【摘要】：輸電塔是電網(wǎng)的重要結(jié)構(gòu),其承載安全性及經(jīng)濟(jì)性與電力運(yùn)營安全及其社會影響密切相關(guān)。因而,開展輸電塔承載力設(shè)計與優(yōu)化研究,具有重要的社會意義及經(jīng)濟(jì)價值。本文在結(jié)構(gòu)承載力分析的彈性模量縮減法(Elastic Modulus Reduction Method,簡記為EMRM)基礎(chǔ)上,圍繞輸電塔結(jié)構(gòu)的兩層面承載力分析設(shè)計與優(yōu)化,開展了以下研究工作：(1)研究建立了輸電塔結(jié)構(gòu)常用薄壁構(gòu)件的齊次化廣義屈服函數(shù)。針對輸電塔結(jié)構(gòu)常用的圓管和角鋼構(gòu)件,通過回歸分析和最小二乘法建立了薄壁構(gòu)件截面的齊次廣義屈服函數(shù),通過誤差分析確定了其最高階次,為廣義屈服函數(shù)引入極限分析的彈性模量調(diào)整法奠定了理論基礎(chǔ)。(2)研究建立了輸電塔結(jié)構(gòu)極限承載力分析的彈性模量縮減法(EMRM)。引入圓管和角鋼構(gòu)件的齊次化廣義屈服函數(shù),定義了構(gòu)件的單元承載比,依據(jù)承載比均勻度建立了彈性模量調(diào)整的動態(tài)閾值,并根據(jù)變形能守恒原則建立了彈性模量調(diào)整策略,提出了輸電塔結(jié)構(gòu)極限承載力分析的EMRM,克服了傳統(tǒng)彈性模量調(diào)整法因不滿足比例條件所導(dǎo)致的計算精度和穩(wěn)定性不良問題。(3)研究提出了輸電塔結(jié)構(gòu)的兩層面承載力分析與設(shè)計方法。引入輸電塔結(jié)構(gòu)極限承載力分析的EMRM,采用單元承載比定義了構(gòu)件承載比,根據(jù)構(gòu)件承載比迭代過程確定了高、低承載構(gòu)件的判別準(zhǔn)則,并利用首步和末步迭代分析結(jié)果求解構(gòu)件安全系數(shù)和結(jié)構(gòu)整體安全系數(shù),根據(jù)截面強(qiáng)度和安全系數(shù)之間的正比例關(guān)系,按照預(yù)定的結(jié)構(gòu)整體安全系數(shù)確定高承載構(gòu)件的截面強(qiáng)度,使輸電塔結(jié)構(gòu)同時在構(gòu)件和整體兩個層面上滿足承載安全要求,從而為定量設(shè)計輸電塔結(jié)構(gòu)整體承載力提供了良好的方法。(4)研究提出了輸電塔結(jié)構(gòu)的兩層面承載力優(yōu)化方法。以輸電塔結(jié)構(gòu)兩層面承載力安全要求為主要約束條件,以均勻承載,即最大化結(jié)構(gòu)承載比均勻度為優(yōu)化目標(biāo),根據(jù)構(gòu)件截面強(qiáng)度與構(gòu)件承載比的反比例關(guān)系,建立了低承載構(gòu)件截面強(qiáng)度的優(yōu)化調(diào)整策略,提出了輸電塔結(jié)構(gòu)兩層面優(yōu)化設(shè)計方法,能提供承載安全性能和經(jīng)濟(jì)性能均優(yōu)的結(jié)構(gòu)設(shè)計方案。該優(yōu)化方法不僅解決了結(jié)構(gòu)整體承載力優(yōu)化設(shè)計的難題,而且能夠與傳統(tǒng)的結(jié)構(gòu)設(shè)計方法相融合。
[Abstract]:Transmission tower is an important structure of power grid. Its bearing safety and economy are closely related to power operation safety and its social impact. Therefore, carrying capacity design and optimization research of transmission tower has important social significance and economic value. On the basis of Elastic Modulus reduction method (EMRM), this paper analyzes and optimizes the two-layer bearing capacity of transmission tower structure. The following research works are carried out: (1) the homogeneous generalized yield function of thin-walled members of transmission tower structures is established. The homogeneous generalized yield function of thin-walled members is established by regression analysis and least square method, and the highest order is determined by error analysis. It lays a theoretical foundation for introducing the elastic modulus adjustment method into the limit analysis of the generalized yield function. (2) the elastic modulus reduction method (EMRM) for the analysis of the ultimate bearing capacity of transmission tower structures is established. In this paper, the homogeneous generalized yield function of circular tube and angle steel member is introduced, and the unit bearing ratio is defined, the dynamic threshold of elastic modulus adjustment is established according to the uniformity of bearing ratio, and the adjustment strategy of elastic modulus is established according to the principle of conservation of deformation energy. In this paper, EMRM for the ultimate bearing capacity analysis of transmission tower structure is proposed, which overcomes the problem of poor calculation accuracy and stability caused by the traditional elastic modulus adjustment method which does not meet the proportional condition. (3) the two-layer bearing capacity of the transmission tower structure is studied. Force analysis and design method. In this paper, EMRM is introduced to analyze the ultimate bearing capacity of transmission tower structure, and the element bearing ratio is used to define the component bearing ratio. According to the iterative process of the component bearing ratio, the criterion of high and low bearing member is determined. The first and last step iterative analysis results are used to solve the safety factor of the component and the overall safety factor of the structure, according to the positive ratio between the section strength and the safety factor, According to the predetermined overall safety factor of the structure, the section strength of the high bearing member is determined, so that the transmission tower structure can meet the bearing safety requirements both on the member level and on the whole level. It provides a good method for quantitative design of the overall bearing capacity of transmission tower structure. (4) the optimization method of two-layer bearing capacity of transmission tower structure is proposed. Taking the safety requirement of the two-layer bearing capacity of transmission tower structure as the main constraint condition, and taking the uniform bearing capacity, that is, maximizing the uniformity of the bearing ratio of the structure as the optimization objective, according to the inverse proportion relationship between the section strength of the member and the bearing ratio of the member. The optimal adjustment strategy of the cross-section strength of the low bearing member is established, and the two-layer optimization design method of the transmission tower structure is proposed, which can provide the structural design scheme with both the safety and economic performance of the transmission tower. This optimization method not only solves the problem of structural overall bearing capacity optimization design, but also can be integrated with the traditional structural design method.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU347;TU312.1

【引證文獻(xiàn)】

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本文編號：2136323