特高压钢管塔地震响应分析

发布时间：2018-04-04 08:29

本文选题：特高压钢管塔　切入点：塔线体系　出处：《华北电力大学》2017年硕士论文

【摘要】：输电线路作为重要的生命线工程,在电力建设中具有举足轻重的地位。特高压输电线路能够满足大容量、长距离、高效率的电力输送要求,将逐渐成为我国电力供应的主要模式。特高压输电线路具有塔身高、跨度大、高柔性等特点,更容易遭受地震作用的影响。因此,为了保证地震作用下电网能够安全运行,分析特高压输电塔线体系地震响应是十分必要和有意义的。本文以1000kV特高压钢管塔及塔线体系为研究对象,通过ANSYS软件建立了钢管塔及其塔线体系的有限元模型,通过对比自重平衡状态下导线与地线的水平应力和弧垂的理论值与数值模拟值,验证了模型的正确性;采用Block Lanczos法对单塔和塔线体系两种模型做了模态分析,分别提取了这两个模型的固有频率和模态振型,分析了导线和地线对单塔自振特性的影响;基于反应谱理论,依据抗震设计规范得到了不同地震烈度和场地条件下的设计反应谱,分析了特高压钢管塔的塔顶位移、支座反力和结构应力等控制变量最大值的地震响应,进行了钢管塔的抗震能力分析;选取了不同场地条件下的三种典型的地震波,采用最小均方速度法对地震波进行基线修正,得到了更接近实际的地震波。采用时程分析法,对比分析了输电塔及塔线体系模型在8度设防和罕遇地震烈度下的塔顶位移、杆件内力和基底支座反力等控制参数的地震响应特点和规律,为特高压输电塔进行抗震分析和设计提供了一些理论依据和参考。除此之外,本文还分析了竖向地震对输电塔线体系各控制参数的响应规律,在竖向地震激励下,竖向导、地线的位移值和支座反力值均比垂直和顺线路方向有明显的增大,应该引起重视。
[Abstract]:As an important lifeline project, transmission line plays an important role in electric power construction.UHV transmission lines can meet the requirements of large capacity, long distance and high efficiency, and will gradually become the main mode of power supply in China.UHV transmission lines have the characteristics of tower height, long span, high flexibility and so on.Therefore, it is necessary and meaningful to analyze the seismic response of UHV transmission tower system in order to ensure the safe operation of power grid under earthquake.In this paper, the finite element model of 1000kV ultra-high pressure steel tube tower and its tower line system is established by ANSYS software.The correctness of the model is verified by comparing the theoretical and numerical simulation values of horizontal stress and sag between conductors and ground wires in the state of deadweight equilibrium, and the modal analysis of two models of single tower and tower line system is done by using Block Lanczos method.The natural frequencies and modal modes of the two models are extracted, and the influence of wire and ground wire on the natural vibration characteristics of a single tower is analyzed, which is based on the theory of response spectrum.According to the seismic design code, the design response spectra under different seismic intensity and site conditions are obtained, and the seismic responses of the maximum control variables such as tower top displacement, support reaction force and structural stress are analyzed.The seismic capacity of the steel pipe tower is analyzed and three typical seismic waves under different site conditions are selected. The minimum mean square velocity method is used to correct the baseline of the seismic wave and a seismic wave closer to the actual condition is obtained.By using time history analysis method, the seismic response characteristics and rules of tower top displacement, internal force of pole and reaction force of base support of transmission tower and tower line system model under 8 degree fortification and rare earthquake intensity are compared and analyzed.It provides some theoretical basis and reference for seismic analysis and design of UHV transmission tower.In addition, the response law of vertical earthquake to the control parameters of transmission tower system is analyzed. Under the vertical earthquake excitation, the displacement value and support reaction force value of vertical guide and ground line are obviously increased than that of vertical and down-line direction.Attention should be paid to it.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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