發(fā)布時間：2018-10-09 07:35

【摘要】：雙塔混凝土自錨式懸索橋在國內(nèi)應(yīng)用廣泛。此類橋梁最主要的構(gòu)造特點(diǎn)就是主纜錨固于加勁梁上，施工過程中必須采用先梁后纜的施工步驟，這導(dǎo)致施工過程較為復(fù)雜。對此類橋梁的施工控制進(jìn)行研究具有現(xiàn)實(shí)意義。目前，國內(nèi)外在混凝土自錨式懸索橋施工控制方面的研究主要集中在對某一特定施工階段的精細(xì)化模擬。施工過程的研究主要集中在張拉方案優(yōu)化和參數(shù)敏感性分析等方面，對施工監(jiān)控過程中的控制細(xì)節(jié)研究不足，對施工方法的創(chuàng)新不多。 本文建立了雙塔混凝土自錨式懸索橋的成橋有限元模型，由成橋模型推算了各關(guān)鍵施工階段的模型，將有限元計(jì)算結(jié)果與解析法計(jì)算結(jié)果進(jìn)行了對比，驗(yàn)證了有限元模型的正確性。在此模型基礎(chǔ)上，探討了依托有限元進(jìn)行施工模擬及控制存在的問題及解決的方法，分析了不同控制方法的誤差。根據(jù)工程背景的特點(diǎn)，提出了架設(shè)參數(shù)求解辦法和施工控制方案。將雙塔混凝土自錨式懸索橋的張拉過程分成：空纜架設(shè)、初張拉、位控過渡、體系轉(zhuǎn)換、局部微調(diào)、最終成橋等個六階段，分析了各階段的自錨式懸索橋的受力特點(diǎn)和變形特征，有針對性的提出了不同階段的施工控制目標(biāo)和特色控制方案，具體為：針對邊跨成橋線形高于空纜線形的特點(diǎn)，，提出了先頂再張法和邊跨被動張拉法兩項(xiàng)施工方案。張拉過程中，為減小位移控制法施工過程中的人為誤差，改進(jìn)了錨頭外露量控制法，提出了標(biāo)記線控制法。體系轉(zhuǎn)換階段，針對單根吊索張拉力過大特點(diǎn)，提出了一張一補(bǔ)張拉方案。 針對雙塔混凝土自錨式懸索橋共性特點(diǎn)及小龍灣大橋的個性特點(diǎn)提出了的施工方案，對部分方案及措施進(jìn)行了改進(jìn)，提高了施工的精度和施工效率，保證了小龍灣大橋體系轉(zhuǎn)換工作的順利完成。
[Abstract]:Double-tower concrete self-anchored suspension bridge is widely used in China. The main structural characteristic of this kind of bridge is that the main cable is anchored on the stiffened beam, and the construction procedure of the first beam and then the cable must be adopted in the construction process, which leads to the more complicated construction process. It is of practical significance to study the construction control of this kind of bridge. At present, domestic and foreign research on construction control of concrete self-anchored suspension bridge is mainly focused on the fine simulation of a specific construction stage. The research of construction process mainly focuses on the optimization of tensioning scheme and parameter sensitivity analysis, but the research on control details in construction monitoring process is insufficient, and the innovation of construction method is not much. In this paper, the finite element model of the double tower concrete self-anchored suspension bridge is established, and the models of each key construction stage are calculated from the bridge model. The results of finite element calculation are compared with those of the analytical method. The correctness of the finite element model is verified. On the basis of this model, the problems and solutions of construction simulation and control based on finite element are discussed, and the errors of different control methods are analyzed. According to the characteristics of engineering background, the method of setting up parameters and the construction control scheme are put forward. The tensioning process of double-tower concrete self-anchored suspension bridge is divided into six stages: aerial cable erection, initial tension, position control transition, system conversion, local fine-tuning, and finally bridge, etc. This paper analyzes the stress characteristics and deformation characteristics of self-anchored suspension bridges in different stages, and puts forward the construction control objectives and characteristic control schemes in different stages. The specific contents are as follows: according to the characteristics that the line shape of the side span bridge is higher than that of the empty cable line, Two construction schemes are put forward: first top and second stretch and side span passive tension. In order to reduce the artificial error in the construction process of the displacement control method, the control method of the exposure of the anchor head is improved and the marking wire control method is put forward. In the stage of system transformation, a one-piece-one-patch tension scheme is proposed in view of the excessive tension of a single sling. In view of the common characteristics of double-tower concrete self-anchored suspension bridge and the individual characteristics of Xiaolong Bay Bridge, the construction scheme is put forward, and some schemes and measures are improved to improve the construction precision and construction efficiency. The system conversion of Xiaolong Bay Bridge is guaranteed to be completed smoothly.
【學(xué)位授予單位】：南京林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4;U448.25

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