本文選題：人行懸索橋 + 有限元�。� 參考：《中南大學(xué)》2014年碩士論文

【摘要】：摘要：人行懸索橋以其優(yōu)美的線型、新穎的外觀以及選址靈活等優(yōu)點(diǎn)在山區(qū)和旅游景點(diǎn)都得到廣泛的應(yīng)用。但該類橋梁的剛度較小,使用中的抗風(fēng)險(xiǎn)能力偏小,為了確保其運(yùn)營(yíng)期間的安全性,日后維修與加固就顯得尤為重要。耒陽(yáng)市東洲公園人行索橋跨度111.58m,2001年建成交付使用,使用期間由于洪水浸泡錨碇加之使用荷載加大等因素影響,橋梁出現(xiàn)了索夾滑移、吊桿偏移、錨碇變位、剛度下降等系列病害,本文以該工程為背景,結(jié)合橋梁檢測(cè)和加固維修設(shè)計(jì)開展了相關(guān)研究工作。主要內(nèi)容有： 1.組織并實(shí)施該橋的檢測(cè)工作,包括外觀檢測(cè)、病害調(diào)查、線形測(cè)量、主纜索力測(cè)量、吊桿力測(cè)量、動(dòng)力特性測(cè)試等,以獲取該橋的現(xiàn)狀資料以彌補(bǔ)該橋竣工資料丟失的不足,為對(duì)該橋進(jìn)行性能評(píng)定、開展力學(xué)分析和加固設(shè)計(jì)奠定基礎(chǔ)。 2.利用Midas軟件建立了該橋的空間有限元模型實(shí)施計(jì)算機(jī)仿真分析：由于該橋的實(shí)測(cè)主纜線形與原設(shè)計(jì)線形存在較大的區(qū)別,以實(shí)測(cè)資料為基礎(chǔ),以實(shí)測(cè)線形和索力為目的,通過(guò)模型試算得出與實(shí)測(cè)結(jié)構(gòu)相吻合的結(jié)構(gòu)計(jì)算模型,據(jù)此開展理論分析和加固設(shè)計(jì)計(jì)算。 3.針對(duì)本橋設(shè)置了抗風(fēng)纜索的特點(diǎn),采用有限元法分析了風(fēng)纜的作用效應(yīng)及其對(duì)對(duì)全橋剛度的貢獻(xiàn),進(jìn)而論證了該橋加強(qiáng)風(fēng)纜的必要性。 4.原結(jié)構(gòu)設(shè)計(jì)的索夾在使用中出現(xiàn)了索夾滑移,導(dǎo)致吊桿形成偏移現(xiàn)象,結(jié)合加固設(shè)計(jì)擬提高結(jié)構(gòu)橋面剛度的技術(shù)思路,對(duì)索夾結(jié)構(gòu)、吊桿面積、換索方法和工藝等進(jìn)行研究,提出了一套新型人行索橋索夾結(jié)構(gòu)。 5.對(duì)水浸泡條件下的主纜錨錠進(jìn)行基礎(chǔ)受力分析與變位分析,從理論上研究該條件下對(duì)錨錠的影響,并提出了具體的加固措施。 6.基于以上理論分析,提出了該橋加固設(shè)計(jì)的全套技術(shù)措施,加固后的效果良好。圖105幅,表39個(gè),參考文獻(xiàn)50篇
[Abstract]:Abstract: pedestrian suspension bridge has been widely used in mountainous areas and tourist attractions for its beautiful line shape, novel appearance and flexible location. However, the stiffness of this kind of bridge is small, and the ability to resist risks in use is small. In order to ensure the safety of the bridge during operation, it is particularly important to maintain and strengthen the bridge in the future. The span of the pedestrian cable bridge in Tongzhou Park, Leiyang City, was 111.58 m, which was completed and put into use in 2001. During the use of the bridge, due to the influence of flood immersion Anchorage and increasing use load and other factors, the bridge appeared cable slippage, boom deviation, Anchorage displacement, and so on. With the background of this project, the research work is carried out on the basis of bridge detection and strengthening and maintenance design. The main contents are: 1. Organize and carry out the inspection work of the bridge, including appearance detection, disease investigation, linear measurement, main cable force measurement, suspension force measurement, dynamic characteristic test, etc., in order to obtain the current status information of the bridge to make up for the missing of the bridge completion data, For the performance evaluation of the bridge, mechanical analysis and reinforcement design laid a foundation. 2. The spatial finite element model of the bridge is established by Midas software to carry out computer simulation. Because there is a great difference between the measured main cable shape of the bridge and the original design line shape, based on the measured data, the purpose of the computer simulation is to measure the line shape and cable force. The calculation model of the structure which is consistent with the measured structure is obtained through the model trial calculation, and the theoretical analysis and reinforcement design calculation are carried out accordingly. According to the characteristics of the anti-wind cable, the effect of wind cable and its contribution to the stiffness of the bridge are analyzed by finite element method, and the necessity of strengthening the wind cable is demonstrated. 4. The slippage of the cable clamps in the original structural design resulted in the deviation of the suspenders. Combined with the technical ideas of strengthening design to improve the stiffness of the bridge deck, the structure of the cable clamps, the area of the suspenders, the methods and techniques of the replacement of cables were studied. A new type of cable-clamped structure of footbridge is presented. This paper analyzes the stress and displacement of the anchor ingot under the condition of water immersion, studies the influence of this condition on the anchor ingot in theory, and puts forward the concrete reinforcement measures. Based on the above theoretical analysis, a complete set of technical measures for the reinforcement design of the bridge is put forward. 105 figures, 39 tables, 50 references
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.25;U445.72

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本文編號(hào)：2110813