特高压格构式输电塔线体系振动台试验设计

特高压输电塔线体系具有跨越档距大、塔体高的特点,进行地震模拟振动台试验测试时,现有结构试验方法难以完成.本文以特高压交流单回路输电线路工程为背景,设计制作了三塔两线体系缩尺模型,文中详细阐述了振动台试验的模型设计工作,其中包括试验材料的选取、动力相似关系的确定、模型的制作以及试验方案设计等方面.针对由强几何非线性的导、地线与弹性输电铁塔这两种不同形式的结构所组成的耦联体系提出了动力参数分离式模型设计方法,解决了塔线体系按统一比例无法满足振动台台面尺寸要求的问题.理论分析和实测对比验证了该模型较好地满足了振动台试验要求,该方法使得通过振动台试验研究特高压输电塔线体系的地震反应得以实现.

Shaking Table Test Model Design for UHV Latticed Transmission Tower-line Coupling System

Ultra high voltage(UHV) latticed transmission tower-line coupling system is characterized by long-span and high-rise, and the existing experimental methods can not complete the shaking table tests. This paper designed a coupled system model consisting of three towers and two-span conductors, which took a single-circuit AC transmission project as the prototype. The material selection, the dynamic similarity relations and the design of the test plan for shaking table model of UHV transmission tower-line coupled system were introduced. To simulate the different dynamic characteristics between elastic latticed transmission tower and flexible transmission conductors and ground wires which show strong geometrical nonlinearity, separated dynamic parameter scale ratios for the two parts were used independently in the design of the system, which can solve the trouble that the span of transmission line is too long to fit within the shake table in the same proportions as the tower. Shaking table test requirements can be satisfied by comparing theoretical analysis with the actual measurements of the system model.