【摘要】：自錨式懸索橋因其美觀的外形、良好的受力形態(tài)和不受地質(zhì)條件約束的優(yōu)勢(shì),越來(lái)越受到工程界的重視,然而其特殊的合理成橋狀態(tài)計(jì)算方法和施工順序使得如何確定自錨式懸索橋合理成橋狀態(tài)和體系轉(zhuǎn)換方案一直是此類橋型的研究重點(diǎn)和難點(diǎn)。本文旨在獲得一種既滿足精確度要求又可避免繁復(fù)的有限元非線性計(jì)算的自錨式懸索橋合理成橋狀態(tài)計(jì)算方法,總結(jié)確定自錨式懸索橋體系轉(zhuǎn)換方案的方法和步驟,并確定算例橋梁的體系轉(zhuǎn)換方案。本文首先引述了懸索橋已有的主纜線形計(jì)算理論:拋物線法、分段懸鏈線法和節(jié)線法,根據(jù)算法編寫了相應(yīng)計(jì)算程序,并通過(guò)算例比較各理論的計(jì)算結(jié)果誤差。其次,將基于影響矩陣的合理成橋狀態(tài)計(jì)算方法進(jìn)行改良并創(chuàng)新應(yīng)用于自錨式懸索橋,隨后依托南京小龍灣橋?yàn)閷?shí)際工程背景,驗(yàn)證該計(jì)算方法的適用性和精確性。最后研究了自錨式懸索橋的體系轉(zhuǎn)換,并以小龍灣橋?yàn)槔?詳細(xì)敘述了吊索張拉方案的確定方法,提出了可行的張拉方案并根據(jù)各方案的優(yōu)缺點(diǎn)和現(xiàn)場(chǎng)條件選擇最優(yōu)方案應(yīng)用于實(shí)際施工。研究結(jié)果表明:懸索橋主纜線形的分段懸鏈線法為最精確解法,因此下文選定相應(yīng)的計(jì)算程序計(jì)算合理成橋狀態(tài);基于影響矩陣的自錨式懸索橋合理成橋狀態(tài)計(jì)算方法具備較高的適用性和精確性;確定的吊索張拉方案有效,使算例橋梁順利轉(zhuǎn)換到合理成橋狀態(tài)。至此,對(duì)于類似算例的自錨式懸索橋的主纜線形、合理成橋狀態(tài)以及體系轉(zhuǎn)換方案,本文得到了一套成熟的計(jì)算流程,并突破常規(guī),獲得了新的合理成橋狀態(tài)計(jì)算方法。確定的吊索張拉方式為類似橋型提供了工程借鑒。
[Abstract]:The self-anchored suspension bridge has been paid more and more attention by the engineering field because of its beautiful appearance, good force shape and advantages not constrained by geological conditions. However, its special and reasonable completion state calculation method and construction sequence make how to determine the reasonable completion state and system transition scheme of self-anchored suspension bridge has always been the focus and difficulty of this kind of bridge type research. The aim of this paper is to obtain a reasonable state calculation method of self-anchored suspension bridge, which can meet the requirement of accuracy and avoid the complexity of nonlinear finite element calculation, and summarize the methods and steps to determine the conversion scheme of self-anchored suspension bridge system. At the same time, the system conversion scheme of the bridge is determined. In this paper, the existing main cable alignment calculation theory of suspension bridge is quoted: parabola method, piecewise catenary method and node method. The corresponding calculation program is compiled according to the algorithm, and the error of calculation results of each theory is compared by an example. Secondly, the reasonable completed bridge state calculation method based on influence matrix is improved and innovatively applied to self-anchored suspension bridge. Then, the applicability and accuracy of the calculation method are verified based on the actual engineering background of Nanjing Xiaolong Bay Bridge. Finally, the system transformation of self-anchored suspension bridge is studied. Taking Xiaolong Bay Bridge as an example, the determination method of cable tension scheme is described in detail. The feasible tensioning scheme is put forward and the optimal scheme is selected according to the advantages and disadvantages of each scheme and the field conditions. The results show that the piecewise catenary method is the most accurate method for calculating the main cable shape of suspension bridge, so the corresponding calculation program is selected below to calculate the reasonable completion state of the bridge. The reasonable completion state calculation method of self-anchored suspension bridge based on the influence matrix has high applicability and accuracy, and the determined suspension cable tension scheme is effective, which makes the example bridge transfer to the reasonable completed bridge state smoothly. So far, for the main cable shape, reasonable completed state and system transition scheme of self-anchored suspension bridge with similar examples, a set of mature calculation flow has been obtained in this paper, and a new reasonable calculation method for the completed bridge state has been obtained by breaking through the conventional method of calculating the main cable shape, the reasonable completion state and the system transition scheme of the self-anchored suspension bridge. The method of cable tension can be used as a reference for similar bridge type.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U448.25

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