关键词: 桥梁工程, 拱桥, 劲性骨架, 外包混凝土, 分环方案, 结构受力

Abstract: Taking Guansheng-Qujiang River Grand Bridge in construction in Guang’an as the research object, Midas/Civil 2015 was used to establish the finite element models of four different pouring cycle schemes respectively, and the complete construction process was calculated. The influence of different pouring cycle schemes on the structure mechanics during the externally wrapped concrete pouring process outside arch ring was discussed. It is discovered that the pouring cycle number will significantly affect the stress of stiff skeleton and the externally wrapped concrete. The greater the number, the gentler stress change and the less the stress of stiff skeleton. And the influence of the value of m1 on the stress of externally wrapped concrete is obvious. On the premise of meeting the bearing capacity, stability and construction safety, the greater the value of m1, the less stress of the externally wrapped concrete is. Finally, some suggestions are given in view of the construction speed and the stress of the structure.

Key words: bridge engineering, arch bridge, stiff skeleton, externally wrapped concrete, different pouring cycle schemes, structural mechanical properties