【作者】 黄强；

【导师】 刘山洪；

【作者基本信息】 重庆交通大学 ， 结构工程， 2009， 硕士

【摘要】 在拱桥监控中,有应力和挠度监测,应力监测保证拱桥施工的安全性,挠度监测为了控制成桥后的线形。因此,拱桥的挠度监测具有重要的监控意义。而挠度监测数据预处理会影响正常的判断。由于挠度本身较小,临近于测量误差的边缘,为了区分挠度与误差,提取挠度特征,必须设法消除较大误差(超限误差),提高测量精度,从而尽可能地减少观测误差对挠度分析的影响。在挠度监测中,受观测条件的影响,挠度监测资料不可能显示拱桥主拱圈挠度的整体变化情况。如果仅仅分析监测资料,就有可能得出错误的结论。因此,需要对挠度变形监测数据进行预处理。本文主要围绕以下五个方面展开研究工作:(1)针对监测数据的超限误差,本文介绍了数据处理的统计分析理论和方法,整体检验法从整体上判断观测向量中是否伴随有超限误差,局部检验法具体判断哪些观测值伴随有超限误差。(2)从理论的角度分析,一元线性回归分析适用于线性相关两个变量,离散傅立叶变换对信号的局部特性分析具有很大的局限性。(3)运用MATLAB软件,应用“3σ准则”和小波分析预处理挠度监测数据,起到了很好的效果。(4)采用理论分析与多项式曲线拟合相结合的方法,判断6次多项式拟合曲线与钢拱架在主拱圈的三个主要施工阶段的挠度整体发展趋势相吻合。(5)根据曾家沟石拱桥挠度监测数据的表格和图形,分析挠度变形的趋势、规律和幅度,找出统计规律并进行成因分析。在对日温度变化的影响分析时,在同样的情况下,中午(高温)时的拱顶较早上(低温)有上升的趋势,因此,在监测挠度时,应在早上低温的时候测量。更多还原

【Abstract】 There is stress and deflection monitoring at arch bridge monitoring. Stress monitoring guarantee the safety of bridge construction and deflection monitoring is to control the line of the arch bridge in operational phase. Therefore, deflection monitoring has important significance of the monitoring. Deflection monitoring data pre-treatment will affect the normal assessment. Because of their smaller deflection near the edge in the measurement error, in order to distinguish between the deflection and error, extract the deflection characteristics, we must try to eliminate the large errors (overrun error), improve the measurement accuracy, thus reducing the impact of the observation error on the deflection analysis as much as possible. At the monitoring deflection, Deflection monitoring data can not show the overall deflection of the main arch ring by monitoring conditions. If just analyzing monitoring data, it is possible to draw wrong conclusions. Therefore, we need to preprocess the deflection deformation monitoring data.This study is mainly focusing on the five aspects as following:(1)For the monitoring data overrun error, this study introduced the theories and methods of statistical analysis for data-processing, The overall test method judges the observation vector whether or not accompanied by overrun error. The local test method determines which specific observation data accompanied with overrun error.(2)From a theoretical point of view, linear regression analysis is applied to two variables with linear correlation, and there are great limitations when Discrete Fourier Transform analyzes the local characteristics of signal.(3)Application of "3σcriteria" and wavelet analysis to pre-processing deflection monitoring data using MATLAB software has played a very good effect.(4)Using of theoretical analysis with a combination of polynomial curve fitting method to judge 6th polynomial fitting curve coincides with steel gantry overall deflection development trend when the main arch ring is in the three main construction phases.(5)According to the tables and graphics of Zengjiagou stone arch deflection monitoring data, analyzing the deflection deformation trend law and range, and finding statistics law and its causes. When analyzing the affect of date temperature change, in the same circumstances, the vault at noon (in high temperature) was higher then in the morning; therefore, deflection monitoring should be measured in the low-temperature morning.更多还原