九江大桥斜拉桥箱梁截面温度场特性及预测模型研究
发布时间：2019-03-19 17:37
【摘要】：混凝土箱梁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，采用不间断连续观测的方法对该桥混凝土箱梁温度场进行了长期观测。根据布置在混凝土箱梁的30个温度传感器实测获得的温度数据，对测点日温度场及年温度场、顺桥和横桥向温度场变化、日温度变化和年温度变化模型进行了研究。本文主要研究内容如下： （1）介绍了九江大桥结构健康监测系统与传感器的布置，总结了混凝土结构温度场影响因素及相关参数计算理论，开展了混凝土箱梁温度场观测。 （2）选取不同季节的典型测试样本，对混凝土箱梁翼缘板和底板日温度场进行了分析，获得了翼缘板下缘和底板所有测点日温度时变规律，以及日照下顺桥和横桥方向测点温度场分布规律。 （3）选取每天12:00和0:00两个典型时刻数据，对翼缘板和底板测点年温度场以及顺桥和横桥方向测点年温度场分布进行了研究，获得了九江大桥年温度场特性变化规律和不同季节温度变化特性。 （4）分别采用一个全周期的正弦函数来描述实测温度的日变化特征和一个半周期的正弦函数来描述实测温度的年变化特征，建立了九江大桥日温度变化特性和年温度变化特性预测模型。
[Abstract]:The temperature effect of the concrete box girder will result in structural stress and deformation, which can affect the safe operation of the bridge, and the research on the temperature field of the bridge has practical engineering significance. Based on the health monitoring system of the structure of the cable-stayed bridge of Jiujiang Bridge, the temperature field of the concrete box girder of the bridge is observed for a long time by the method of continuous and continuous observation. According to the measured temperature data of the 30 temperature sensors arranged in the concrete box girder, the temperature field of the measuring point and the annual temperature field, the temperature field, the daily temperature change and the annual temperature change model were studied. The main contents of this paper are as follows: (1) The arrangement of the health monitoring system and the sensor of the Jiujiang Bridge is introduced, the influence factors of the temperature field of the concrete structure and the calculation theory of the related parameters are summarized, and the temperature field view of the concrete box girder is carried out. (2) A typical test sample of different seasons is selected, and the temperature field of the flange plate and the bottom plate of the concrete box girder is analyzed, the time-varying law of the temperature of all the measuring points on the lower edge of the flange plate and the bottom plate is obtained, and the temperature field of the measuring points in the direction measuring point of the lower edge of the flange plate and the transverse bridge direction is obtained. The distribution of the temperature field and the temperature field distribution in the direction of the bridge and the transverse bridge were studied at 12:00 and 0:00 per day. The changes of the temperature field and the temperature of different seasons in the Jiujiang Bridge were obtained. (4) The annual variation of the measured temperature is described by using a sinusoidal function of a full cycle to describe the daily change characteristic of the measured temperature and the sine function of a half cycle, and the temperature change characteristic and the annual temperature change of the Jiujiang Bridge are established.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
本文编号：2443742
[Abstract]:The temperature effect of the concrete box girder will result in structural stress and deformation, which can affect the safe operation of the bridge, and the research on the temperature field of the bridge has practical engineering significance. Based on the health monitoring system of the structure of the cable-stayed bridge of Jiujiang Bridge, the temperature field of the concrete box girder of the bridge is observed for a long time by the method of continuous and continuous observation. According to the measured temperature data of the 30 temperature sensors arranged in the concrete box girder, the temperature field of the measuring point and the annual temperature field, the temperature field, the daily temperature change and the annual temperature change model were studied. The main contents of this paper are as follows: (1) The arrangement of the health monitoring system and the sensor of the Jiujiang Bridge is introduced, the influence factors of the temperature field of the concrete structure and the calculation theory of the related parameters are summarized, and the temperature field view of the concrete box girder is carried out. (2) A typical test sample of different seasons is selected, and the temperature field of the flange plate and the bottom plate of the concrete box girder is analyzed, the time-varying law of the temperature of all the measuring points on the lower edge of the flange plate and the bottom plate is obtained, and the temperature field of the measuring points in the direction measuring point of the lower edge of the flange plate and the transverse bridge direction is obtained. The distribution of the temperature field and the temperature field distribution in the direction of the bridge and the transverse bridge were studied at 12:00 and 0:00 per day. The changes of the temperature field and the temperature of different seasons in the Jiujiang Bridge were obtained. (4) The annual variation of the measured temperature is described by using a sinusoidal function of a full cycle to describe the daily change characteristic of the measured temperature and the sine function of a half cycle, and the temperature change characteristic and the annual temperature change of the Jiujiang Bridge are established.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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