本文選題：單柱拉線塔　切入點(diǎn)：強(qiáng)扭轉(zhuǎn)激勵　出處：《華北電力大學(xué)》2017年碩士論文

【摘要】：不同于自立式輸電塔,特高壓單柱拉線塔的第一階振型為扭轉(zhuǎn)振動。在脫冰或斷線致強(qiáng)扭轉(zhuǎn)激勵作用下,可能使單柱拉線塔產(chǎn)生大幅的扭轉(zhuǎn)振動。因此,脫冰或斷線致強(qiáng)扭轉(zhuǎn)激勵下特高壓單柱拉線塔的動態(tài)響應(yīng)值得研究。本文主要研究內(nèi)容如下:首先,建立了特高壓單柱拉線塔塔線體系簡化有限元模型,通過與全精確有限元模型進(jìn)行模態(tài)分析的對比,證明了所建塔線體系簡化模型的正確性;在塔線體系簡化模型的基礎(chǔ)上建立了塔線體系覆冰有限元模型,通過理論計(jì)算驗(yàn)證了塔線體系覆冰有限元模型的準(zhǔn)確性。其次,通過和文獻(xiàn)中的導(dǎo)線脫冰試驗(yàn)進(jìn)行對比,驗(yàn)證了輸電線脫冰數(shù)值模擬方法的正確性;分析了脫冰致強(qiáng)扭轉(zhuǎn)激勵下特高壓單柱拉線塔動態(tài)響應(yīng)特點(diǎn);研究了改變拉線初應(yīng)力對脫冰致強(qiáng)扭轉(zhuǎn)激勵下單柱拉線塔動態(tài)響應(yīng)的影響。最后,通過和文獻(xiàn)中的導(dǎo)線斷線試驗(yàn)進(jìn)行對比,驗(yàn)證了輸電線斷線數(shù)值模擬方法的正確性;對未覆冰斷導(dǎo)線、覆冰斷導(dǎo)線、覆冰斷地線三種工況下單柱拉線塔的動態(tài)響應(yīng)進(jìn)行了分析。研究結(jié)果表明:在脫冰和斷線致強(qiáng)扭轉(zhuǎn)激勵作用下,單柱拉線塔拉線掛點(diǎn)以上主柱產(chǎn)生了扭轉(zhuǎn)變形,拉線掛點(diǎn)以下主柱產(chǎn)生了隨拉線掛點(diǎn)截面的剛體轉(zhuǎn)動;主柱拉線掛點(diǎn)以上斜材受到的沖擊作用最大;覆冰斷導(dǎo)線工況下單柱拉線塔動態(tài)響應(yīng)大于未覆冰斷導(dǎo)線工況,斷導(dǎo)線工況下單柱拉線塔動態(tài)響應(yīng)大于斷地線工況;本文所研究單檔導(dǎo)線脫冰工況下,單柱拉線塔的變形并不大,主柱主、斜材脫冰峰值應(yīng)力也較小,遠(yuǎn)小于角鋼材料的屈服極限,單柱拉線塔仍非常安全;整相相導(dǎo)線斷線工況下,單柱拉線塔受到的沖擊作用較單檔導(dǎo)線整檔脫冰工況大很多,尤其是主柱拉線掛點(diǎn)以上斜材的峰值應(yīng)力很大,甚至大于主材的峰值應(yīng)力,整相導(dǎo)線斷線工況下拉線掛點(diǎn)以上斜材處于比較危險的狀態(tài)。
[Abstract]:Different from the self-supporting transmission tower, the first mode of UHV single column cable tower is torsional vibration. Under strong torsional excitation caused by deicing or broken wire, the single column cable tower may produce large torsional vibration. The dynamic response of UHV single column tower excited by deicing or broken wire torsion is worth studying. The main contents of this paper are as follows: firstly, a simplified finite element model of UHV single column cable tower system is established. The correctness of the simplified model of the tower line system is proved by comparing the modal analysis with the fully accurate finite element model, and the ice-coated finite element model of the tower line system is established on the basis of the simplified model of the tower line system. The accuracy of the ice-coated finite element model of tower line system is verified by theoretical calculation. Secondly, the correctness of the numerical simulation method of deicing of transmission line is verified by comparing with the wire deicing test in literature. The dynamic response characteristics of UHV single column cable tower under strong torsional excitation induced by deicing are analyzed, and the effect of changing the initial stress of pull wire on the dynamic response of order column cable tower excited by strong torsion induced by deicing is studied. The validity of the numerical simulation method of transmission line breakage is verified by comparing it with the wire breakage test in the literature. The dynamic response of the order column cable tower under three working conditions is analyzed. The results show that under the action of deicing and strong torsional excitation caused by broken wire, the main column above the hanging point of single pillar pull wire Tara line produces torsional deformation. The main column under the cable hanging point produces rigid body rotation with the section of the cable hanging point; the oblique material above the main cable hanging point of the main column receives the greatest impact; the dynamic response of the order column drawing tower issued under the condition of ice-covered broken wire is larger than that of the unfrozen conductor. The dynamic response of the tower is larger than that of the ground wire, the deformation of the tower is not large, and the peak stress of deicing is smaller in the main column. Far less than the yield limit of angle steel material, the single column cable tower is still very safe, and under the condition of the breakage of the phase wire, the impact of the single column cable tower is much greater than that of the single stage wire under the whole deicing condition. Especially, the peak stress of the inclined material above the point of suspension of the main column is very large, even greater than the peak stress of the main material. Under the condition of the breakage of the whole phase wire, the inclined material above the point of the tie wire is in a more dangerous state.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM75

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