斜拉桥施工监控中的测量误差分析研究

发布时间：2018-06-25 04:56

本文选题：斜拉桥 + 误差分析　；参考：《郑州大学》2014年硕士论文

【摘要】：由于斜拉桥结构的特殊性，在施工过程中存在着多次体系转换。所以，其施工监控过程显得尤为重要。通过施工监控，对桥梁施工过程中的受力、变形及稳定进行监控，使施工中的结构处于最优状态，保证施工过程和成桥状态符合设计和规范的要求。本文以安阳市京港澳高速公路文峰大道分离式立交桥主桥为工程背景，对独塔双索面部分斜拉桥的施工监控工作进行了研究和实施，并对测量中的误差进行了详细的分析研究工作。首先，用MIDAS/Civil软件模拟分析施工过程中结构的的力学特性，得出各个工况下的内力、应力及位移；并建立索力影响矩阵，通过计算得出了第二次张拉的索力值，，为后期调索建立了理论依据。对梁段自重、斜拉索的张拉索力、支架刚度等结构参数进行了敏感性分析。然后，结合现场监测中的应力、桥面高程及斜拉索索力等数据进行了分析，剔除误差，得出了真实的测量值，与理论计算值吻合较好，且满足规范要求。使用规范上推荐的公式来计算混凝土的收缩、徐变应变，并根据现场实测数据计算温度应变，剔除这些应变后得到了测点的弹性应变，进而计算出控制截面的应力变化曲线。利用测站校核的方法对监控过程中，尤其是斜拉索两次张拉过程中，对桥面主梁高程测点的位移变化进行了误差分析，得出了较为满意的结果。现场采用频率法来实施此次监控过程的索力测量，并简要分析了索力测量过程中误差的产生原因及解决方法。斜拉桥的施工监控是一个复杂的过程，测量中的误差涉及很多因素，本文只针对部分斜拉桥进行了探讨，还存在很多内容需要完善。监控是一个长期的过程，不仅要对施工过程进行安全性监控，还需要对成桥后的结构状态进行长久的监测控制。
[Abstract]:Because of the particularity of the cable-stayed bridge structure, there are many system changes in the construction process. Therefore, its construction monitoring process is particularly important. Through the construction monitoring, the stress, deformation and stability of the bridge during the construction process are monitored, the structure in the construction is in the optimal state, and the construction process and the state of the bridge meet the requirements of the design and code. In this paper, based on the main bridge of Wenfeng Avenue separation overpass of Beijing-HongKong-Macao Expressway in Anyang City, the construction monitoring work of partial cable-stayed bridge with single tower and double cable plane is studied and implemented. The error in measurement is analyzed and studied in detail. First of all, we use Midas / Civil software to simulate and analyze the mechanical characteristics of the structure in the construction process, and get the internal force, stress and displacement under various working conditions, and establish the cable force influence matrix, and get the second tensioning cable force value through the calculation. The theoretical basis is established for the later adjustment. Sensitivity analysis of structural parameters such as beam deadweight, cable tension, support stiffness and so on is carried out. Then, combined with the stress in the field monitoring, the bridge deck height and cable force are analyzed, the error is eliminated, and the real measurement value is obtained, which is in good agreement with the theoretical calculation value and meets the requirements of the code. The concrete shrinkage and creep strain are calculated by the formula recommended in the code, and the temperature strain is calculated according to the measured data in the field. The elastic strain of the measuring point is obtained after these strains are excluded, and the stress change curve of the control section is calculated. By using the method of station checking, the error analysis of the displacement change of the height measuring point of the main girder of the bridge deck is carried out during the monitoring process, especially during the two tensioning process of the stay cable, and the satisfactory results are obtained. The frequency method is used to measure the cable force in the monitoring process, and the causes and solutions of the errors in the process of cable force measurement are analyzed briefly. The construction monitoring of cable-stayed bridge is a complicated process, and the error in the measurement involves many factors. This paper only discusses some cable-stayed bridges, and there are still many contents to be improved. Monitoring is a long-term process, not only to monitor the safety of the construction process, but also to monitor and control the structural state after completion of the bridge for a long time.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U445.1

【参考文献】