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现代的预应力技术到20世纪30年代才臻于成熟。1937年以后,德国首先修建了一些预应力混凝土公路桥;至于预应力混凝土铁路桥的发展,则在1945年第二次世界大战结束以后才开始。预应力混凝土桥可节约大量钢材;它的刚度、实际的安全系数、超载卸去以后的恢复能力等均比同样跨度的钢桥为优越;行车时的振动和噪音远比钢桥为小;维修保养工作远较钢桥为少;对于各种
Modern prestressing technology did not reach maturity until the 1930s. After 1937, Germany first built some prestressed concrete highway bridges; as for the development of prestressed concrete railway bridges, it began after the end of the Second World War in 1945. Prestressed concrete bridges can save a lot of steel; its stiffness, the actual safety factor, overloading after the removal of the recovery capacity than the same span of the steel bridge is superior; vibration and noise when driving much smaller than the steel bridge; maintenance Maintenance work is far less than the steel bridge; for a variety