复杂索塔结构空间受力状态研究

索塔是缆索承重桥梁中的一重要受力构件,型式多样、荷载条件复杂,其最终的应力状态同桥梁施工过程密切相关,且空间受力特性明显。以一实际斜拉桥索塔为背景,采用实体退化系列单元模拟了整个施工过程,对索塔结构的空间应力状态进行了分析,探讨了索塔根部截面竖向正应力随施工过程的变化情况。分析结果表明索塔结构的竖向应力空间特性明显,施工过程中应力变化复杂。空间分析弥补了平面分析的不足,其结果对保证索塔安全、完善索塔设计具有实际意义,所采用的分析方法值得推广应用。

Study on Spatial Stress Status of Complex Cable Pylon Structure

The pylon is an important stressed member of the cable bearing bridge with complex shape and load conditions. Its ultimate stress status is closely related with the construction process of the bridge, and the spatial stress characteristic is obvious. Based on the pylon of a cable-stayed bridge, the degenerated solid elements are employed to simulate the whole construction process of pylon. The spatial stress status of the pylon structure is analyzed. The varying conditions of the sectional vertical positive stress at the root of pylon with the construction process are discussed. The analysis results show that the vertical stress spatial characteristic of the pylon structure is obvious, and the stress varying during the construction is complex. The spatial analysis covers the shortage of the plane analysis. Its result is the significant meaning for guaranteeing the pylon safety and perfecting the pylon design. The method used is worth to spread.