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随着桥梁转体吨位不断增加,转盘及墩塔结构的受力越来越大,对其安全造成很大威胁,因而对转盘和墩塔结构进行详细的局部受力分析变得非常重要。该文结合山东邹城斜拉桥转体设计方案,采用Ansys软件建立了包括转盘、牵引盘、牛腿、撑脚、上部横梁以及部分塔柱的三维有限元模型,对牛腿结构、开槽底部以及上转盘底部混凝土及钢板等受力进行详细的分析。结果表明:1)牛腿和主墩的凹角处存在应力集中,需要加密配筋;2)合理的主墩开槽尺寸可以减少混凝土用量,但开槽需保证应力传递流畅并避免局部应力集中;3)上转盘底部混凝土存在受力不均匀现象,尤其在偏载情况下比较明显,需要包裹厚钢板使受力趋于均匀,以保证转体安全。
With the increasing of the tonnage of the bridge, the forces of the turntable and the pier structure are getting bigger and bigger, which pose a great threat to their safety. Therefore, it is very important to carry out detailed local stress analysis of the turntable and the pier structure. According to the swivel design scheme of Zoucheng cable-stayed bridge in Shandong province, a three-dimensional finite element model including turntable, traction disk, cow leg, supporting foot, upper beam and some pylons was established by Ansys software. Bottom and the turntable at the bottom of the concrete and steel such as force for a detailed analysis. The results show that: 1) There is stress concentration in the concave corner of the cow leg and the main pier, which needs to be reinforced by reinforcement; 2) Reasonable size of the main pier slot can reduce the amount of concrete used, but the slot should ensure smooth stress transfer and avoid local stress concentration; 3) There is uneven stress on the concrete at the bottom of the turntable, especially under partial load. The thicker steel plate needs to be wrapped so that the force tends to be uniform, so as to ensure the swivel safety.