【摘要】：我國沿海地區(qū)經(jīng)常遭受臺風(fēng)等惡劣天氣的侵襲。作為電能輸送的重要載體,架空輸電線路安全可靠運(yùn)行對沿海地區(qū)的發(fā)展具有十分重大的作用。然而架空輸電線路具有高柔、輕質(zhì)、小阻尼特性,對風(fēng)載荷具有很強(qiáng)的敏感性,難以逃脫臺風(fēng)這種強(qiáng)風(fēng)載荷的侵襲,給當(dāng)?shù)氐慕?jīng)濟(jì)建設(shè)和發(fā)展造成了巨大的損失。從當(dāng)前輸電線路的抗風(fēng)設(shè)計來看,對于沿海輸電線路,大都按照滿應(yīng)力計算規(guī)則,對于臺風(fēng)這種高強(qiáng)度高湍流的風(fēng)載荷,采用放大系數(shù)的方法,進(jìn)行靜風(fēng)等效作用分析,卻忽略了臺風(fēng)高湍流帶來的強(qiáng)脈動特性。為了研究輸電塔線體系在臺風(fēng)風(fēng)載荷作用下的動力響應(yīng),本文從以下幾點(diǎn)展開了研究:首先選取了YanMeng臺風(fēng)風(fēng)場作為臺風(fēng)平均風(fēng)的模擬模型,并結(jié)合相關(guān)資料,對“威馬遜”臺風(fēng)進(jìn)行反演,確定模型參數(shù),驗證YanMeng臺風(fēng)風(fēng)場的適應(yīng)性;隨后采用模擬圓法,結(jié)合近50年來登陸海南省的熱帶氣旋資料,對熱帶氣旋的關(guān)鍵參數(shù)進(jìn)行了概率統(tǒng)計分析,并采用Monte Carlo模擬方法,結(jié)合YanMeng臺風(fēng)風(fēng)場,推算了海口市的極值風(fēng)速,給出了一種利用熱帶氣旋資料計算極值風(fēng)速的方法。其次介紹臺風(fēng)脈動風(fēng)的相關(guān)特性,并以海南省海口市2014年“威馬遜”臺風(fēng)對當(dāng)?shù)匾换?10kV貓頭塔造成的倒塔事故為工程背景,在ANSYS中建立了一塔兩線的輸電塔線體系,采用石沅臺風(fēng)風(fēng)譜模擬了該輸電塔線體系工程環(huán)境下的脈動風(fēng)風(fēng)速。最后在ANSYS中進(jìn)行了臺風(fēng)作用下的輸電塔線體系風(fēng)致動力響應(yīng)分析,對比研究了在不同風(fēng)載荷作用模式下的輸電塔線體系風(fēng)載荷效應(yīng)和對應(yīng)的線條風(fēng)對主材軸力的貢獻(xiàn)率以及臺風(fēng)風(fēng)載荷作用下的脈動放大作用;并從主材受壓穩(wěn)定角度,對背風(fēng)側(cè)主材軸向壓力值進(jìn)行了校驗,研究表明,考慮脈動風(fēng)放大作用后,主材軸向壓力遠(yuǎn)超過了設(shè)計值,并極有可能導(dǎo)致主材受壓失穩(wěn)而發(fā)生倒塔事故。
[Abstract]:The coastal areas of our country are often affected by severe weather, such as typhoons. As an important carrier of power transmission, the safe and reliable operation of overhead transmission lines plays a very important role in the development of coastal areas. However, overhead transmission lines have the characteristics of high flexibility, light weight and small damping, and have strong sensitivity to wind load. It is difficult to escape typhoon, which has caused huge losses to local economic construction and development. From the wind resistance design of the current transmission lines, for coastal transmission lines, most of them are based on the rule of full stress calculation, and for typhoon, which is a high intensity and high turbulence wind load, the equivalent static wind action is analyzed by using the method of magnifying factor. However, the strong pulsation caused by typhoon high turbulence is ignored. In order to study the dynamic response of transmission tower system under typhoon wind load, this paper studies the following aspects: firstly, YanMeng typhoon wind field is selected as the simulation model of typhoon mean wind, and relevant data are combined. The model parameters are determined to verify the adaptability of YanMeng typhoon wind field, and then the simulation circle method is used to combine the tropical cyclone data of Hainan Province in the past 50 years. The probabilistic and statistical analysis of the key parameters of tropical cyclone is carried out, and the extreme wind speed of Haikou City is calculated by using Monte Carlo simulation method and YanMeng typhoon wind field, and a method of calculating extreme wind speed based on tropical cyclone data is given. Secondly, this paper introduces the characteristics of typhoon pulsation wind, and takes the accident of inverted tower caused by 2014 "Weimasun" typhoon in Haikou City, Hainan Province, as the engineering background, and establishes a transmission tower system with one tower and two lines in ANSYS. The fluctuating wind speed of the transmission tower system engineering environment is simulated by the wind spectrum of Typhoon Shiyuan. Finally, the wind-induced dynamic response of transmission tower system under typhoon is analyzed in ANSYS. The wind load effect of transmission tower system under different wind load modes and the contribution rate of the corresponding line wind to the axial force of the main material and the pulsation amplification under the typhoon wind load are compared and studied, and from the point of view of the stability of the main material under compression, the wind load effect of the transmission tower system and the corresponding contribution rate of the line wind to the axial force of the main material are studied. The axial pressure of the main material on the leeward side is verified. The results show that the axial pressure of the main material exceeds the design value after considering the effect of pulsating wind amplification, and it is very likely that the collapse tower accident will occur due to the instability of the main material under compression.
【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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