连续刚构大桥建设—营运期全寿命监测与评估技术

发布时间：2019-06-02 22:49

【摘要】：桥梁建设期的施工监控和营运期的健康监测分别对桥梁建设期和营运期的安全起积极的保障作用。目前这两者往往相对独立、没有形成一体化的监测模式,造成了桥梁监测信息的完整性、连贯性不足。另一方面,桥梁健康监测具有海量信息,而且由于桥梁本身存在材料、结构组合、工作环境、测试信号等方面的不确定性因素较多,造成至今未形成系统的桥梁安全评估方法和技术,大大影响了桥梁健康监测效率。在上述背景下,本论文以连续刚构大桥为研究对象,针对大型桥梁建设—营运期全寿命监测模式与实用化评估技术展开研究,主要研究内容包括： ①在对比分析大型桥梁建设期和营运期监测内容、监测项目的基础上,利用预埋—表贴传感器监测信息的相关性和“接力”,提出了大型桥梁建设—营运期全寿命监测的理念,并具体阐述了全寿命监测的原理、工作模式及它的优势；针对桥梁在建设期和营运期的应力监测信息量庞大,且可能存在缺失现象以及信号含有“噪声”因素的问题,研究了采用神经网络修复法对残缺数据进行修复,以及采用基于小波理论的信号消噪技术对监测信息中的“噪声”进行消除处理的相关技术。 ②从应力监测角度出发,借鉴荷载试验应变校验系数的概念,提出了大型桥梁基于监测信息的应力校验系数包络评估技术；在分析活载、温度、初始应力等因素的基础上,研究了大型桥梁基于容许应力包络的安全评估技术。 ③从挠度监测角度出发,结合挠度监测和数据包络分析的特点,借鉴荷载试验挠度校验系数的概念,提出了大型桥梁基于挠度校验系数包络的评估技术；结合桥梁设计规范中关于容许挠度的限值规定,研究了大型桥梁基于容许挠度包络的安全评估技术。 ④最后以重庆丰都龙河特大桥—主跨240m的连续刚构大桥为依托工程,利用丰富的建设期施工监控信息和营运期健康监测信息,具体阐述和验证了如何利用预埋—表贴传感器监测信息的相关性和“接力”,实现大型桥梁建设—营运期的全寿命监测；同时,利用实测数据,完成了该大桥基于应力和挠度监测的安全评估,该评估结果与大桥荷载试验检测结果对比分析表明,本文提出的基于应力和挠度“包络”的大桥安全评估技术是可行的。本文提出的连续刚构大桥建设—营运期全寿命监测与评估技术,对实施桥梁的全寿命监测与评估、保证桥梁结构安全具有积极的现实意义,具有良好的推广应用前景。
[Abstract]:The construction monitoring during the bridge construction period and the health monitoring during the operation period play an active role in ensuring the safety of the bridge construction period and the operation period, respectively. At present, the two are often relatively independent, there is no integrated monitoring model, resulting in the integrity of bridge monitoring information, insufficient coherence. On the other hand, bridge health monitoring has a lot of information, and because there are many uncertain factors in material, structure combination, working environment, test signal and so on, there are many uncertain factors in the bridge itself, such as material, structure combination, working environment, test signal and so on. As a result, there is no systematic bridge safety assessment method and technology, which greatly affects the efficiency of bridge health monitoring. Under the above background, this paper takes the continuous rigid frame bridge as the research object, and studies the whole life monitoring model and practical evaluation technology of large bridge construction and operation period. The main research contents are as follows: (1) based on the comparative analysis of the monitoring contents of the construction period and operation period of large bridges and the monitoring projects, the correlation and "relay" of monitoring information by using embedded and surface sensor are used. The concept of whole life monitoring for large bridge construction and operation period is put forward, and the principle, working mode and its advantages of whole life monitoring are expounded in detail. In view of the large amount of stress monitoring information in the construction period and operation period of the bridge, and the possible absence phenomenon and the "noise" factor in the signal, the neural network repair method is studied to repair the incomplete data. And the signal denoising technology based on wavelet theory is used to eliminate the noise in monitoring information. (2) from the point of view of stress monitoring, using the concept of strain check coefficient of load test for reference, the envelope evaluation technology of stress check coefficient of large bridge based on monitoring information is put forward. Based on the analysis of live load, temperature, initial stress and other factors, the safety assessment technology of large bridges based on allowable stress envelope is studied. (3) from the point of view of deflection monitoring, combined with the characteristics of deflection monitoring and data envelopment analysis, and referring to the concept of deflection check coefficient of load test, the evaluation technology of deflection check coefficient envelope of large bridges is put forward. Combined with the limit value of allowable deflection in bridge design code, the safety assessment technique of large bridge based on allowable deflection envelope is studied. (4) finally, based on the continuous rigid frame bridge with 240 m main span of Fengdu Longhe Bridge in Chongqing, the rich construction monitoring information and health monitoring information during operation are used. This paper expounds and verifies how to realize the whole life monitoring of large bridge construction and operation period by using the correlation and "relay" of the monitoring information of embedded and surface sticker sensors. At the same time, the safety assessment of the bridge based on stress and deflection monitoring is completed by using the measured data. The comparison and analysis between the evaluation results and the load test results of the bridge show that, The safety assessment technology of bridge based on stress and deflection envelope is feasible in this paper. The whole life monitoring and evaluation technology of continuous rigid frame bridge construction and operation period proposed in this paper has positive practical significance for carrying out the whole life monitoring and evaluation of bridge and ensuring the safety of bridge structure, and has a good prospect of popularization and application.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

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