【摘要】：不同形式的拱橋有其特有的合理成橋狀態(tài),不同方法施工的拱橋,其合理施工狀態(tài)也并非單一不變。拱橋合理成橋及合理施工狀態(tài)的確定包含了許多設(shè)計(jì)和施工參數(shù)的優(yōu)化,把極其關(guān)鍵的兩個(gè)點(diǎn)作為本文研究的主要內(nèi)容——合理施工階段索力及合理拱軸線形的計(jì)算優(yōu)化。本文依托國(guó)家自然科學(xué)基金資助項(xiàng)目《基于多目標(biāo)優(yōu)化的懸澆混凝土拱橋構(gòu)形與安全控制的理論與方法》,以貴州省龍場(chǎng)渡槽(主拱圈變寬、凈跨徑200m)為背景,具體的研究工作主要有以下幾個(gè)方面:(1)對(duì)國(guó)內(nèi)外鋼筋混凝土拱橋的發(fā)展進(jìn)行了綜述,闡述了幾種主要的施工方法,并對(duì)現(xiàn)有纜索吊裝斜拉扣掛法施工拱橋存在的問(wèn)題進(jìn)行了簡(jiǎn)要分析,最后提出了本文研究的主要內(nèi)容。(2)在確定合理施工狀態(tài)時(shí),從施工階段參數(shù)、結(jié)構(gòu)實(shí)際受力狀態(tài)、施工階段扣索索力確定等方面進(jìn)行了闡明;在確定合理成橋狀態(tài)時(shí),主要從主拱圈合理拱軸線、主拱圈合理成橋狀態(tài)、合理成橋扣索索力確定這幾個(gè)方面進(jìn)行了歸納。(3)提出了“一張索力通過(guò)靜力平衡確定,二張索力以調(diào)整內(nèi)力為主”的索力多次張拉控制思想;本橋采用了當(dāng)前節(jié)段吊裝多次張拉的方法進(jìn)行吊裝階段索力控制,節(jié)段吊裝完成后不再進(jìn)行索力調(diào)整。(4)合理施工索力計(jì)算及優(yōu)化過(guò)程中,采用基于影響矩陣的未知荷載系數(shù)法在Midas Civil有限元軟件中進(jìn)行了合理施工索力的優(yōu)化。通過(guò)頻率法實(shí)測(cè)的索力數(shù)據(jù)及主拱圈控制截面的實(shí)測(cè)應(yīng)力與理論數(shù)據(jù)的對(duì)比分析,驗(yàn)證了該方法優(yōu)化得到的索力是合理且施工中易于實(shí)現(xiàn)的。(5)探討了數(shù)值法在變截面主拱圈內(nèi)力計(jì)算中的應(yīng)用,計(jì)算過(guò)程中主要解決了兩個(gè)問(wèn)題:變截面主拱圈自重對(duì)應(yīng)的力臂進(jìn)行了形心的修正,避免了一般數(shù)值方法采用微元段中點(diǎn)造成的內(nèi)力偏差;變寬主拱圈面積函數(shù)的確定。(6)提供了一種利用MATLAB編程工具進(jìn)行變截面拱軸系數(shù)優(yōu)化的思路,并給出了MATLAB擬合程序。根據(jù)工程中拱圈變寬、懸臂拼裝的設(shè)計(jì)及施工特點(diǎn),采用三次樣條差值作為逼近函數(shù)對(duì)拱軸線進(jìn)行了擬合,通過(guò)優(yōu)化,拱軸線更加合理。
[Abstract]:Different types of arch bridges have their unique reasonable state of bridge construction, and the reasonable construction state of different methods of arch bridges is not a single one. The determination of reasonable bridge completion and reasonable construction state of arch bridge includes the optimization of many design and construction parameters. The two key points are considered as the main contents of this paper-the calculation and optimization of the rational cable force and the rational arch axis in the reasonable construction stage. Based on the project supported by the National Natural Science Foundation of China, "Theory and method of configuration and safety control of cantilever concrete arch bridge based on multi-objective optimization", this paper takes Longchang Aqueduct in Guizhou Province as the background, with the main arch circle becoming wider and the net span 200 m. The specific research work mainly includes the following aspects: (1) the development of reinforced concrete arch bridge at home and abroad is summarized and several main construction methods are expounded. At last, the main contents of this paper are put forward. (2) in order to determine the reasonable construction state, the parameters of the construction stage and the actual stress state of the structure are analyzed. In the process of construction, the determination of cable tension is expounded, and the reasonable arch axis of the main arch ring and the reasonable bridge state of the main arch ring in determining the reasonable state of the bridge are determined. The rational determination of cable force of bridge buckle is summarized. (3) the cable force is determined by static balance and the main force of two cables is to adjust the internal force. This bridge adopts the method of current segment hoisting and multiple tensioning to control the cable force in the hoisting stage, and the cable force adjustment is not carried out after the segmental lifting is completed. (4) in the process of rational construction cable force calculation and optimization, The unknown load coefficient method based on influence matrix is used to optimize the rational construction cable force in Midas Civil finite element software. Through the comparison and analysis between the measured cable force data measured by the frequency method and the measured stress of the control section of the main arch ring and the theoretical data, It is verified that the cable force obtained by this method is reasonable and easy to be realized in construction. (5) the application of numerical method to the calculation of internal force of the main arch ring with variable section is discussed. In the course of calculation, two main problems are solved: the force arm corresponding to the self-weight of the main arch ring with variable section is corrected by the centroid, which avoids the deviation of internal force caused by the midpoint of the micro-element section in the general numerical method; The determination of the area function of the main arch ring with variable width. (6) A method to optimize the coefficient of the arch axis with variable section by using MATLAB programming tool is provided, and the MATLAB fitting program is given. According to the design and construction characteristics of arch ring widening and cantilever assembly the cubic spline difference is used as the approximation function to fit the arch axis. Through optimization the arch axis is more reasonable.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.4

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鞠傳坤,張英新,曲業(yè)偉,孫玉坤;淺談利用偏角測(cè)設(shè)拱軸線[J];遼寧交通科技;2002年05期

2 林陽(yáng)子;黃僑;任遠(yuǎn);;拱橋拱軸線的優(yōu)化與選形[J];公路交通科技;2007年03期

3 劉山洪;李放;袁長(zhǎng)紅;;拱軸線橫向偏離對(duì)拱圈靜力行為影響[J];重慶交通學(xué)院學(xué)報(bào);2007年01期

4 張晶;;考慮軸向變形的合理拱軸線的有限元優(yōu)化[J];工程建設(shè)與設(shè)計(jì);2008年03期

5 吳建鑫;蔡敏;;遺傳算法下樣條函數(shù)曲線作為拱軸線的優(yōu)化[J];山西建筑;2009年03期

6 周尚猛;李亞?wèn)|;;求解合理拱軸線的加權(quán)能量方法[J];公路交通科技;2010年04期

7 周e，

本文編號(hào)：2285266