support the truss-stiffened girder that carries a six-lane highway with a traffic speed of 60 mph (100 kph). The preassembled truss members were hoisted to the deck level at the main towers, carried to their location by a travel crane, and connected; then the suspension cables were attached. This construction technique was chosen because it did not disrupt activity on the water, where 1,400 ships daily pass through the straits.

Further reading

Thomas, Mark. 2001. The Akashi-Kaikyo Bridge: World’s Longest Bridge. New York: Rosen Publishing Group.

Alberobello trulli

Italy

The Murgia dei Trulli, with its communes of Martina Franca, Locorotondo, Cisternino, and Alberobello, is located in the Apulian interior at the upper part of the heel of Italy. Although trulli are scattered throughout