【摘要】：隨著橋梁技術(shù)的發(fā)展創(chuàng)新,橋梁在結(jié)構(gòu)形式上也越來越多樣化,在橋梁設(shè)計(jì)中如何兼顧安全性和經(jīng)濟(jì)性成為設(shè)計(jì)的重點(diǎn)。Loukouni橋是剛果(布)國(guó)家1號(hào)公路中的一座典型上承式鋼箱拱橋,為了使用最少的成本設(shè)計(jì)出結(jié)構(gòu)最優(yōu),安全性能良好的大橋,提高其使用年限,并為以后類似拱橋的設(shè)計(jì)研究提供技術(shù)支持,對(duì)Loukouni橋的靜力優(yōu)化分析和疲勞性能研究是具有重要意義的。本文的主要研究?jī)?nèi)容包括:(1)使用ANSYS軟件建立了Loukouni橋的全橋有限元模型,分別對(duì)拱橋的拱軸系數(shù)、拱肋截面尺寸以及拱肋與立柱連接節(jié)點(diǎn)形式進(jìn)行了優(yōu)化。結(jié)果表明:拱軸系數(shù)為1.543時(shí)是最合理的;Loukouni橋的拱肋截面具有一定的優(yōu)化空間,且在四個(gè)截面關(guān)鍵參數(shù)中,截面應(yīng)力值對(duì)截面高度h的變化最為敏感;推薦使用立柱兩端全部剛接的節(jié)點(diǎn)連接形式。(2)選取了拱肋和橫撐處構(gòu)造細(xì)節(jié),參考不同國(guó)家的疲勞車輛荷載模型,通過影響面最不利加載方式計(jì)算出了構(gòu)造細(xì)節(jié)處的疲勞應(yīng)力幅,結(jié)果表明:這兩處構(gòu)造細(xì)節(jié)是安全的,歐洲規(guī)范下的疲勞驗(yàn)算最為保守,在設(shè)計(jì)時(shí)推薦使用歐洲規(guī)范,以保障橋梁疲勞設(shè)計(jì)的安全性。(3)針對(duì)選取的2個(gè)構(gòu)造細(xì)節(jié)進(jìn)行了疲勞試驗(yàn)研究,每種類型的構(gòu)造細(xì)節(jié)得到了21個(gè)有效數(shù)據(jù)點(diǎn),對(duì)其進(jìn)行了名義應(yīng)力-壽命曲線擬合,并與各國(guó)規(guī)范中的曲線進(jìn)行了比較,發(fā)現(xiàn)擬合出的直線與中歐2種規(guī)范給出的直線擬合度較高,說明試驗(yàn)結(jié)果能夠很好地反應(yīng)構(gòu)造細(xì)節(jié)的疲勞性能,并且可將擬合出的疲勞曲線應(yīng)用于以后類似工程的相關(guān)構(gòu)造細(xì)節(jié)中。(4)用ANSYS軟件建立了2個(gè)構(gòu)造細(xì)節(jié)的精細(xì)化有限元模型,使用國(guó)際焊接學(xué)會(huì)中給出的線性外推路徑法得到拱肋處疲勞細(xì)節(jié)的應(yīng)力集中系數(shù)。并對(duì)該處細(xì)節(jié)進(jìn)行了熱點(diǎn)應(yīng)力-壽命曲線擬合,與各國(guó)規(guī)范相應(yīng)曲線進(jìn)行了比較,結(jié)果表明目前規(guī)范給出的熱點(diǎn)應(yīng)力-壽命曲線的安全性是有待考證的。對(duì)2處構(gòu)造細(xì)節(jié)進(jìn)行了疲勞壽命評(píng)估和疲勞使用年限預(yù)測(cè),建議在Loukouni橋的構(gòu)造細(xì)節(jié)達(dá)到疲勞使用年限前對(duì)其進(jìn)行安全檢測(cè)以防止危險(xiǎn)事故的發(fā)生。本課題研究可為以后橋梁的靜力和疲勞性能研究提供技術(shù)支持,并有利于對(duì)各國(guó)規(guī)范的深入認(rèn)識(shí)和挖掘,為今后相關(guān)規(guī)范的學(xué)習(xí)、修正和制定提供一些參考。
[Abstract]:With the development and innovation of bridge technology, the structure of bridge is becoming more and more diversified. How to balance safety and economy in bridge design. Loukouni Bridge is a typical steel box arch bridge in Congo (Brazzaville) No. 1 highway. In order to use the least cost, the structure of Loukouni Bridge is the best. The bridge with good safety performance can improve its service life and provide technical support for the design and research of similar arch bridges in the future. It is of great significance for the static optimization analysis and fatigue performance study of Loukouni bridges. The main contents of this paper are as follows: (1) the finite element model of the full bridge of Loukouni bridge is established by using ANSYS software, and the arch axis coefficient, the section size of arch rib and the connection form of arch rib and column are optimized respectively. The results show that the arch rib section of Loukouni bridge has some optimized space when the arch axis coefficient is 1.543, and the stress value of the section is the most sensitive to the change of the section height h among the four key parameters of the section. It is recommended to use all rigid connections at both ends of column. (2) the structure details of arch rib and transverse brace are selected, and the fatigue vehicle load models of different countries are referred to. The fatigue stress amplitude at the structural details is calculated by the most unfavorable loading method of the influence surface. The results show that the two structural details are safe and the fatigue checking calculation under the European Code is the most conservative, and the European Code is recommended in the design. In order to ensure the safety of bridge fatigue design. (3) fatigue test was carried out for two selected structural details. 21 valid data points were obtained for each type of structural details, and the nominal stress-life curve fitting was carried out. Compared with the curves in the codes of various countries, it is found that the fitted straight line is higher than that of the two kinds of codes in Central Europe, which shows that the test results can well reflect the fatigue performance of the structural details. And the fitted fatigue curve can be applied to the related structural details of similar projects. (4) two fine finite element models of structural details are established by using ANSYS software. The stress concentration factors of the fatigue details of arch ribs are obtained by using the linear extrapolation path method given in the International Welding Institute. The details of the hot spot stress-life curve are fitted and compared with the corresponding curves in various countries. The results show that the safety of the hot-spot stress-life curve given by the current code needs to be verified by textual research. The fatigue life evaluation and fatigue life prediction of two structural details are carried out. It is suggested that the Loukouni bridge should be inspected safely before it reaches its fatigue life in order to prevent the occurrence of dangerous accidents. This research can provide technical support for the study of the static and fatigue performance of bridges in the future, and also be helpful to the further understanding and excavation of the national norms, and provide some references for the study, revision and formulation of the relevant codes in the future.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 呂彭民;李大濤;;正交異性鋼橋面板頂板疲勞性能研究[J];中國(guó)公路學(xué)報(bào);2014年02期

