本文關(guān)鍵詞：覆冰荷載下500kV輸電塔架的力學(xué)性能研究　出處：《內(nèi)蒙古科技大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 輸電塔架 覆冰荷載 斷線(xiàn)張力 輸電塔-線(xiàn)體系

【摘要】：近年來(lái)，我國(guó)南方地區(qū)的冰凍災(zāi)害頻發(fā)，使輸電線(xiàn)路嚴(yán)重破壞，給經(jīng)濟(jì)發(fā)展造成了不可估量的損失。為降低冰凍災(zāi)害下輸電塔發(fā)生倒塌的概率，保障輸電線(xiàn)路的暢通運(yùn)行，研究覆冰荷載下輸電塔及輸電塔-線(xiàn)體系的力學(xué)性能具有重要的意義。 本文以500kV線(xiàn)路DFZ1貓頭型直線(xiàn)塔為研究對(duì)象，采用等效密度法來(lái)模擬覆冰荷載，通過(guò)建立輸電塔和“雙塔三線(xiàn)”輸電塔-線(xiàn)體系的有限元分析模型，研究了不同覆冰厚度、不同工況下輸電塔的靜力性能及其動(dòng)力特性的變化情況，并通過(guò)考慮幾何初始缺陷和材料非線(xiàn)性，得到了覆冰荷載對(duì)其承載能力的影響規(guī)律；分析了不同覆冰厚度、不同工況下輸電塔-線(xiàn)體系的靜力性能，并對(duì)相同檔距與不同檔距、同高程與不同高程的輸電塔-線(xiàn)體系的受力特征進(jìn)行了對(duì)比。 結(jié)果表明：隨著覆冰厚度的增加，輸電塔桿件的應(yīng)力呈增大趨勢(shì)，而塔頂位移則隨之減�。惠旊娝诔惺軣o(wú)偏心荷載時(shí)的屈服荷載最大，在承受偏心荷載且扭轉(zhuǎn)變形較小時(shí)的屈服荷載次之，承受扭轉(zhuǎn)荷載時(shí)的屈服荷載最��；輸電塔的頻率及第一階陣型的控制點(diǎn)的數(shù)值隨覆冰荷載的增加而減小，頻率的最大降幅達(dá)到32.6%；覆冰厚度的增加會(huì)導(dǎo)致輸電塔的破壞形式由整體破壞轉(zhuǎn)變?yōu)榫植科茐模茐奈恢糜伤任恢弥饾u上移至導(dǎo)地線(xiàn)懸掛點(diǎn)位置，覆冰輸電塔的屈服荷載亦隨之有不同程度的降低，最大降幅達(dá)22.7%；輸電塔的抗扭能力隨覆冰厚度的增加而提高。在輸電塔-線(xiàn)體系中，在相同檔距內(nèi)出現(xiàn)導(dǎo)地線(xiàn)覆冰增加時(shí)，輸電塔發(fā)生向靠近重冰檔一側(cè)的彎曲變形，，且應(yīng)力增長(zhǎng)較快，遠(yuǎn)離一側(cè)的應(yīng)力增長(zhǎng)較慢；在不同檔距中出現(xiàn)導(dǎo)地線(xiàn)覆冰增加時(shí)，與檔距相同的輸電塔架相比，檔距不同覆冰輸電塔的應(yīng)力和彎曲變形更大；在不同高程內(nèi)，當(dāng)?shù)透叱虒?dǎo)地線(xiàn)覆冰荷載增大時(shí)，輸電塔的應(yīng)力增長(zhǎng)大于同高程輸電塔的應(yīng)力的增長(zhǎng)；當(dāng)中間高程導(dǎo)地線(xiàn)覆冰荷載增大時(shí)，輸電塔的應(yīng)力增長(zhǎng)與塔頂位移均大于同高程的增長(zhǎng)。 本文研究成果可為覆冰下輸電塔架的可靠性研究提供理論依據(jù)，為輸電塔設(shè)計(jì)規(guī)范的修訂提供一定的理論支撐。
[Abstract]:In recent years, the southern region of China's frozen disasters, serious damage to the transmission line, causing immeasurable losses to the economic development. In order to reduce the probability of freezing disaster collapsed tower of power transmission, to ensure smooth operation of the transmission line, has important significance on mechanical properties of transmission tower and transmission tower line system of ice load next.
In this paper, 500kV DFZ1 cat head straight line tower as the research object, to simulate the ice load by using the equivalent density method, by establishing a finite element transmission tower and Twin Towers three line transmission tower line system analysis model of different ice thickness, the change of performance and dynamic characteristics of static force transmission tower under different conditions next, by considering the initial geometric imperfections and material nonlinearity, and obtains the influence law of ice load on the bearing capacity; different ice thickness is analyzed, the static performance of transmission tower line system under different working conditions, and the same distance and different gear span, compared with elevation and different elevation transmission tower line system of the force characteristics.
The results showed that with the increase of ice thickness, increases the stress of transmission tower members, while the top displacement decreases; the transmission tower under eccentric load when no yield load, under eccentric load and torsional deformation of low yield load time, under torsional load when the minimum yield load numerical control; transmission tower frequency and the first order formation decreases with the increasing of ice load, the biggest drop in frequency reached 32.6%; increase the ice thickness will lead to damage in the form of transmission tower by the overall destruction into the local damage, damage location by location is gradually moved to the tower leg wire hanging point the position, the yield load of icing transmission tower will have different degrees of reduction, the largest decline of 22.7%; transmission tower torsional capacity increased with the increase of ice thickness. In the transmission tower line system, in which With the wire icing in the span increases, the transmission tower to the bending deformation of heavy ice close to the side of the file, and the stress of rapid growth, away from the side of the stress of slower growth; appear in different spans in wire icing is increased, compared to the same transmission tower and span, stress and bending deformation. From the different icing transmission tower more; in different elevation, when low elevation guide wire increases ice load, transmission tower stress growth greater than the same elevation transmission tower stress increases; when the middle elevation guide wire increases ice load, transmission tower stress and displacement are top growth more than the same height growth.
The results of this study can provide a theoretical basis for the reliability study of transmission tower under ice cover, and provide some theoretical support for the revision of the design specification for transmission tower.

【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU347

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