Bridges and Tunnels by Jenn Vaughn

By Jenn Vaughn

Bridges and tunnels are lifelines. humans have tackled probably insurmountable stumbling blocks, together with sizeable canyons and mountain levels, to layout and build those outstanding passageways. Bridges and Tunnels: examine Feats of Engineering invitations young children a long time nine and as much as discover the innovation and actual technology at the back of constructions our international is determined by. trivialities and enjoyable evidence illustrate engineering ingenuity and achievements. actions and initiatives motivate little ones to benefit in regards to the engineering procedure and to embody trial and blunder.

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Engineering relies on triangles to construct trusses, a network of beams and bars. Trusses can be added above beam bridges or beneath their beams. They add support without adding excessive weight. 28 WORDS to KNOW girder: a large beam, often made of steel. abutment: a structure that supports a bridge, one at each end. truss: a rigid framework of beams or bars that supports structures such as bridges. Building Big: the Physics of Bridges The beam and abutments are designed to withstand compression and tension.

Eurasia Marathon runners span two continents when they race across the bridge every October. The race celebrates peace and friendship. 55 Bridges and tunnels Khaju Bridge (Isfahan, Iran, 1667) °° Stone and brick arch bridge spans the Zayandeh River: 344 feet (105 meters). °° Covered in brightly colored tiles and adorned with seventeenth-century artwork, it boasts a magnificent pavilion and cool, shady walkways. Suez Canal Bridge (El Qantara, Egypt, 2001) °° World’s highest cable-stayed suspension bridge spans Suez Canal to link the continents of Africa and Asia: 120 miles (193 kilometers).

WORDS to KNOW civilization: a community of people that is advanced in art, science, and government. beam: a rigid horizontal structure that carries the load. 24 Building Big: the Physics of Bridges They scouted around for logs. One log was rotted, crumbling, and crawling with bugs. Another, solid and sturdy, was way too short. Finally, one of the kids found a long, hefty log. Working together, the family tackled different methods of positioning the log across the stream. Some squatted at the water’s edge.

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