本文選題：樁-土-輸電塔耦合體系 + 模態(tài)分析�。� 參考：《東北電力大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟的高度發(fā)展和煤炭、石油等一次能源的緊缺,電力作為清潔的二次能源將逐漸成為主要的能源消費方式。國家電網(wǎng)公司提出建設(shè)全球能源互聯(lián)網(wǎng),而實現(xiàn)全球能源互聯(lián)的第一步就是建設(shè)特高壓電網(wǎng),長距離、大跨越電力輸送已成為常態(tài)。通常,在進行輸電塔的設(shè)計時主要考慮風(fēng)荷載的作用,但近年來地震荷載作用下輸電塔發(fā)生破壞的例子屢見不鮮。調(diào)查表明,當(dāng)輸電塔發(fā)生震害時,大多可見基礎(chǔ)及場地土的嚴(yán)重破壞。因此,開展土-上部結(jié)構(gòu)相互作用對輸電塔動力特性影響的工作是十分必要的。本文研究內(nèi)容主要由以下三個部分組成:(1)在四種不同的場地條件下建立了四個考慮樁-土-上部結(jié)構(gòu)相互作用的輸電塔的有限元模型;在剛性地基條件下,建立一個輸電塔的有限元模型。首先對這五個模型進行了模態(tài)分析,并對比它們之間周期和振型的特點,得出考慮相互作用后,輸電塔的周期延長,振型滯后。其次,運用時程分析的方法分別對考慮相互作用的四個模型和剛性地基條件下輸電塔的模型進行地震響應(yīng)分析。對比計算結(jié)果得出,在軟土和中軟土場地條件下,樁-土-結(jié)構(gòu)相互作用對結(jié)構(gòu)的動力響應(yīng)產(chǎn)生不利影響。(2)在軟土場地條件下,建立四個橫隔數(shù)目不一樣的樁-土-輸電塔整體有限元模型。分別對四個模型進行模態(tài)分析,并分別對比他們周期的特點,得出隨著橫隔數(shù)目的增加結(jié)構(gòu)的周期變小。然后分別對四個模型進行地震響應(yīng)分析,研究發(fā)現(xiàn)增加輸電塔的橫隔后,有效的減小了塔頂?shù)奈灰品逯岛图铀俣确逯?但是輸電塔根部最大軸力和基底最大剪力有所增大。因此并不是橫隔數(shù)目越多,輸電塔的抗震性能越好。(3)在軟土場地條件下,建立三個樁長不一樣的樁-土-輸電塔的整體有限元模型。分別對三個模型進行模態(tài)分析,樁長變長后結(jié)構(gòu)的剛度變大,周期變小。對三個樁長不同的模型進行動力時程響應(yīng)分析,研究發(fā)現(xiàn)樁長增加后塔頂?shù)奈灰坪图铀俣葴p小,但是塔根部最大軸力和基底剪力增大。因此在工程實際中要根據(jù)現(xiàn)場土體條件合理選擇樁的長度,并不是樁長度越長,上部結(jié)構(gòu)抗震性能越好。
[Abstract]:With the development of economy and the shortage of primary energy, such as coal and oil, electric power, as a clean secondary energy, will gradually become the main way of energy consumption. The State Grid Corporation has proposed the construction of the global energy Internet, and the first step to realize global energy interconnection is to build an ultra-high voltage power grid. Long distance and long span power transmission has become the norm. Usually, the wind load is the main consideration in the design of transmission tower, but in recent years, there are many examples of transmission tower failure under earthquake load. The investigation shows that when the transmission tower is damaged by earthquake, the foundation and site soil are damaged seriously. Therefore, it is necessary to study the effect of soil-superstructure interaction on the dynamic characteristics of transmission towers. This paper mainly consists of the following three parts: (1) the finite element model of four transmission towers considering pile-soil-superstructure interaction is established under four different site conditions; A finite element model of transmission tower is established. First, the modal analysis of the five models is carried out, and the characteristics of the periods and modes between them are compared. After considering the interaction, the period of the transmission tower is prolonged and the mode is delayed. Secondly, the seismic response of four models considering interaction and the model of transmission tower with rigid foundation are analyzed by time-history analysis method. The results show that the pile-soil-structure interaction has a negative effect on the dynamic response of the structure under the soft soil and medium soft soil conditions. (2) under the soft soil site condition, the pile-soil-structure interaction has a negative effect on the dynamic response of the structure. Four finite element models of pile-soil-transmission tower with different number of transverses are established. The modal analysis of the four models and the characteristics of their periods respectively show that the period of the structure becomes smaller with the increase of the number of transverses. Then the seismic responses of the four models are analyzed respectively. It is found that the peak displacement and acceleration of the tower are reduced effectively after the increase of the transect, but the maximum axial force at the base and the maximum axial force at the base of the transmission tower are increased. Therefore, the more the number of horizontal separation, the better the seismic performance of transmission tower. (3) under the condition of soft soil site, the integral finite element model of three pile-soil-transmission towers with different pile length is established. Modal analysis of the three models shows that the stiffness of the structure becomes larger and the period of the pile becomes smaller after the length of the pile becomes longer. The dynamic time-history response analysis of three models with different pile lengths shows that the displacement and acceleration of the tower top decrease with the increase of pile length, but the maximum axial force and the base shear force increase at the root of the tower. Therefore, the length of pile should be reasonably selected according to the condition of soil in the field in engineering practice. The longer the length of pile is, the better the seismic performance of superstructure is.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM753

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本文編號：2113981