本文選題：螺栓滑移　切入點：輸電塔線體系　出處：《中國科學技術大學》2017年碩士論文

【摘要】：輸電線路是我國電網的大動脈,為國計民生提供堅強的后盾。輸電塔線體系擁有大跨、高柔等特點,在強風、地震、冰凍雨雪等自然條件下,輸電塔極易發(fā)生倒塔破壞。其中,與輸電線之間的耦合作用,使得塔線體系的動態(tài)特性、風振響應更加復雜,相關的深入研究可以為輸電線路的設計提供參考。本文以課題組承擔的某實際工程項目中的ZM-11貓頭型單回路輸電塔為背景,針對其塔線體系的動態(tài)特性以及風振響應進行研究。論文的主要內容包括:(1)風場模擬介紹了脈動風速的基本特性以及線性濾波法中的自回歸模型(AR)�；诖四Ｐ�,給出了利用MATLAB軟件模擬的具有空間相關性的給定Davenport譜的脈動風速時程曲線的步驟,并將風速時程通過FFT變換所獲得的譜與目標功率譜進行對比,驗證了此種模擬方法的合理性和有效性。在此基礎上,通過風速與風荷載的轉換關系式得到風荷載時程曲線,以此來計算輸電塔線體系的風振響應。(2)輸電塔線體系的有限元建模及動態(tài)特性分析課題組針對輸電塔中典型的螺栓接頭,包括單螺栓、雙螺栓、三螺栓連接接頭進行了軸向拉伸試驗,得到相應的位移-載荷曲線�；贏NSYS建立了螺栓連接的三維有限元模型,得到的位移-載荷曲線與試驗結果作對比,利用相關的模擬參數,模擬得到塔腿與塔腿螺栓連接的位移-載荷曲線。利用非線性彈簧單元將位移-載荷曲線引入整塔的有限元模型中,建立考慮螺栓滑移的有限元模型。比較滑移模型與兩種不考慮螺栓連接影響的傳統(tǒng)有限元模型的模擬結果,驗證了滑移模型的數值計算更接近試驗測量結果。以這三種模型為基礎,建立相應的輸電塔線耦合體系,其中包括單塔雙線和雙塔三線體系,對其進行模態(tài)分析研究其動態(tài)特性,并提出螺栓滑移對輸電塔及其塔線體系的動態(tài)特性的影響規(guī)律。(3)輸電塔線體系的風振響應有限元分析考察了垂直輸電線方向不同風速作用下輸電塔線體系的時域響應,得出風速、塔線耦合效應以及螺栓滑移對輸電塔風振響應的位移、加速度均方根的影響。通過對比擬靜力風載作用下的桿件內力,研究風載作用下螺栓滑移對輸電塔線體系動態(tài)響應內力方面的影響。
[Abstract]:The transmission line is the main artery of our country's power grid, which provides strong backing for the national economy and people's livelihood. The transmission tower system has the characteristics of large span and high flexibility. Under natural conditions such as strong wind, earthquake, frozen rain and snow, the tower is liable to collapse. Coupling with transmission lines makes the dynamic characteristics and wind-induced vibration response of tower system more complicated. The related in-depth research can provide a reference for the design of transmission lines. This paper takes the ZM-11 cat head single loop transmission tower as the background of a practical project undertaken by the research group. The dynamic characteristics and wind-induced vibration response of the tower system are studied. The main contents of this paper include: 1) the basic characteristics of the fluctuating wind speed and the autoregressive model in the linear filtering method are introduced. The steps of simulating the pulsating wind speed time history curve of a given Davenport spectrum with spatial correlation by using MATLAB software are given, and the spectrum obtained by the FFT transformation of the wind speed time history is compared with the target power spectrum. The rationality and validity of the simulation method are verified. On this basis, the time-history curve of wind load is obtained by the transformation between wind speed and wind load. The finite element modeling and dynamic characteristic analysis of transmission tower line system are used to calculate the wind-induced vibration response of transmission tower line system. The research group aims at the typical bolt joints in transmission tower, including single bolt, double bolt, single bolt, double bolt, single bolt, double bolt, single bolt, double bolt, single bolt and double bolt. The axial tensile test of three-bolt joint was carried out, and the corresponding displacement-load curve was obtained. Based on ANSYS, the three-dimensional finite element model of bolt connection was established, and the displacement-load curve was compared with the test results. The displacement-load curve of the bolt connection between the leg of the tower and the leg of the tower is obtained by using the relevant simulation parameters. The displacement-load curve is introduced into the finite element model of the whole tower by using the nonlinear spring element. A finite element model considering bolt slip is established, and the simulation results between the slip model and two traditional finite element models without considering the effect of bolt connection are compared. It is verified that the numerical calculation of the slip model is closer to the experimental results. Based on these three models, the corresponding transmission tower line coupling system is established, including the single-tower two-line system and the two-tower three-wire system. Modal analysis is carried out to study its dynamic characteristics. The effect of bolt slip on the dynamic characteristics of transmission tower and its tower system is presented. The finite element analysis of wind vibration response of transmission tower system is carried out. The time-domain response of transmission tower system under different wind speeds in vertical transmission line direction is investigated. The effects of wind speed, tower line coupling effect and bolt slip on the displacement and acceleration root mean square of wind vibration response of transmission tower are obtained. The effect of bolt slip on the dynamic response of transmission tower system under wind load is studied.
【學位授予單位】：中國科學技術大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75

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