预应力混凝土连续刚构桥施工监控及温度效应研究

发布时间：2018-06-24 06:30

本文选题：连续刚构桥 + 施工监控　；参考：《福州大学》2014年硕士论文

【摘要】：近年来,随着国民经济及现代化交通运输事业的迅猛发展,人们对桥梁的性能要求越来越广泛。因为具有结构变形小,刚度大,行车平顺舒适,伸缩缝少,养护简单,抗震能力强等优点,还有施工方法相对简单,与同等跨度拱桥、斜拉桥及悬索桥相比造价较低,特别适合地形起伏较大的山区地理环境等特点,预应力混凝土连续刚构桥已成为我国大跨度桥梁的主导桥型。为保证施工过程的安全,并使成桥状态与设计理想状态较好的吻合,桥梁施工监控已经被纳入桥梁施工管理中的重要工作。本文采用与实际工程相结合的理论研究思路,对混凝土连续刚构桥施工监控和温度效应进行了研究。主要工作内容如下：1、总结了各种桥梁施工控制方法,研究了自适应控制方法在预应力混凝土连续刚构桥施工监控中的运用。采用Midas/Civil有限元软件对施工全过程进行模拟分析。运用最小二乘法对参数误差进行识别和修正。2、对悬臂现浇的预应力混凝土连续刚构桥施工过程主要设计参数做敏感性分析,根据各参数对结构状态的影响程度,有针对性地对关键参数取值进行验证和调整。3、在桥梁实际工程中布置挠度和应变观测点实施线形和应力监测。将实测数据与有限元模拟分析得到的理论值进行对比分析,验证模拟分析结果的准确性和施工监控的有效性。4、以贵安大桥为实际工程背景,分析了预应力混凝土连续刚构桥悬臂施工过程中日照温差效应对结构线形和应力的影响以及成桥状态下年温差效应对结构线形和应力的影响,并根据分析结果提出该桥梁最适宜的合拢温度。
[Abstract]:In recent years, with the rapid development of national economy and modern transportation, the performance requirements of bridges are more and more extensive. Because of the advantages of small deformation, large stiffness, smooth driving, less expansion joints, simple maintenance and strong seismic resistance, the construction method is relatively simple, and the cost is lower than that of the same span arch bridge, cable-stayed bridge and suspension bridge. The prestressed concrete continuous rigid frame bridge has become the dominant bridge type of long-span bridges in China. In order to ensure the safety of the construction process and make the state of the completed bridge coincide well with the ideal state of design, the monitoring of bridge construction has been incorporated into the important work of bridge construction management. In this paper, the construction monitoring and temperature effect of concrete continuous rigid frame bridge are studied by combining with practical engineering. The main work is as follows: 1. Various bridge construction control methods are summarized and the application of adaptive control method in the construction monitoring of prestressed concrete continuous rigid frame bridge is studied. Midas / Civil finite element software is used to simulate the whole construction process. Using the least square method to identify and correct the parameter error, the sensitivity analysis of the main design parameters of the cantilever cast-in-situ prestressed concrete continuous rigid frame bridge is made, according to the influence degree of each parameter on the structure state, the main design parameters of the cantilever cast-in-place prestressed concrete continuous rigid frame bridge are analyzed. The key parameters are verified and adjusted. 3. The deflection and strain observation points are arranged to monitor the shape and stress of the bridge. By comparing the measured data with the theoretical values obtained by finite element simulation analysis, the accuracy of simulation analysis results and the validity of construction monitoring are verified. The actual engineering background is Gui'an Bridge. This paper analyzes the influence of temperature difference effect of sunshine on the structure alignment and stress during the cantilever construction of prestressed concrete continuous rigid frame bridge and the effect of annual temperature difference effect on the structure alignment and stress under the condition of bridge completion. According to the analysis results, the optimum closing temperature of the bridge is put forward.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.1;U445.57

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