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70年代,许多发达国家在桥梁建造的总数中钢桥的比例增加了。这是由于修建大跨度桥梁的需要,例如大阪市就建造了一座跨度为510米的钢桥。广泛发展钢桥的另一个原因是在地震区较多采用轻型结构和在人口稠密的城市中需要快速施工。 高强度优质耐候钢的出现(附表),尽管价格昂贵,但仍促进了钢桥的发展。以每年用钢量相当大的(约60万吨)日本为例,在总长2,600公里的钢桥中,耐候钢就占了35％。但以后有所下降,钢桥的数量几乎减少一半。经过
In the 1970s, many developed countries increased the proportion of steel bridges among the total number of bridges built. This is due to the need to build a long-span bridge, such as Osaka, which built a steel bridge spanning 510 meters. Another reason for the widespread development of steel bridges is the greater use of lightweight structures in the earthquake zone and the need for rapid construction in densely populated cities. The emergence of high-strength, high-quality weathering steel (schedule), though expensive, has contributed to the development of steel bridges. Taking the annual steel output of a considerable amount (about 600,000 tons) in Japan, for example, weathered steel accounts for 35% of the total steel 2,600 kilometers in length. However, it declined in the future and the number of steel bridges was almost halved. after