G325九江大桥斜拉桥温度场研究
发布时间：2018-09-04 05:50
【摘要】：混凝土斜拉桥的温度效应将产生结构应力与变形,影响桥梁的安全运营,对桥梁温度场开展研究具有实际工程意义。基于九江大桥斜拉桥结构健康监测系统,采用连续观测的方法对该桥温度场进行了长期观测,得到了九江大桥箱梁和桥塔的温度数据。采用统计技术和温度场全寿命模拟技术,对测点日温度变化、年温度变化以及桥梁温度场全寿命模拟进行了研究,并对桥塔温度效应引起拉索拉力变化进行了有限元分析。本文主要研究内容如下:(1)根据G325九江大桥结构健康监测系统与长期观测获得的温度场数据,采用局部平均插补法得到了箱梁典型截面5个不同测点(JM21--JM25)一年的全部温度数据。(2)对进行补偿后的年度数据进行分析,获得了J M2不同测点全年温度概率密度分布与温度样本JM22的典型日变化曲线;根据整年的实测月极值,采用最小二乘估计法,对月极值模型进行了研究。(3)采用数值逆变换抽样与温度样本调整理论,建立了G325九江大桥斜拉桥箱梁温度场全寿命年模拟方法,得到了九江大桥全寿命样本模型与温差模型,该模拟生成的温度场可应用于G325九江大桥混凝土箱梁的全寿命温度效应分析。(4)采用ANS YS有限元软件,建立了G3 25九江大桥桥塔的二维有限元模型,对桥塔两侧温差引起的拉索拉力变化进行了分析。
[Abstract]:The temperature effect of concrete cable-stayed bridge will produce structural stress and deformation and affect the safe operation of the bridge. It is of practical engineering significance to study the temperature field of the bridge. Based on the structural health monitoring system of the cable-stayed bridge of Jiujiang Bridge, the temperature field of the bridge was observed for a long time by continuous observation, and the temperature data of box girder and tower of Jiujiang Bridge were obtained. The daily temperature variation, annual temperature change and the whole life simulation of bridge temperature field are studied by means of statistical technique and full-life simulation technique of temperature field, and the finite element analysis of cable tension caused by temperature effect of bridge tower is carried out. The main contents of this paper are as follows: (1) according to the temperature field data obtained from the G325 Jiujiang Bridge structural health monitoring system and long-term observation, The local average interpolation method is used to get the whole temperature data of five different measuring points (JM21--JM25) of box girder in one year. (2) the annual data after compensation are analyzed. The typical diurnal variation curves of temperature probability density distribution and temperature sample JM22 at different measuring points of J M2 are obtained, and the least square estimation method is used according to the measured monthly extremum of the whole year. The monthly extreme value model is studied. (3) by using the theory of numerical inversion sampling and temperature sample adjustment, the full-life simulation method of temperature field of box girder of G325 Jiujiang Bridge is established, and the full-life sample model and temperature difference model of Jiujiang Bridge are obtained. The temperature field generated by the simulation can be applied to the whole life temperature effect analysis of the concrete box girder of G325 Jiujiang Bridge. (4) the two-dimensional finite element model of the tower of the G325 Jiujiang Bridge is established by using ANS YS finite element software. The variation of cable tension caused by the temperature difference between the two sides of the bridge tower is analyzed.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.5;U448.27
本文编号：2221197
[Abstract]:The temperature effect of concrete cable-stayed bridge will produce structural stress and deformation and affect the safe operation of the bridge. It is of practical engineering significance to study the temperature field of the bridge. Based on the structural health monitoring system of the cable-stayed bridge of Jiujiang Bridge, the temperature field of the bridge was observed for a long time by continuous observation, and the temperature data of box girder and tower of Jiujiang Bridge were obtained. The daily temperature variation, annual temperature change and the whole life simulation of bridge temperature field are studied by means of statistical technique and full-life simulation technique of temperature field, and the finite element analysis of cable tension caused by temperature effect of bridge tower is carried out. The main contents of this paper are as follows: (1) according to the temperature field data obtained from the G325 Jiujiang Bridge structural health monitoring system and long-term observation, The local average interpolation method is used to get the whole temperature data of five different measuring points (JM21--JM25) of box girder in one year. (2) the annual data after compensation are analyzed. The typical diurnal variation curves of temperature probability density distribution and temperature sample JM22 at different measuring points of J M2 are obtained, and the least square estimation method is used according to the measured monthly extremum of the whole year. The monthly extreme value model is studied. (3) by using the theory of numerical inversion sampling and temperature sample adjustment, the full-life simulation method of temperature field of box girder of G325 Jiujiang Bridge is established, and the full-life sample model and temperature difference model of Jiujiang Bridge are obtained. The temperature field generated by the simulation can be applied to the whole life temperature effect analysis of the concrete box girder of G325 Jiujiang Bridge. (4) the two-dimensional finite element model of the tower of the G325 Jiujiang Bridge is established by using ANS YS finite element software. The variation of cable tension caused by the temperature difference between the two sides of the bridge tower is analyzed.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.5;U448.27
【参考文献】
相关硕士学位论文 前1条
1 王世成;桥梁结构非线性温度分析与后处理系统开发[D];长安大学;2004年
，本文编号：2221197
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2221197.html
