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预应力混凝土连续刚构桥梁因设计理论明确,施工工艺成熟,运营期养护费用少而受到工程界的欢迎,是一种比较经济合理的桥型。但是新桥规(JTG D 62—2004),对主梁应力的控制比旧桥规严格;同时,已建和在建的预应力混凝土连续刚构桥,也出现了主跨跨中下挠、中跨跨中出现纵向裂缝及腹板斜裂缝等问题。笔者在跨径组合为112 m+2×200 m+112 m的富湾大桥设计中,结合规范,对富湾大桥在构造尺寸的选取和防止出现连续刚构桥常见病害等方面进行了探讨。
Prestressed concrete continuous rigid frame bridge due to the design theory is clear, the construction process is mature, less maintenance costs during operation and welcomed by the engineering community, is a more economical and reasonable bridge. However, the new bridge gauge (JTG D 62-2004) controls the stress of the main girder more strictly than the old one. At the same time, the prestressed concrete continuous rigid-frame bridge, In the span there are vertical cracks and web diagonal cracks and other issues. In the design of Fuwan Bridge with a span combination of 112 m + 2 × 200 m + 112 m, this paper discusses the selection of structural dimensions and the prevention of the common diseases of continuous rigid frame bridge in combination with the norms.