基于光纤监测的连续梁桥变形数值模拟研究

发布时间：2018-06-28 17:08

本文选题：连续梁桥 + 变形监测　；参考：《河南工业大学》2014年硕士论文

【摘要】：在古今中外的重大交通基础设施建设过程中，桥梁工程一直是控制性工程之一，是交通运输工程的咽喉所在，在人类社会的发展进程中起着不可替代的作用。近十几年来，随着社会的发展以及科学技术的进步，公路交通量的增长突飞猛进，大型重载的运输工具得到越来越多的使用，使得人们对桥梁的要求也越来越高。悬臂施工方法的出现，使预应力混凝土连续梁桥在整个桥梁工程领域空前的活跃起来。连续梁桥采用悬臂施工方法时，需要经过对称的单T静定结构，然后进行体系转换，转变为超静定结构，施工过程非常复杂，因此，在施工过程中需要通过模拟以及监测的的手段来确定桥梁结构在每个施工阶段的受力和变形情况，总结桥梁的变形规律，防止各种不利情况的出现，最终保证桥梁施工和运营过程的安全。本文依托郑州市贯通东西的重要通道——南四环道路工程(G107辅道十八里河段)当中的南水北调大桥，对预应力混凝土连续梁桥的发展历史及特点进行了概述，简要介绍了该桥梁的工程概况以及材料特性等，，并借助MIDAS/CIVIL软件介绍了建立了合适的桥梁分析模型具体过程，结合最小二乘法的参数估计方法，对一些参数进行了调整，最终得出了桥梁在位移以及内力方面的一些模拟计算结果，结合实测数据成果，进行对比分析，总结了桥梁变形的影响因素，发现： 1采用数值分析方法及其专业软件对桥梁进行施工监控，结合施工现场实测数据与参数，实时调整结构模型参数，可以使成桥线形与设计线形较好的吻合，从而保证施工质量满足相关规范要求，确保整个施工过程的安全。 2桥梁施工监测过程中获取有效且可靠的监测数据是至关重要的，因此应该采取有效的监测工具，比如光纤传感器等来获取可靠的监测数据。光纤传感器具有结构简单、重量轻、体积小、耐久性和耐腐蚀性较好等特点，其测量精度高，获取的监测数据稳定可靠，受外界因素影响较小，抗干扰性强。 3桥梁悬臂施工监控的一个关键环节是悬臂施工立模标高及结构线形控制。在实际施工过程中，必须采用专业的软件对其进行数值模拟，并且结合现场监测数据，应用合适的误差处理方法，不断的给出立模标高预测，最终使桥梁的实际成桥线形接近设计线形。 4自重、温度、钢束预应力、支座沉降、混凝土收缩徐变以及汽车活荷载等都会引起桥梁产生变形，在实际工程施工过程中应予以考虑，并采取的相应的措施，确保桥梁的质量。以上基本结论可以为以后同类桥梁的设计和施工提供有益的参考，对桥梁科研和发展奠定基础。
[Abstract]:In the process of major transportation infrastructure construction, bridge engineering has always been one of the controlling projects and the throat of transportation engineering, which plays an irreplaceable role in the development of human society. In the past ten years, with the development of society and the progress of science and technology, the traffic volume of highway has increased by leaps and bounds, and the large and heavy-haul transportation tools have been used more and more, which makes people's demand for bridges more and more high. With the emergence of cantilever construction method, prestressed concrete continuous beam bridge is becoming more and more active in the whole bridge engineering field. When the cantilever construction method is used in the continuous beam bridge, it is necessary to go through the symmetrical single T statically indeterminate structure, and then transform the system into the statically indeterminate structure. The construction process is very complicated, so, In the construction process, it is necessary to determine the stress and deformation of the bridge structure in each construction stage by means of simulation and monitoring, summarize the deformation law of the bridge, and prevent the occurrence of various adverse situations. Finally ensure the safety of bridge construction and operation process. Based on the South-to-North Water transfer Bridge in the South fourth Ring Road Project (G107 Fu Road, 18 li reach), the development history and characteristics of the prestressed concrete continuous beam bridge are summarized. This paper briefly introduces the engineering situation and material characteristics of the bridge, and introduces the concrete process of establishing a suitable bridge analysis model by means of Midas / CIVIL software, and adjusts some parameters in combination with the method of parameter estimation by the least square method. Finally, some simulation results of the displacement and internal force of the bridge are obtained, and the influence factors of the bridge deformation are summarized by comparing and analyzing the measured data. The results are as follows: (1) by using numerical analysis method and its professional software to monitor the construction of the bridge, combining with the measured data and parameters of the construction site, and adjusting the parameters of the structural model in real time, the alignment of the completed bridge and the design line can be well matched. In order to ensure that the construction quality meets the requirements of relevant codes and ensure the safety of the whole construction process. 2 it is very important to obtain effective and reliable monitoring data in the process of bridge construction monitoring. Therefore, effective monitoring tools should be adopted. Such as optical fiber sensors to obtain reliable monitoring data. The optical fiber sensor has the characteristics of simple structure, light weight, small volume, durability and corrosion resistance, etc. It has high measuring precision, stable and reliable monitoring data, and is less affected by external factors. A key link of bridge cantilever construction monitoring is the elevation of vertical formwork and the control of structure alignment in cantilever construction. In the actual construction process, we must use the professional software to carry on the numerical simulation to it, and combine the field monitoring data, apply the suitable error processing method, give the vertical mold elevation forecast unceasingly. Finally, the actual bridge shape of the bridge is close to that of the design line. 4 the weight, temperature, prestress, bearing settlement, shrinkage and creep of concrete and vehicle live load will cause the deformation of the bridge. The quality of the bridge should be ensured by the corresponding measures taken in the course of actual engineering construction. The above conclusions can provide a useful reference for the design and construction of similar bridges in the future and lay a foundation for bridge research and development.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446;U445.4

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