考虑温度效应的自适应控制理论在桥梁监控中的研究

发布时间：2018-07-03 13:58

本文选题：自适应控制 + 连续梁桥　；参考：《沈阳建筑大学》2015年硕士论文

【摘要】：伴随着经济的发展,我国的交通事业也在不断地发展,预应力连续梁桥在我国桥梁建设上具有举足轻重的地位。但无论是公路连续梁桥还是铁路连续梁桥,在施工时都或多或少的会出现施工线形与设计线形以及梁体受力与设计值之间的差异。因此,为确保预应力连续梁桥在施工和成桥后能达到设计线形和受力要求,有必要在施工过程中进行监控。在施工过程中桥梁的挠度和受力受到诸多因素的影响,例如量测误差、各种参数误差,如果这些误差在施工过程中不能及时修正,将会导致合龙困难,桥面线形呈波浪形,并会影响桥梁的安全,降低使用寿命。本文以头道松花江大桥为工程背景,结合自适应最优控制理论,并总结国内外预应力连续梁桥成功的监控实例,提出了一些新的监控理念和措施,并形成了一套监控理论和流程,运用这套理论指导头道松花江大桥施工时取得了较好的效果。本文主要研究了：1、调研了国内外预应力连续梁桥的发展以及监控理论和方法。2、介绍了施工控制的主要内容,并分析了正装分析法、倒装分析法、无应力状态分析法三种方法的差异,探究了施工控制的发展思想。3、总结分析了预拱度的三种计算方法,并对多种挠度计算方法进行比较。4、应用大型有限元软件MIDAS/CIVIL对头道松花江大桥进行仿真计算和模拟分析,并进行参数敏感性分析,通过分析发现,自重和预应力是影响桥梁挠度和应力的主要参数。针对施工中出现的测量误差、施工误差和参数误差,运用Kalman滤波法将施工误差和测量误差滤去,并运用最小二乘法估计参数,使得模型误差得以修正。5、对本大桥的监控研究采用自适应监控理论,根据施工阶段的划分,将分为两个阶段进行自适应过程的控制。由于悬臂施工的前5#块受温度的影响较小,没有考虑温度的影响,将其列为第一阶段的控制,5#块之后温度的影响就不容忽视了,这时将考虑温度影响后的控制列为第二阶段的控制。6、以头道松花江大桥的施工控制过程为实例,介绍了施工控制的全过程和详细内容,例如：传感器的布设、应力的量测、挠度测量、误差识别、立模标高的调整等。在第二阶段的控制中,考虑温度效应后再结合Kalman滤波法,能够较准确地分析识别出施工过程中的各种误差,从而可以提供较为精确的施工预拱度,及时调整立模标高,为桥梁的理想线形、合理受力以及顺利合龙打下了基础。控制结果表明,运用二阶段控制法对线形进行控制。在大桥合拢后,根据实测值与理论值的对比分析,线形的最大偏差仅1.3cm,挠度控制在允许的误差20mm范围以内,并且桥梁整体线形平顺,应力监测结果也在容许的范围内。
[Abstract]:With the development of economy, the transportation industry of our country is developing constantly, and the prestressed continuous beam bridge plays an important role in the bridge construction of our country. However, whether highway continuous beam bridge or railway continuous beam bridge, there will be more or less the difference between the construction line and the design line, and between the beam force and the design value. Therefore, in order to ensure that the prestressed continuous beam bridge can meet the design line and force requirements after the construction and completion of the bridge, it is necessary to monitor the construction process. In the process of construction, the deflection and force of the bridge are affected by many factors, such as measurement error, various parameter errors, if these errors can not be corrected in time during the construction process, it will lead to the closure difficulty, and the line shape of the bridge deck will be wave-shaped. It will affect the safety of the bridge and reduce the service life. In this paper, based on the engineering background of Songhua River Bridge, combining with the theory of adaptive optimal control, and summarizing the successful monitoring examples of prestressed continuous beam bridge at home and abroad, some new monitoring ideas and measures are put forward. A set of monitoring theory and flow are formed, which is used to guide the construction of Songhua River Bridge. This paper mainly studies the development of prestressed continuous beam bridge at home and abroad, and introduces the main contents of construction control. The difference of three methods of stress free state analysis is discussed, the development thought of construction control is explored, and three calculation methods of pre-arch degree are summarized and analyzed. In this paper, several deflection calculation methods are compared. Finally, a large finite element software Midas / CIVIL is used to simulate and analyze Songhua River Bridge in Tou Dao, and the sensitivity of parameters is analyzed. Weight and prestress are the main parameters that affect the deflection and stress of the bridge. Aiming at the measurement error, construction error and parameter error in construction, the Kalman filter method is used to filter the construction error and measurement error, and the least square method is used to estimate the parameters. The model error can be corrected .5. the adaptive monitoring theory is adopted in the monitoring research of this bridge. According to the division of construction stage, the adaptive process is controlled in two stages. Because the influence of temperature on the front block of cantilever construction is small, the influence of temperature on the first stage of the control block can not be ignored. At this time, the control after considering the influence of temperature is listed as the control of the second stage. Taking the construction control process of Songhua River Bridge in Toutou Road as an example, the whole process and detailed contents of construction control are introduced, such as the installation of sensors and the measurement of stress. Deflection measurement, error identification, elevation adjustment of vertical die, etc. In the control of the second stage, considering the temperature effect and combining with the Kalman filtering method, we can accurately analyze and identify all kinds of errors in the construction process, so as to provide more accurate construction camber and adjust the elevation of the vertical formwork in time. It lays the foundation for the ideal alignment, reasonable force and smooth closure of the bridge. The control results show that the two-stage control method is used to control the alignment. After the closure of the bridge, according to the comparison and analysis between the measured and theoretical values, the maximum deviation of the linear shape is only 1.3 cm, the deflection is controlled within the allowable error 20mm range, and the overall alignment of the bridge is smooth, and the stress monitoring results are within the allowable range.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

【相似文献】