2 張熙胤;陳興沖;王常峰;;梁拱組合橋吊桿力優(yōu)化及工程應(yīng)用[J];鐵道建筑;2014年01期

3 王元清;陳蘊(yùn)威;任劍波;宗亮;武電坤;李俊;;鋼-混凝土組合梁橋設(shè)計(jì)方法的中歐規(guī)范對(duì)比分析[J];建筑結(jié)構(gòu)學(xué)報(bào);2013年S1期

4 李俊;;基于歐洲規(guī)范的上承式鋼箱拱橋結(jié)構(gòu)設(shè)計(jì)[J];中外公路;2013年02期

5 劉延芳;鮑衛(wèi)剛;周泳濤;翟輝;;公路鋼橋疲勞荷載研究[J];公路;2013年01期

6 王元清;宗亮;張龍英;賈瑞華;施剛;;考慮中歐規(guī)范差異的剛果(布)Loukouni大橋設(shè)計(jì)復(fù)核分析[J];鐵道科學(xué)與工程學(xué)報(bào);2012年05期

7 張建芝;;剛果(布)國(guó)家1號(hào)公路Mindouli-Brazzaville段橋梁設(shè)計(jì)與計(jì)算[J];中外公路;2012年02期

8 金小川;周宗紅;金小安;紀(jì)承子;;中國(guó)橋梁設(shè)計(jì)使用年限的研究[J];公路與汽運(yùn);2012年02期

9 劉延芳;周泳濤;鮑衛(wèi)剛;翟輝;;公路鋼橋疲勞標(biāo)準(zhǔn)荷載推導(dǎo)方法研究[J];中外公路;2012年01期

10 陳祥華;;武夷山公館大橋垮塌 生命大營(yíng)救[J];安全與健康;2011年16期

相關(guān)博士學(xué)位論文 前2條

1 劉迎春;上承式拉索組合拱橋索力優(yōu)化與受力性能研究[D];北京工業(yè)大學(xué);2012年

2 任偉平;焊接鋼橋結(jié)構(gòu)細(xì)節(jié)疲勞行為分析及壽命評(píng)估[D];西南交通大學(xué);2008年

相關(guān)碩士學(xué)位論文 前4條

1 朱雪光;單肋中承式鋼拱橋關(guān)鍵部位優(yōu)化設(shè)計(jì)研究[D];北京建筑大學(xué);2013年

2 伍忠林;矩形鋼管混凝土桁架拱橋及其靜力性能分析[D];長(zhǎng)安大學(xué);2011年

3 吳紹波;中下承式拱橋吊桿疲勞安全研究與設(shè)計(jì)探討[D];重慶大學(xué);2008年

4 師義軍;既有公路鋼橋剩余疲勞壽命評(píng)估及疲勞可靠性研究[D];西安建筑科技大學(xué);2005年

，

本文編號(hào)：2188763