【摘要】：隨著計(jì)算理論和橋梁施工技術(shù)的進(jìn)步,獨(dú)塔空間主纜自錨式懸索橋被越來(lái)越多地應(yīng)用到工程實(shí)踐中。本文以江西上饒大橋?yàn)楣こ虒?shí)例,對(duì)獨(dú)塔空間主纜自錨式懸索橋纜索懸吊系統(tǒng)進(jìn)行結(jié)構(gòu)分析和施工技術(shù)探討。 成橋吊索索力的計(jì)算以及主纜線形的確定是空間主纜自錨式懸索橋設(shè)計(jì)的難點(diǎn),本文著重關(guān)注加勁梁的合理受力狀態(tài),探討吊索索力的優(yōu)化計(jì)算方法。在吊索力確定以后,結(jié)合索段數(shù)值分析法和非線性有限元法可以得到自錨式懸索橋主纜的線形和無(wú)應(yīng)力索長(zhǎng)。該方法簡(jiǎn)單易行,可以應(yīng)用于空間主纜自錨式懸索橋的初步設(shè)計(jì)計(jì)算。以江西上饒大橋?yàn)槔?驗(yàn)證該方法的有效性。 主纜架設(shè)施工是空間主纜自錨式懸索橋施工的關(guān)鍵步驟。以江西上饒大橋?yàn)槔?研究主纜基準(zhǔn)索股放樣、吊索索夾橫向安裝角度確定的問(wèn)題,以及如何消除主纜索股的鼓絲和扭絲現(xiàn)象。近似以拋物線模擬基準(zhǔn)索股線形,推導(dǎo)出主纜溫度以及主纜兩端點(diǎn)水平跨度、高差變化時(shí),索股線形變化的計(jì)算公式。根據(jù)實(shí)際工程情況分析主纜鼓絲和扭絲的原因并提出相應(yīng)的處理辦法。借鑒以往工程實(shí)例,得到一種簡(jiǎn)易的索夾橫向安裝角度的確定辦法。 自錨式懸索橋體系轉(zhuǎn)換過(guò)程中,吊索張拉方案的優(yōu)化關(guān)系到結(jié)構(gòu)的受力狀態(tài)是否合理,關(guān)系到結(jié)構(gòu)本身和施工的安全性。吊索張拉方案確定的重點(diǎn)在于吊索張拉力大小的準(zhǔn)確計(jì)算,由于主纜在吊索張拉過(guò)程中表現(xiàn)出幾何非線性,發(fā)生大位移,主纜索夾點(diǎn)和主梁錨固點(diǎn)之間的吊索長(zhǎng)度也隨主纜發(fā)生了遠(yuǎn)大于其彈性變形的變化。這樣的受力特性使吊索在張拉過(guò)程中張拉力和長(zhǎng)度的計(jì)算變得困難,本文提出等效節(jié)點(diǎn)力法計(jì)算吊索張拉力以及相應(yīng)張拉力的吊索長(zhǎng)度。等效節(jié)點(diǎn)力法是將吊索對(duì)主纜和主梁的拉力等效為節(jié)點(diǎn)力,通過(guò)迭代計(jì)算得到橋梁的平衡狀態(tài),繼而得到吊索張拉力和長(zhǎng)度。 以江西上饒大橋?yàn)楣こ虒?shí)例,采用等效節(jié)點(diǎn)力法探討?yīng)毸臻g主纜自錨式懸索橋體系轉(zhuǎn)換的吊索張拉順序、張拉力的優(yōu)化,確定鞍座頂推方案,對(duì)吊索張拉過(guò)程中橋梁主要構(gòu)件的受力狀態(tài)進(jìn)行分析,相應(yīng)結(jié)論可以為同類型橋梁提供借鑒。
[Abstract]:With the development of calculation theory and bridge construction technology, self-anchored suspension bridge with single tower space main cable is more and more used in engineering practice. Taking Shangrao Bridge in Jiangxi Province as an engineering example, the structure analysis and construction technology of cable suspension system of single tower space main cable self-anchored suspension bridge are discussed in this paper. The calculation of the cable force and the determination of the main cable shape are the difficulties in the design of the space main cable self-anchored suspension bridge. This paper focuses on the reasonable stress state of the stiffened beam and discusses the optimization calculation method of the cable force. After the cable force is determined, the linear shape and unstressed cable length of the main cable of self-anchored suspension bridge can be obtained by combining the numerical analysis of cable segment and nonlinear finite element method. The method is simple and practical and can be applied to the preliminary design and calculation of space main cable self-anchored suspension bridge. Taking Shangrao Bridge in Jiangxi Province as an example, the effectiveness of the method is verified. The construction of main cable erection is a key step in the construction of space main cable self-anchored suspension bridge. Taking Shangrao Bridge in Jiangxi Province as an example, this paper studies the problems of setting out the standard cable strands of the main cable, determining the lateral installation angle of the cable clips, and how to eliminate the phenomenon of the bulging and twisting of the main cable strands. The parabola is used to simulate the basic cable strands, and the formula for calculating the main cable temperature, horizontal span and height difference between the two ends of the main cable is derived. According to the actual engineering situation, the causes of main cable drum wire and twisting wire are analyzed and the corresponding treatment methods are put forward. A simple method for determining the angle of transverse installation of cable clamps is obtained by referring to previous engineering examples. In the process of system transformation of self-anchored suspension bridge, the optimization of sling tension scheme is related to whether the stress state of the structure is reasonable or not, and to the safety of the structure itself and construction. The emphasis of the determination of the tension scheme of the sling lies in the accurate calculation of the tension force of the sling. Due to the geometric nonlinearity of the main cable during the stretching of the sling, a large displacement occurs. The length of the sling between the clamping point of the main cable and the anchor point of the main beam also changes with the elastic deformation of the main cable. This force makes it difficult to calculate the tension and length of the sling during the process of tension. In this paper, the equivalent nodal force method is proposed to calculate the tension of the sling and the length of the sling of the corresponding tension. The equivalent node force method is that the tension of the sling to the main cable and the main beam is equivalent to the node force, and the equilibrium state of the bridge is obtained by iterative calculation, and then the tension and the length of the sling are obtained. Taking Shangrao Bridge in Jiangxi Province as an engineering example, using the method of equivalent nodal force, this paper discusses the tension sequence and tension optimization of the system conversion of the single tower space main cable self-anchored suspension bridge, and determines the scheme of saddle jacking. The stress state of the main components of the bridge in the process of sling tension is analyzed, and the corresponding conclusions can be used for reference for the same type of bridge.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.25;U445.4

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本文編號(hào)：2162854