本文關(guān)鍵詞：風(fēng)雨致大跨越輸電塔—線體系倒塌破壞機(jī)理研究　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨越輸電塔-線體系 風(fēng)雨速度時(shí)程 動(dòng)力響應(yīng) 倒塌模擬

【摘要】：我國(guó)處于季風(fēng)性氣候區(qū),常出現(xiàn)狂風(fēng)和特大暴雨等強(qiáng)對(duì)流天氣。高聳柔性的大跨越輸電塔-線體系是典型的風(fēng)敏感結(jié)構(gòu),在風(fēng)雨荷載共同作用下大跨越輸電塔-線體系的振動(dòng)疲勞損傷和連續(xù)性倒塌破壞時(shí)有發(fā)生。目前,國(guó)內(nèi)外學(xué)者大多只單獨(dú)考慮風(fēng)荷載對(duì)結(jié)構(gòu)的作用,忽略了雨荷載的影響。為保證輸電線路運(yùn)行的安全性、可靠性和穩(wěn)定性,對(duì)風(fēng)雨致大跨越輸電塔的倒塌破壞機(jī)理研究具有非常重要的現(xiàn)實(shí)意義。本文以某大跨越輸電線路為工程背景,深入研究了風(fēng)雨荷載的作用機(jī)理,模擬生成了風(fēng)雨速度時(shí)程,研究了風(fēng)雨致輸電塔-線體系的倒塌破壞機(jī)理。主要研究?jī)?nèi)容及結(jié)論如下:(1)基于建立的二維穩(wěn)態(tài)風(fēng)場(chǎng),分析了下落中雨滴的高度H、雨滴直徑d、地面粗糙度長(zhǎng)度z0等參數(shù)對(duì)速度比γ的影響規(guī)律,忽略基本風(fēng)速對(duì)速度比的影響,編程實(shí)現(xiàn)了雨滴速度計(jì)算程序,擬合了雨速與風(fēng)速的速度比計(jì)算公式,稱為"公式法",可以方便計(jì)算得到雨滴速度。(2)基于建立的二維紊流風(fēng)場(chǎng),充分考慮雨滴下落過程中脈動(dòng)風(fēng)速和雨滴慣性力等相關(guān)影響因素,基于MATLAB編程實(shí)現(xiàn)了雨滴速度計(jì)算程序,并給出了雨滴速度程序的流程圖,稱為"程序法",為今后數(shù)值模擬風(fēng)雨場(chǎng)提供一種切實(shí)可行的模擬思路。(3)通過公式法和程序法模擬的風(fēng)雨荷載時(shí)程對(duì)大跨越輸電塔進(jìn)行非線性動(dòng)力分析,模擬了大跨越輸電塔在風(fēng)荷載單獨(dú)作用和風(fēng)雨荷載共同作用下的動(dòng)力響應(yīng)。當(dāng)雨強(qiáng)為國(guó)內(nèi)極值709.2 mm/h時(shí),風(fēng)雨荷載共同作用下比風(fēng)荷載作用下的塔頂位移最大值增加了 15.4%。對(duì)于大跨越輸電塔這種結(jié)構(gòu),雨荷載的作用不容忽視。(4)采用合理的倒塌模擬方法及破壞準(zhǔn)則,對(duì)不同風(fēng)攻角下的大跨越輸電塔-線體系進(jìn)行了倒塌模擬,分別研究了風(fēng)雨致大跨越輸電塔-線體系的倒塌破壞全過程、節(jié)間位移角和倒塌破壞機(jī)理。
[Abstract]:In China, strong convective weather such as strong wind and torrential rain often occur in the monsoon climate. The towering flexible long-span transmission tower-line system is a typical wind-sensitive structure. Vibration fatigue damage and continuous collapse of long-span transmission tower / line system occur from time to time under the combined action of wind and rain. At present, most scholars at home and abroad only consider the effect of wind load on the structure. In order to ensure the safety, reliability and stability of transmission line, the effect of rain load is ignored. It is of great practical significance to study the collapse and failure mechanism of wind and rain induced long span transmission tower. In this paper, the mechanism of wind and rain load is deeply studied with a large span transmission line as the engineering background. The wind and rain velocity time history is generated and the collapse and failure mechanism of wind-induced transmission tower-line system is studied. The main contents and conclusions are as follows: 1) based on the established two-dimensional steady wind field. In this paper, the influence law of raindrop height H, raindrop diameter d and roughness length z0 on velocity ratio 緯 is analyzed. The effect of basic wind speed on velocity ratio is ignored, and the program of raindrop velocity calculation is programmed. The formula of velocity ratio between rain velocity and wind speed is fitted, which is called "formula method", which can be used to calculate the velocity of raindrop. Considering the influence factors such as the pulsating wind speed and the droplet inertia force in the falling process of raindrop, the program of raindrop velocity calculation based on MATLAB is realized, and the flow chart of the program is given. Called "procedure method", it provides a feasible simulation idea for numerical simulation of wind and rain field in the future. The nonlinear dynamic analysis of long span transmission tower is carried out by the wind and rain load time history simulated by formula method and procedure method. The dynamic response of long span transmission tower under wind load alone and wind and rain load is simulated. When the rain intensity is the domestic extreme value of 709.2 mm/h. Compared with the maximum displacement of tower under wind load, the maximum displacement of tower under wind and rain loads is increased by 15.4. for long-span transmission tower, this kind of structure. The effect of rain load can not be ignored. (4) using reasonable collapse simulation method and failure criterion, the collapse simulation of large-span transmission tower and line system with different wind attack angle is carried out. The whole process of collapse and failure, Internode displacement angle and collapse failure mechanism of large span transmission tower-line system induced by wind and rain are studied respectively.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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