融合长期监测数据的中小跨径梁式桥技术状况评定方法初探

发布时间：2018-06-08 13:53

本文选题：中小桥梁 + 健康监测　；参考：《重庆交通大学》2015年硕士论文

【摘要】：本文以一座安装长期监测系统的简支梁桥为依托工程,基于该桥的定期检测数据和长期监测数据,针对中小桥梁结构特点,提出了一种融合定期检测数据和长期监测数据的中小跨径梁式桥技术状况评估方法。本文主要研究成果如下:①将应变、跨中挠度、基础沉降及裂缝宽度监测项目分别作为一种病害融合在现有的桥梁技术状况评定标准之中,将人工表观检测结果和监测数据纳入统一评估体系中,解决了长期监测数据和人工检测数据互不相容的问题。②将使用度指标和K线图引入到中小桥梁的技术状况评定之中,利用使用度指标和变化趋势给出各监测项目的评定等级及评定标准。③对依托工程应变监测数据、跨中挠度监测数据和裂缝监测数据进行处理分析,绘制应变、跨中挠度和裂缝监测值以日和以周为周期的使用度曲线和动向指标曲线,并结合评定标准及人工检查报告对全桥技术状况进行评估,证明评估方法的合理性和实用性。④绘制新村中桥监测时间内温度曲线并和桥梁应变、挠度及裂缝监测值使用度曲线及动向指标曲线进行对比分析,得出简支梁桥应变监测值变化主要是由汽车荷载产生的,而裂缝监测值变化主要是温度变化产生的,挠度监测值则几乎不受温度影响。⑤采用误差最小准则和遗传算法对新村中桥传感器配置进行优化计算,得出简支梁桥长期监测传感器除在跨中截面布置外,其余传感器采用均匀对称布置。⑥提出中小桥梁融合监测数据使用度和动向指标的单项预警机制,给出各监测项目报警级别及报警指标,经过依托工程的实际应用,证明该方法的有效性和直观性。
[Abstract]:In this paper, a simple supported beam bridge with long term monitoring system is used as a support project. Based on the periodic detection data and long-term monitoring data of the bridge, a method for evaluating the technical condition of small and medium span beam bridge is proposed, which is based on the characteristics of small and medium bridge structures. The strain, the mid span deflection, the foundation settlement and the crack width monitoring project are respectively used as a kind of disease fusion in the existing evaluation criteria of the existing bridge technology. The artificial apparent detection results and monitoring data are incorporated into the unified evaluation system, and the problem of the incompatibility between the long-term monitoring data and the artificial detection data is solved. The standard and K-line map are introduced to the technical status assessment of small and medium bridges, and the evaluation grades and criteria of each monitoring project are given by using the index and trend of change. Thirdly, the strain monitoring data and fracture monitoring data are processed and analyzed based on the strain monitoring data of the engineering, the strain, the mid span deflection and the fracture monitoring value are drawn. The use degree curve and the trend index curve of the daily and weekly cycle, and evaluate the technical status of the whole bridge with the evaluation standard and the manual inspection report, and prove the rationality and practicability of the evaluation method. (4) to draw the curve of the temperature curve in the monitoring time of the new village bridge and the curve of the use degree of the monitoring value of the bridge and the deflection and the cracks. The contrast analysis of the standard curve shows that the change of the strain monitoring value of the simple supported beam bridge is mainly produced by the vehicle load, and the change of the monitoring value of the crack is mainly caused by the temperature change, and the deflection monitoring value is almost not affected by the temperature. 5. The minimum error criterion and the genetic algorithm are used to optimize the configuration of the new village bridge sensor. In addition to the middle cross section arrangement, the long-term monitoring sensors of the bridge are evenly arranged. 6. A single warning mechanism is proposed for the use degree and the trend index of the small and medium bridge fusion monitoring data. The alarm level and the alarm index of the monitoring items are given. The effectiveness and direct of the method are proved through the practical application of the work process. View nature.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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