土木工程毕业设计外文翻译--公路工程-建筑结构(编辑修改稿)

土木工程毕业设计外文翻译--公路工程-建筑结构(编辑修改稿)内容摘要：

good, twolane highways, but Germany39。 s Autobahn or motorway had made me see the wisdom of broader ribbons across the land. It would take another war before the federal government would act on a national highway system. During World War II, a tremendous increase in trucks and new roads were required. The war demonstrated how critical highways were to the defense effort: 10 thirteen per cent of defense plants received all their supplies by truck, and almost all other plants shipped more than half of their products by vehicle. The war also revealed that local control of highways had led to a confusing variety of design standards. Even federal and state highways did not follow basic standards. Some states allowed trucks up to 36,000 pounds, while others restricted anything over 7,000 pounds. A government study remended a national highway system of 33,920 miles, and congress passed the FederalAid Highway Act of 1944, which called for strict contractcontrolled design criteria. The interstate highway system was finally launched in 1956 and has been hailed as one of the greatest public projects of the century. To build 11 its 44,000 mile web of highways, bridges, and tunnels, hundreds of unique engineering designs and solutions had to be worked out. Consider the many geographic features of the country: mountains, steep grades, wetlands, rivers, deserts and plains. Variables included the slope of the land, and the ability of the pavement to support the load. Innovative designs of roadways, tunnels, bridges, overpasses, and interchanges that could run through or bypass urban areas soon began to weave their way across the country, forever altering the face of America. Longspan, segmentedconcrete, cablestayed bri。