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山区桥梁受地形条件限制,往往需要跨越较大的河流和峡谷,因此大跨连续刚构桥是适应地形的最好方案。近年来,国内对连续刚构桥的一些病害产生了畏惧心理,导致设计阶段过于保守,走向了另一个极端。作者结合多座连续刚构桥的设计经验,分别从结构耐久性、主梁关键构造尺寸选取、受普遍关注的跨中下挠、高墩的二阶效应等方面进行了论述,提出了作者的一些认识和看法,希望能对类似工程设计有一定借鉴。
Due to the topographic conditions in mountainous areas, bridges and valleys often need to be crossed. Therefore, the long-span continuous rigid frame bridge is the best solution to the topography. In recent years, the domestic fear of some diseases of continuous rigid frame bridge, resulting in the design stage is too conservative, to the other extreme. Based on the design experience of several continuous rigid frame bridges, the author discusses the durability of the structure, the selection of the key structural dimensions of the main girder, the second-order effects of the cross-center deflection and the high pier which are generally concerned, Some understanding and opinion, hoping to have some reference to similar engineering design.