目前,预应力混凝土斜拉桥已成为主跨200～700m的主要桥式之一。自从1962年马拉开波(Manacaibo)大桥建成以来,越来越多的预应力混凝土斜拉桥得以实施。可以证明,跨度在700m以下的混凝土斜拉桥往往要比钢斜拉桥更经济。例如,美国计划建造的主跨为396m的达姆角(Dame Point)大桥,1979年进行投标,最优钢斜拉桥投标价 At present, the prestressed concrete cable-stayed bridge has become one of the main bridges with main span of 200 ~ 700m. Since the completion of the Manacaibo Bridge in 1962, more and more prestressed concrete cable-stayed bridges have been implemented. It can be shown that concrete cable-stayed bridges with a span of less than 700 m tend to be more economical than steel cable-stayed bridges. For example, the United States plans to build a main span of 396m Dame Point (Dame Point) bridge, bidding in 1979, the optimal steel cable stayed bridge bid