本文選題：輸電塔架　切入點：靜力特性　出處：《東北石油大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著電網(wǎng)的不斷升級，輸電線路作為電網(wǎng)的大動脈，其安全穩(wěn)定的運行關(guān)乎著國民經(jīng)濟的穩(wěn)定。而輸電塔架作為支持輸電線路的空間結(jié)構(gòu)，它的安全可靠的運行是電網(wǎng)穩(wěn)定運行的重要保證。由于自然環(huán)境的日益惡化，極端天氣的不斷出現(xiàn)，輸電塔架在極端惡劣的環(huán)境下能否保持正常的工作狀態(tài)受到大家的廣泛關(guān)注。因此，研究輸電塔架在各種復雜極端情況下的靜動力特性對提高輸電線路的安全可靠性有著重要的研究以及工程價值。 本文以有限軟軟件ANSYS15.0為研究平臺，根據(jù)已有的研究以及設(shè)計資料，研究了輸電塔架的有限元模型的建立方法，建立了ZB1酒杯型直線塔的有限元分析模型，并提出了塔架在風載荷、覆冰載荷、基礎(chǔ)沉降等工況下的研究處理辦法。 以ZB1直線塔為例根據(jù)設(shè)計規(guī)程，通過分析計算得出了輸電塔架在大風作用下的風載荷，并分段施加在輸電塔架以實現(xiàn)風載荷的準確施加。此外，本文通過模擬分析得到了輸電塔架在風載荷作用下桿件的位移以及軸力分布情況，提出了輸電塔架在風載荷的作用下可忽略輸電線重量對輸電塔架分析結(jié)果的影響。 然后研究了輸電塔架在覆冰、基礎(chǔ)沉降等工況下的靜力學特性。在覆冰均勻的情況下，在輸電線上施加瞬時節(jié)點力來模擬覆冰過程，研究了輸電塔架在不同冰厚時的靜力響應(yīng)。接下來研究了輸電塔架在基礎(chǔ)不均勻沉降的工況下的內(nèi)力變化，模擬分析了輸電塔架模型在沉降量為60mm時的桿件受力情況，得到了桿件應(yīng)力與沉降量的變化曲線圖，提出了在塔身底部放置加強板來預(yù)防和解決沉降量過大對輸電塔架強度的影響。 最后著重研究了ZB1輸電塔架的動力特性，對有限元模型進行了模態(tài)分析，得到了輸電塔架的前10階振型以及相對應(yīng)的自振頻率，，通過研究發(fā)現(xiàn)在塔腿和塔身部分容易過早的出現(xiàn)局部模態(tài)，通過對比分析在輸電塔架上增加橫隔面的方式提高了輸電塔架的強度；對輸電塔架有限元模型運用Davenport風速功率譜進行了脈動風動力分析。
[Abstract]:With the continuous upgrading of the power grid, transmission lines as the main artery of the grid, its safe and stable operation is related to the stability of the national economy, and the transmission tower as a spatial structure to support the transmission lines. Its safe and reliable operation is an important guarantee for the stable operation of the power grid. Due to the worsening of the natural environment and the continuous appearance of extreme weather, Whether the transmission tower can maintain the normal working condition in the extremely bad environment has attracted wide attention. It is important to study the static and dynamic characteristics of transmission towers in various complex extreme cases to improve the safety and reliability of transmission lines. Based on the finite software ANSYS15.0, based on the existing research and design data, the finite element model of transmission tower is studied in this paper, and the finite element analysis model of ZB1 wine cup straight line tower is established. The research and treatment methods of tower under wind load, icing load and foundation settlement are put forward. Taking the ZB1 linear tower as an example, according to the design code, the wind load of transmission tower under the action of high wind is obtained through analysis and calculation, and the wind load is applied to the transmission tower by stages. In addition, In this paper, the displacement and axial force distribution of the transmission tower members under wind load are obtained by simulation analysis, and the influence of transmission line weight on the transmission tower analysis results is proposed. Then the static characteristics of transmission tower under icing and foundation settlement are studied. In the case of uniform icing, the transient node force is applied on the transmission line to simulate the icing process. The static response of transmission tower under different ice thickness is studied. Then, the change of internal force of transmission tower under the condition of uneven settlement of foundation is studied, and the stress of transmission tower model is simulated and analyzed when the settlement is 60 mm. The curves of stress and settlement of members are obtained, and the influence of excessive settlement on the strength of transmission tower is prevented and solved by placing stiffening plates at the bottom of tower. Finally, the dynamic characteristics of the ZB1 transmission tower are studied, and the modal analysis of the finite element model is carried out. The first 10 vibration modes and the corresponding natural frequencies of the transmission tower are obtained. It is found that the local modes appear prematurely in the tower legs and the tower body, and the strength of the transmission tower is improved by comparing and analyzing the way of adding the transverse plane to the transmission tower. The finite element model of transmission tower is analyzed by Davenport wind power spectrum.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM753

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