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为研究连续宽箱梁结构的空间效应,以南京市纬七路工程某预应力混凝土连续宽箱梁桥为例,采用Midas/Civil软件建立该桥上部结构空间梁格模型,分析了施工阶段和车辆荷载作用下,上部结构典型截面的应力分布。结果表明:施工阶段,截面局部拉应力值较大;成桥后,车辆活载作用下截面应力值较小,恒载起主导作用;截面应力分布不满足平截面假定,且边腹板处剪力滞效应显著,体现出空间效应显著,应采用更加精细化的模型进行此类结构分析。
In order to study the space effect of continuous wide box girder structure, taking a certain prestressed concrete continuous wide box girder bridge of Nanjing Weicheng Road as an example, Midge / Civil software was used to establish the beam girder model of superstructure of the bridge. The construction stage and Stress distribution of typical cross section of superstructure under vehicle load. The results show that the local tensile stress of the cross section is large during the construction phase. After the completion of the bridge, the cross-section stress of the vehicle under the live load is small and the dead load plays a leading role. The cross-section stress distribution does not satisfy the assumption of flat section, The force hysteresis effect is remarkable, which shows that the spatial effect is significant. Such a structural analysis should be carried out with a more elaborate model.