潮州大桥大体积0号块多次浇筑临时支架力学性能应用研究

以潮州大桥工程为依托,探讨大体积0#块在多次浇筑过程中临时钢管支架的受力和变形,阐述了混凝土斜拉桥悬臂施工0#块临时支架的结构设计和计算方法。用有限元分析软件MIDAS建立了0#块、塔柱和支架整体的空间分析模型,并采用梁格法处理复杂的主梁结构,对潮州大桥主桥0#块多次浇筑进行施工过程模拟,分析各工况下临时支架及混凝土梁的受力情况。同时通过有限元程序计算结果与实际现场试验数据比较来验证数值分析的合理性。结果表明,大体积0#块混凝土多次浇筑可以减小支架系统所承受荷载,已经浇筑的混凝土将与临时支架系统一起共同受力。在多次浇筑过程中,采用了分次张拉预应力的方法,可以增强先前浇筑混凝土梁的抗弯性能,保证了后续浇筑的安全可靠。

Application Research on Temporary Support Mechanical Properties of the Large Volume 0# Block Repeatedly Pouring in Chaozhou Bridge

Based on the Chaozhou Bridge project, the stress and deformation of the temporary steel pipe supports during the pouring process of the large volume 0# block were discussed. The structure design and calculation method of the 0# block temporary support for the cantilever construction of the concrete cable-stayed bridge were described in this thesis. The Spatial analysis model of the 0# block, the tower and the general support was established by the finite element analysis software MIDAS and Beam Grid Method was adopted to deal with complex girder structure. The construction process of the 0# block repeatedly pouring in the Chaozhou Bridge has been simulated to analysis the force condition of temporary support and concrete beam under different conditions. At the same time, the rationality of numerical analysis was verified by comparing the numerical results with the actual field test data. The results show that repeatedly pouring of the large volume block can reduce the load of the support system, and the temporary support system will be involved in the force with the casted concrete. In the process of repeated pouring, the flexural behavior of concrete beams can be strengthened by using the graded prestressed method which can ensure the safety and reliability of the subsequent pouring.