大跨度预应力混凝土连续梁桥施工监控
发布时间：2019-07-07 21:34
【摘要】：随着桥梁建设的发展和预应力技术的提高,预应力混凝土连续梁桥作为一种大跨度桥型,得到越来越多的应用。为保证连续梁桥的成桥线形与设计线形很好的吻合,以及结构在施工过程的安全和稳定,施工监控受到越来越多的重视。本文以陇海路北辅道桥为工程背景,对大跨度预应力混凝土连续梁桥施工监控进行研究,主要研究内容及结论如下： (1)基于有限元原理及陇海路北辅道桥施工特点,利用Midas/Civil软件建立有限元模型,对该桥进行施工过程模拟分析,得出桥梁控制截面的应力状态； (2)通过建立的有限元计算模型,对北辅道桥设计参数进行敏感性分析。由敏感性的分析结果可知：混凝土容重、预应力误差、收缩徐变对主梁的挠度和应力的影响很大；墩身基础不均匀沉降对主梁挠度的影响很大；混凝土弹性模量对主梁的挠度和应力影响较小； (3)结合本工程受力特征及施工进度,编制施工监控方案,对大桥的施工全程进行线形监控和应力监控。通过有效的施工监控,北辅道桥各应力监测断面实际应力状态随施工进程发展状况符合预期设计目标,线形符合设计要求； (4)在应力监测中,对实测应力计算方法进行了研究。本文实测应力计算考虑阶段施工中收缩、徐变的影响,并用Matlab进行编程计算。通过比较分析,考虑混凝土收缩、徐变所得的实测应力与计算值差别较小,按此方法由实测应变得到桥梁的真实应力状态是可行的； (5)以陇海路北辅道桥为工程背景,测试了梁体的温度场。以温度场测试结果为依据,分析了晴天和阴天箱梁的温度场随时间变化的规律,得出箱梁截面的温度场分布形式并通过曲线拟合获得箱梁最大温差分布函数。在最大悬臂状态下,借助有限元软件Midas/Civil对桥梁结构温度梯度的作用效应进行了分析,结果表明温度梯度对结构变形的影响比较大。
文内图片：
图片说明：全桥合龙底板应力分布(MPa
[Abstract]:With the development of bridge construction and the improvement of prestress technology, prestressed concrete continuous beam bridge, as a kind of long-span bridge type, has been more and more used. In order to ensure that the bridge alignment of continuous beam bridge is in good agreement with the design alignment, as well as the safety and stability of the structure in the construction process, more and more attention has been paid to construction monitoring. In this paper, based on the engineering background of Longhai Road North Auxiliary Road Bridge, the construction monitoring of long-span prestressed concrete continuous beam bridge is studied. the main research contents and conclusions are as follows: (1) based on the finite element principle and the construction characteristics of Longhai Road North Auxiliary Road Bridge, the finite element model is established by using Midas/Civil software, and the stress state of the bridge control section is obtained by simulating and analyzing the construction process of the bridge. (2) through the finite element calculation model, the sensitivity analysis of the design parameters of Beifu Road Bridge is carried out. The results of sensitivity analysis show that the bulk density of concrete, prestress error, shrinkage and creep have great influence on the deflection and stress of the main beam, the uneven settlement of the pier foundation has a great influence on the deflection of the main beam, and the elastic modulus of concrete has little effect on the deflection and stress of the main beam. (3) according to the stress characteristics and construction progress of the project, the construction monitoring scheme is worked out, and the linear monitoring and stress monitoring are carried out in the whole construction process of the bridge. Through effective construction monitoring, the actual stress state of each stress monitoring section of Beifu Road Bridge accords with the expected design goal and the alignment meets the design requirements with the development of the construction process. (4) in the stress monitoring, the calculation method of the measured stress is studied. In this paper, the measured stress calculation takes into account the influence of shrinkage and creep in construction, and the programming calculation is carried out with Matlab. Through comparative analysis, considering the shrinkage of concrete, the difference between the measured stress and the calculated value is small, and it is feasible to obtain the real stress state of the bridge from the measured strain according to this method. (5) taking the north auxiliary road bridge of Longhai Road as the engineering background, the temperature field of the beam body is tested. Based on the test results of temperature field, the variation of temperature field of box girder in sunny and cloudy days with time is analyzed, and the temperature field distribution form of box girder section is obtained, and the maximum temperature difference distribution function of box girder is obtained by curve fitting. Under the condition of maximum cantilever, the effect of temperature gradient on the temperature gradient of bridge structure is analyzed by means of finite element software Midas/Civil. The results show that the temperature gradient has a great influence on the deformation of the structure.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
本文编号：2511460
文内图片：
图片说明：全桥合龙底板应力分布(MPa
[Abstract]:With the development of bridge construction and the improvement of prestress technology, prestressed concrete continuous beam bridge, as a kind of long-span bridge type, has been more and more used. In order to ensure that the bridge alignment of continuous beam bridge is in good agreement with the design alignment, as well as the safety and stability of the structure in the construction process, more and more attention has been paid to construction monitoring. In this paper, based on the engineering background of Longhai Road North Auxiliary Road Bridge, the construction monitoring of long-span prestressed concrete continuous beam bridge is studied. the main research contents and conclusions are as follows: (1) based on the finite element principle and the construction characteristics of Longhai Road North Auxiliary Road Bridge, the finite element model is established by using Midas/Civil software, and the stress state of the bridge control section is obtained by simulating and analyzing the construction process of the bridge. (2) through the finite element calculation model, the sensitivity analysis of the design parameters of Beifu Road Bridge is carried out. The results of sensitivity analysis show that the bulk density of concrete, prestress error, shrinkage and creep have great influence on the deflection and stress of the main beam, the uneven settlement of the pier foundation has a great influence on the deflection of the main beam, and the elastic modulus of concrete has little effect on the deflection and stress of the main beam. (3) according to the stress characteristics and construction progress of the project, the construction monitoring scheme is worked out, and the linear monitoring and stress monitoring are carried out in the whole construction process of the bridge. Through effective construction monitoring, the actual stress state of each stress monitoring section of Beifu Road Bridge accords with the expected design goal and the alignment meets the design requirements with the development of the construction process. (4) in the stress monitoring, the calculation method of the measured stress is studied. In this paper, the measured stress calculation takes into account the influence of shrinkage and creep in construction, and the programming calculation is carried out with Matlab. Through comparative analysis, considering the shrinkage of concrete, the difference between the measured stress and the calculated value is small, and it is feasible to obtain the real stress state of the bridge from the measured strain according to this method. (5) taking the north auxiliary road bridge of Longhai Road as the engineering background, the temperature field of the beam body is tested. Based on the test results of temperature field, the variation of temperature field of box girder in sunny and cloudy days with time is analyzed, and the temperature field distribution form of box girder section is obtained, and the maximum temperature difference distribution function of box girder is obtained by curve fitting. Under the condition of maximum cantilever, the effect of temperature gradient on the temperature gradient of bridge structure is analyzed by means of finite element software Midas/Civil. The results show that the temperature gradient has a great influence on the deformation of the structure.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
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