刚果（布）1号公路Loukouni桥静力优化和疲劳性能研究
发布时间：2018-08-17 20:10
【摘要】：随着桥梁技术的发展创新,桥梁在结构形式上也越来越多样化,在桥梁设计中如何兼顾安全性和经济性成为设计的重点。Loukouni桥是刚果(布)国家1号公路中的一座典型上承式钢箱拱桥,为了使用最少的成本设计出结构最优,安全性能良好的大桥,提高其使用年限,并为以后类似拱桥的设计研究提供技术支持,对Loukouni桥的静力优化分析和疲劳性能研究是具有重要意义的。本文的主要研究内容包括:(1)使用ANSYS软件建立了Loukouni桥的全桥有限元模型,分别对拱桥的拱轴系数、拱肋截面尺寸以及拱肋与立柱连接节点形式进行了优化。结果表明:拱轴系数为1.543时是最合理的;Loukouni桥的拱肋截面具有一定的优化空间,且在四个截面关键参数中,截面应力值对截面高度h的变化最为敏感;推荐使用立柱两端全部刚接的节点连接形式。(2)选取了拱肋和横撑处构造细节,参考不同国家的疲劳车辆荷载模型,通过影响面最不利加载方式计算出了构造细节处的疲劳应力幅,结果表明:这两处构造细节是安全的,欧洲规范下的疲劳验算最为保守,在设计时推荐使用欧洲规范,以保障桥梁疲劳设计的安全性。(3)针对选取的2个构造细节进行了疲劳试验研究,每种类型的构造细节得到了21个有效数据点,对其进行了名义应力-寿命曲线拟合,并与各国规范中的曲线进行了比较,发现拟合出的直线与中欧2种规范给出的直线拟合度较高,说明试验结果能够很好地反应构造细节的疲劳性能,并且可将拟合出的疲劳曲线应用于以后类似工程的相关构造细节中。(4)用ANSYS软件建立了2个构造细节的精细化有限元模型,使用国际焊接学会中给出的线性外推路径法得到拱肋处疲劳细节的应力集中系数。并对该处细节进行了热点应力-寿命曲线拟合,与各国规范相应曲线进行了比较,结果表明目前规范给出的热点应力-寿命曲线的安全性是有待考证的。对2处构造细节进行了疲劳寿命评估和疲劳使用年限预测,建议在Loukouni桥的构造细节达到疲劳使用年限前对其进行安全检测以防止危险事故的发生。本课题研究可为以后桥梁的静力和疲劳性能研究提供技术支持,并有利于对各国规范的深入认识和挖掘,为今后相关规范的学习、修正和制定提供一些参考。
[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.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441
本文编号：2188763
[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.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441
【参考文献】
相关期刊论文 前10条
1 吕彭民;李大涛;;正交异性钢桥面板顶板疲劳性能研究[J];中国公路学报;2014年02期
2 张熙胤;陈兴冲;王常峰;;梁拱组合桥吊杆力优化及工程应用[J];铁道建筑;2014年01期
3 王元清;陈蕴威;任剑波;宗亮;武电坤;李俊;;钢-混凝土组合梁桥设计方法的中欧规范对比分析[J];建筑结构学报;2013年S1期
4 李俊;;基于欧洲规范的上承式钢箱拱桥结构设计[J];中外公路;2013年02期
5 刘延芳;鲍卫刚;周泳涛;翟辉;;公路钢桥疲劳荷载研究[J];公路;2013年01期
6 王元清;宗亮;张龙英;贾瑞华;施刚;;考虑中欧规范差异的刚果(布)Loukouni大桥设计复核分析[J];铁道科学与工程学报;2012年05期
7 张建芝;;刚果(布)国家1号公路Mindouli-Brazzaville段桥梁设计与计算[J];中外公路;2012年02期
8 金小川;周宗红;金小安;纪承子;;中国桥梁设计使用年限的研究[J];公路与汽运;2012年02期
9 刘延芳;周泳涛;鲍卫刚;翟辉;;公路钢桥疲劳标准荷载推导方法研究[J];中外公路;2012年01期
10 陈祥华;;武夷山公馆大桥垮塌 生命大营救[J];安全与健康;2011年16期
相关博士学位论文 前2条
1 刘迎春;上承式拉索组合拱桥索力优化与受力性能研究[D];北京工业大学;2012年
2 任伟平;焊接钢桥结构细节疲劳行为分析及寿命评估[D];西南交通大学;2008年
相关硕士学位论文 前4条
1 朱雪光;单肋中承式钢拱桥关键部位优化设计研究[D];北京建筑大学;2013年
2 伍忠林;矩形钢管混凝土桁架拱桥及其静力性能分析[D];长安大学;2011年
3 吴绍波;中下承式拱桥吊杆疲劳安全研究与设计探讨[D];重庆大学;2008年
4 师义军;既有公路钢桥剩余疲劳寿命评估及疲劳可靠性研究[D];西安建筑科技大学;2005年
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