本文選題：懸索橋 + 吊索�。� 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：懸索橋是大跨度橋梁的橋型之一,而懸索橋吊索作為主要傳力構(gòu)件,容易經(jīng)受周圍環(huán)境、溫度的影響而發(fā)生性能的改變,懸索橋吊索在使用階段承受汽車以及風(fēng)等動荷載作用,容易產(chǎn)生疲勞問題,然而國內(nèi)對于懸索橋吊索鋼絲繩內(nèi)部鋼絲應(yīng)力和疲勞相關(guān)理論分析較少。論文主要針對上述問題對以下內(nèi)容進行了探討：1.鋼絲繩內(nèi)部鋼絲應(yīng)力分析根據(jù)Costello總結(jié)的相關(guān)鋼絲繩內(nèi)部鋼絲受力基本原理,推導(dǎo)了簡單構(gòu)造鋼絲繩內(nèi)部鋼絲應(yīng)力計算公式并編制程序,并進一步將簡單構(gòu)造鋼絲繩內(nèi)部鋼絲應(yīng)力的計算理論擴展到多層多股鋼絲繩內(nèi)部鋼絲應(yīng)力計算中,使各種構(gòu)造鋼絲繩內(nèi)部鋼絲應(yīng)力有較為精確的定量分析。2.建立鋼絲繩空間幾何模型以及有限元模型得到了鋼絲繩在直立和彎曲狀態(tài)時各根鋼絲中心軸線數(shù)學(xué)方程,根據(jù)相應(yīng)幾何關(guān)系建立了鋼絲繩幾何空間模型以及有限元模型,并討論了鋼絲繩有限元模型分析時需要注意的問題,此外根據(jù)簡單構(gòu)造鋼絲繩有限元模型對理論計算值進行了驗證。3.根據(jù)理論計算公式驗算吊索疲勞強度根據(jù)我國鐵路橋梁疲勞檢算的設(shè)計規(guī)范和標(biāo)準(zhǔn)得出相應(yīng)的疲勞荷載布載方式,運用橋梁結(jié)構(gòu)非線性分析系統(tǒng)BNLAS計算得出各吊索相應(yīng)荷載值。結(jié)合吊索疲勞荷載值,利用理論推導(dǎo)公式對鋼絲繩內(nèi)部鋼絲各處疲勞最不利點進行了疲勞驗算,根據(jù)相關(guān)理論獲得了鋼絲抗疲勞強度并驗算了鋼絲繩吊索的疲勞強度。研究得出：各種構(gòu)造的鋼絲繩能夠使用本文推導(dǎo)的公式進行鋼絲繩內(nèi)部鋼絲的應(yīng)力計算,能取得較好的應(yīng)力分析結(jié)果。計算分析發(fā)現(xiàn)鋼絲繩在經(jīng)受彎矩作用時內(nèi)部中心鋼絲受力最大,外部螺旋鋼絲可通過相應(yīng)的變形比例換算系數(shù)計算相應(yīng)內(nèi)力。鋼絲繩有限元模型建立時,鋼絲之間容易產(chǎn)生由于變形而導(dǎo)致鋼絲重疊問題,采用數(shù)學(xué)建模的方式能夠較好地解決這個問題。吊索鋼絲繩的疲勞問題在吊索騎跨索夾處非常突出,在直立吊索段及錨固處的疲勞問題較為緩和。
[Abstract]:Suspension bridge is one of the bridge types of long-span bridges, and suspension bridge sling as the main force transmission component, it is easy to withstand the surrounding environment, the influence of temperature and the change of performance. The suspension bridge hanger is subjected to the dynamic load of automobile and wind in the use stage, and it is easy to produce fatigue problems. However, the internal steel wire rope steel rope steel wire rope in China is used. The analysis of the theory of wire stress and fatigue is less. The following contents are discussed in this paper. 1. the stress analysis of steel wire inside the wire rope is based on the basic principle of the internal force of steel wire in the steel rope summed up by Costello, and the formula for calculating the stress of the steel wire inside the wire rope is deduced and the program is compiled. The calculation theory of steel wire stress in simple structure steel wire is extended to the calculation of internal steel wire stress in multi-layer and multi strand wire rope, which makes the internal steel wire stress in all kinds of steel wire rope more accurate quantitative analysis.2. to establish the space geometric model of wire rope and the finite element model to get the steel rope in the upright and bending state of the steel. The mathematical equation of the central axis of wire is established, and the geometric space model of wire rope and the finite element model are established according to the corresponding geometric relation, and the problems needing attention in the analysis of the finite element model of the wire rope are discussed. In addition, the theoretical calculation value is verified by the finite element model of the simple structure steel wire rope, and.3. is used to check the sling according to the theoretical calculation formula. According to the design standard and standard of railway bridge fatigue calculation in China, the fatigue strength obtained the corresponding fatigue load distribution mode. Using the bridge structure nonlinear analysis system BNLAS to calculate the corresponding load values of the sling. Combined with the fatigue load value of the sling, the theory derivation formula is used to carry out the most unfavorable fatigue points of steel wire internal steel wire. The fatigue strength of steel wire is obtained and the fatigue strength of wire rope sling is calculated according to the related theory. It is concluded that the steel wire rope in various structures can use the formula derived in this paper to calculate the stress of steel wire inside the wire rope, and the results of stress analysis can be obtained. The calculation analysis found that the wire rope is subjected to bending. When the finite element model of the steel wire rope is established, the wire rope can easily produce the problem of wire overlap caused by the deformation of steel wire, and the wire rope can be solved by mathematical modeling. The fatigue problem is very prominent at the cable straddle cable clamps, and the fatigue problem at the vertical sling section and anchorage is more relaxed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.25

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