长联大跨混凝土连续箱梁桥悬臂施工合龙方案分析

文章以一座8跨长联悬臂施工的预应力混凝土连续箱梁桥为例,探讨了长联大跨PC连续梁桥的合龙顺序对结构的影响。计算分析表明:不同的合龙方案对主梁应力影响有限,但对主梁的累计位移影响较大;长联大跨连续梁桥,尤其要注意“Π”构单侧和“T”构的合龙,会导致成桥线形和主梁应力均有较大的变化,施工时应尽量避免。

Taking an 8-span long cantilever prestressed concrete continuous box girder bridge as an example, this paper discusses the influence of the closing sequence of the long span PC continuous beam bridge on the structure. The calculation and analysis show that different closing schemes have limited influence on the stress of the main beam, but have a great influence on the cumulative displacement of the main beam;in building the long span continuous beam bridge, special attention should be paid to the closure of the "Π"structure and the "T" structure, which will lead to great changes in the shape of the bridge and the stress of the main beam, thus should be avoided during construction.