【摘要】：輸電塔結(jié)構(gòu)是一個(gè)國家生命線工程的重要組成部分，風(fēng)荷載是其主要的設(shè)計(jì)荷載。近年來因風(fēng)荷載造成的輸電塔倒塌事故多次出現(xiàn)，不僅對(duì)人民的生產(chǎn)生活造成極大的影響，還可能導(dǎo)致其他比較嚴(yán)重的次生災(zāi)害。因此，對(duì)輸電塔結(jié)構(gòu)進(jìn)行風(fēng)振疲勞分析有著重要的現(xiàn)實(shí)工程意義。本文以龍開口500kV送出輸電工程中呼高為45m的酒杯型輸電塔為研究背景，詳細(xì)地介紹了基于累積損傷理論和概率斷裂力學(xué)理論的結(jié)構(gòu)風(fēng)振疲勞分析。 首先本文基于疲勞累計(jì)損傷理論，介紹了輸電塔結(jié)構(gòu)的風(fēng)致疲勞時(shí)域分析方法，估算了結(jié)構(gòu)的疲勞壽命。內(nèi)容主要包括輸電塔結(jié)構(gòu)的有限元模型建立方法以及在隨機(jī)風(fēng)荷載作用下的了風(fēng)振響應(yīng)計(jì)算；并假定某風(fēng)向上不同平均風(fēng)速出現(xiàn)的概率服從Weibull分布，以考慮風(fēng)向風(fēng)速分布對(duì)結(jié)構(gòu)疲勞累積損傷的影響。為減少計(jì)算機(jī)的計(jì)算量，本文運(yùn)用材料力學(xué)知識(shí)提出了計(jì)算L型截面的應(yīng)力分布的簡化方法。 然后采用基于斷裂力學(xué)的疲勞裂紋擴(kuò)展模型對(duì)結(jié)構(gòu)進(jìn)行疲勞分析，而應(yīng)力強(qiáng)度因子是一個(gè)重要的基本概念，反映了裂紋尖端附近應(yīng)力場強(qiáng)弱。本文第三章主要介紹了三維表面裂紋有限元模型的建立和裂紋尖端處應(yīng)力強(qiáng)度因子的求解方法，并將計(jì)算結(jié)果和NewmanRaju經(jīng)驗(yàn)公式進(jìn)行了對(duì)比，，以驗(yàn)證數(shù)值模擬的可行性和可靠性；并在此基礎(chǔ)上提出了復(fù)合裂紋的應(yīng)力強(qiáng)度因子的近似計(jì)算方法。 最后本文在第四章采用概率斷裂力學(xué)理論研究結(jié)構(gòu)的疲勞問題并考慮了材料裂紋擴(kuò)展速率的隨機(jī)性分散性�；谄诹鸭y擴(kuò)展理論和Paris公式，本章推導(dǎo)了恒幅荷載作用下結(jié)構(gòu)的疲勞壽命估算公式，并通過引入一個(gè)平穩(wěn)的對(duì)數(shù)正態(tài)隨機(jī)過程獲得隨機(jī)裂紋擴(kuò)展模型。
[Abstract]:Transmission tower structure is an important part of a national lifeline project, and wind load is its main design load. In recent years, the collapse of transmission tower caused by wind load has occurred many times, which not only has a great impact on the production and life of the people, but also may lead to other serious secondary disasters. Therefore, it is of great practical engineering significance to analyze the wind-induced vibration fatigue of transmission tower structure. In this paper, the wind-induced vibration fatigue analysis of the structure based on cumulative damage theory and probabilistic fracture mechanics theory is introduced in detail based on the research background of the wine glass transmission tower with 45m exhalation height in the transmission project sent out by long mouth 500kV. Firstly, based on the fatigue cumulative damage theory, the time domain analysis method of wind-induced fatigue of transmission tower structure is introduced, and the fatigue life of the structure is estimated. The content mainly includes the finite element model establishment method of transmission tower structure and the calculation of wind-induced vibration response under random wind load. It is assumed that the probability of different average wind speed in a certain wind direction obeys the Weibull distribution in order to consider the influence of wind direction and wind speed distribution on the fatigue cumulative damage of the structure. In order to reduce the computational complexity of computer, a simplified method for calculating the stress distribution of L-section is proposed by using the knowledge of material mechanics. Then the fatigue crack propagation model based on fracture mechanics is used to analyze the fatigue of the structure, and the stress intensity factor is an important basic concept, which reflects the stress field near the crack tip. In the third chapter, the establishment of three-dimensional surface crack finite element model and the solution method of stress intensity factor at crack tip are introduced, and the calculated results are compared with NewmanRaju empirical formula to verify the feasibility and reliability of numerical simulation. On this basis, an approximate calculation method of stress intensity factor of composite crack is put forward. Finally, in the fourth chapter, the fatigue problem of the structure is studied by using the probabilistic fracture mechanics theory, and the random dispersion of the crack growth rate of the material is considered. Based on the fatigue crack growth theory and Paris formula, the fatigue life estimation formula of the structure under constant amplitude load is derived in this chapter, and the random crack propagation model is obtained by introducing a stationary lognormal stochastic process.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU347;TU312

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