风荷载作用下一体化智能筑塔机爬升系统结构响应分析

Structural Respond Analysis of Climbing System for Intelligent Integrated Pylon Building Machine Under Wind Loads

以伶仃洋大桥索塔施工所采用的一体化智能筑塔机为研究对象,探讨风荷载对其爬升系统结构的影响,采用Davenport风速谱与谐波叠加法获得不同自然风风速,建立了筑塔机架体及爬升系统的有限元模型,分析爬升系统在平均风作用下的应力和位移分布情况,并对比研究了不同架体爬升系统在施工、爬升及非工作工况下自然风对结构的响应规律。结果表明,在施工和非工作工况下,最大位移和最大应力发生在平衡梁处,在爬升工况下,位于下爬箱与顶升油缸连接处的两侧,且自然风作用下的节点应力和位移在一定范围内大于平均风作用,为筑塔机爬升系统的结构优化和工程应用提供参考。

Intelligent integrated pylon building machine(IIPBM), adopted for the cable tower construction of Lingdingyang Bridge, is the investigated object, and the aim is to evaluate the impact of wind loads on structure of its climbing system. Firstly, the Davenport wind spectrum and the harmonic superposition method are employed to achieve the natural wind velocities with different magnitudes. Then, the finite element models of climbing systems and scaffolds for IIPBM are developed, and the stress and displacement distribution of the climbing system are analyzed under the mean wind. In addition, the structural response behaviors of climbing systems for different scaffolds are compared and analyzed with working, climbing and non-working conditions under natural winds. The results show that the maximum displacement and maximum stress are located at the balance beam with working and non-working conditions, and which are situated on both sides of the connection between the lower climbing box and the jacking cylinder in climbing conditions. Furthermore, the stresses and displacements of the analyzed joints under the natural wind are greater than that of the mean wind in a certain range. The analysis results can contribute to the structural optimization and engineering application for the climbing system of IIPBM.