本文選題：特高壓鋼管塔　切入點(diǎn)：塔線體系　出處：《華北電力大學(xué)》2017年碩士論文

【摘要】：輸電線路作為重要的生命線工程,在電力建設(shè)中具有舉足輕重的地位。特高壓輸電線路能夠滿足大容量、長距離、高效率的電力輸送要求,將逐漸成為我國電力供應(yīng)的主要模式。特高壓輸電線路具有塔身高、跨度大、高柔性等特點(diǎn),更容易遭受地震作用的影響。因此,為了保證地震作用下電網(wǎng)能夠安全運(yùn)行,分析特高壓輸電塔線體系地震響應(yīng)是十分必要和有意義的。本文以1000kV特高壓鋼管塔及塔線體系為研究對(duì)象,通過ANSYS軟件建立了鋼管塔及其塔線體系的有限元模型,通過對(duì)比自重平衡狀態(tài)下導(dǎo)線與地線的水平應(yīng)力和弧垂的理論值與數(shù)值模擬值,驗(yàn)證了模型的正確性;采用Block Lanczos法對(duì)單塔和塔線體系兩種模型做了模態(tài)分析,分別提取了這兩個(gè)模型的固有頻率和模態(tài)振型,分析了導(dǎo)線和地線對(duì)單塔自振特性的影響;基于反應(yīng)譜理論,依據(jù)抗震設(shè)計(jì)規(guī)范得到了不同地震烈度和場(chǎng)地條件下的設(shè)計(jì)反應(yīng)譜,分析了特高壓鋼管塔的塔頂位移、支座反力和結(jié)構(gòu)應(yīng)力等控制變量最大值的地震響應(yīng),進(jìn)行了鋼管塔的抗震能力分析;選取了不同場(chǎng)地條件下的三種典型的地震波,采用最小均方速度法對(duì)地震波進(jìn)行基線修正,得到了更接近實(shí)際的地震波。采用時(shí)程分析法,對(duì)比分析了輸電塔及塔線體系模型在8度設(shè)防和罕遇地震烈度下的塔頂位移、桿件內(nèi)力和基底支座反力等控制參數(shù)的地震響應(yīng)特點(diǎn)和規(guī)律,為特高壓輸電塔進(jìn)行抗震分析和設(shè)計(jì)提供了一些理論依據(jù)和參考。除此之外,本文還分析了豎向地震對(duì)輸電塔線體系各控制參數(shù)的響應(yīng)規(guī)律,在豎向地震激勵(lì)下,豎向?qū)А⒌鼐�的位移值和支座反力值均比垂直和順線路方向有明顯的增大,應(yīng)該引起重視。
[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.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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本文編號(hào)：1709169