基于健康监测系统的青草背长江大桥构件承载能力研究

发布时间：2018-07-09 14:37

本文选题：悬索桥 + 评估　；参考：《重庆交通大学》2014年硕士论文

【摘要】：由于桥梁在设计和施工质量的缺陷以及在早期修建中普遍存在的承载等级不够等多方面的原因，使得许多的在役桥梁在安全性和正常使用功能上有着不同程度的隐患与缺陷。因此，对桥梁结构承载能力的评估就显得十分有必要。而20世纪以来，对在役桥梁进行实时监测则是桥梁工程领域的主要努力目标之一。当然，将健康监测引入桥梁结构承载能力评估一直以来都是一个难题，由于健康监测没有行业通用规范，尽管目前桥梁结构承载能力评估方法众多，但距离通用性的目标还有差距。本文依托重庆涪陵青草背长江大桥健康监测项目，将健康监测与桥梁检测进行结合，以青草背长江大桥健康监测静力性能指标为依据，从行业推荐性规范入手，对桥梁结构承载能力评估方法进行新的探讨，以此对青草背长江大桥主梁主塔主缆吊索等主要结构进行承载能力评估。具体工作如下： ①运用统计模式分析方法对实时监测数据进行分析，找到外界荷载对结构受力与变位改变的影响规律，包括主梁应变与位移，主塔应变与位移，，吊索索力，锚跨索力等主要静力性能指标。 ②采用有限元软件Midas/civil2010建立青草背长江大桥计算模型，计算出结构在各种荷载效应组合下的受力情况，结合温差效应影响分析，总结出健康监测传感器监测数据阀值，并将其作为承载能力评估的理论值。 ③结合健康监测实测数据与模型理论计算数据，将实测应力与理论应力的比值作为应力校验系数，将实测位移与理论位移的比值作为位移校验系数，从而利用以上两校验系数对大桥主梁、主塔的关键测点强度、刚度进行评估。 ④利用吊索、锚跨索的索力偏差率作为依据，拟定针对青草背长江大桥的索力评估标准，结合相关规范依据，对吊索、主缆承载能力进行评估。 ⑤根据健康监测实时监测结果，结合相关规范条文，拟定针对青草背长江大桥的承载能力评估标准及相应的管养维护建议。
[Abstract]:Due to the defects of the design and construction quality of the bridge and the insufficient bearing capacity in the early construction, many existing bridges have different degrees of hidden trouble and defects in safety and normal use function. Therefore, it is necessary to evaluate the bearing capacity of bridge structure. Since the 20th century, real-time monitoring of existing bridges has been one of the main goals in the field of bridge engineering. Of course, it has always been a difficult problem to introduce health monitoring into the assessment of the bearing capacity of bridge structure. Because there is no general industry standard for health monitoring, although there are many methods for evaluating the bearing capacity of bridge structure at present, But there is still a gap from the goal of universality. Based on the health monitoring project of Qingcaobei Yangtze River Bridge in Fuling, Chongqing, this paper combines health monitoring with bridge detection, based on the static performance index of Qingcaobei Yangtze River Bridge, and starts with industry recommended specifications. In order to evaluate the bearing capacity of the main girder main tower and cable of the Qingcao-back Yangtze River Bridge, a new approach is made to evaluate the bearing capacity of the bridge structure. The main works are as follows: 1 the real-time monitoring data are analyzed by statistical model analysis method, and the influence of external loads on the structural stress and displacement is found, including the strain and displacement of the main beam, the strain and displacement of the main tower. The main static performance indexes such as cable suspension force, anchor span cable force, etc. (2) the calculation model of Qingcao back Yangtze River Bridge is established by using the finite element software Midas / civil 2010, and the stress situation of the structure under various load effects is calculated. Combined with the analysis of the effect of temperature difference, the threshold value of monitoring data of health monitoring sensor is summarized, which is regarded as the theoretical value of carrying capacity assessment. 3 combined with the measured data of health monitoring and the theoretical calculation data of model, The ratio of measured stress to theoretical stress is taken as stress check coefficient, and the ratio of measured displacement to theoretical displacement is taken as displacement check coefficient. 4. Based on the deviation rate of cable force of sling and anchor span cable, the evaluation standard of cable force for Qingcao-back Yangtze River Bridge is drawn up. 5 according to the results of real-time monitoring of health monitoring, combined with the relevant specifications, the evaluation criteria for the carrying capacity of the Qingcao-back Yangtze River Bridge and the corresponding management and maintenance suggestions are proposed.
【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】：U448.25;U441

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