变截面连续梁施工监控分析研究

发布时间：2018-01-19 00:09

本文关键词： 施工监控灰色理论应力温度合龙挠度监测　出处：《新疆农业大学》2014年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土连续桥梁跨越能力大、设计、施工工艺成熟,施工不影响桥下通车、通航,因此得到了广泛的采用。但是预应力混凝土连续桥梁悬臂施工难度较大,各个施工阶段内力、挠度变化较大,如果施工不当容易出现较大的质量事故。因此对预应力混凝土连续梁桥进行施工监控,确保各个施工阶段的施工安全,保证悬臂施工的顺利合龙,确保施工合龙后的线性满足设计要求,就显得尤为重要。本文以实际的工程项目为依托,对预应力混凝土连续梁桥施工监控的相关理论进行研究分析,并将理论和工程实践相结合,从而指导施工。本文首先对连续梁桥施工监控的结构分析方法:正装分析法、倒退分析法进行了简要的论述,通过阅读大量的施工监控文献,对影响施工监控的主要因素做了归纳总结,论述了施工监控中常用的误差调整方法。针对本次监控桥梁的实际情况,制定了施工监测计划,提出了应力监测、标高监测、温度监测、合龙段高差监测的原则及方法,确保了本次桥梁施工监控的顺利实施。采用大型桥梁计算分析软件MIDAS对本桥进行精确模拟、计算分析,提出了理论预拱度、节段梁体的应力,用以指导施工。桥梁施工监控现场量测是十分重要的一项内容,本文对现场的挠度、线性、应力、温度、合龙段高差等进行了详细的测量、记录,并和理论计算结果进行对比分析,根据分析结果,对结构计算、施工参数进行实时调整,从而确保了桥梁施工的质量。通过监控发现,主梁各截面理论计算应力值与实测值较为接近,说明预应力钢绞线张拉有效;各截面应力实测值除个别数据存在离散外,绝大部分均小于其应力限值、且有较大富余量,说明整个施工过程中结构始终处于安全状态。挠度和线形、合龙段的高差均满足相关规范的要求。主桥成桥线形过渡自然,达到了施工监控的预期效果。通过对本桥梁的施工监控,将监控理论应用于实际的桥梁监控中,实时指导施工,从而实现了本桥的顺利合龙。
[Abstract]:Prestressed concrete continuous bridge has the advantages of large span capacity, mature design and construction technology, and construction does not affect the opening of traffic under the bridge and navigation. Therefore, it is widely used, but the cantilever construction of prestressed concrete continuous bridge is difficult, and the internal force and deflection change greatly in each construction stage. If the construction is not easy to occur a large quality accident, so the prestressed concrete continuous beam bridge construction monitoring, to ensure the construction of each stage of construction safety, to ensure the smooth closure of cantilever construction. It is very important to ensure the linearity of the construction to meet the design requirements. Based on the actual project, this paper studies and analyzes the relevant theory of the construction monitoring of prestressed concrete continuous beam bridge. And the combination of theory and engineering practice to guide the construction. Firstly, this paper briefly discusses the structural analysis methods of continuous beam bridge construction monitoring: formal analysis method, retrogressive analysis method. Through reading a large number of construction monitoring documents, this paper summarizes the main factors affecting construction monitoring, discusses the error adjustment methods commonly used in construction monitoring, and aims at the actual situation of this monitoring bridge. The construction monitoring plan is established, and the principles and methods of stress monitoring, elevation monitoring, temperature monitoring and height difference monitoring of closure section are put forward. To ensure the smooth implementation of the bridge construction monitoring. Using the large-scale bridge calculation and analysis software MIDAS to accurately simulate the bridge, calculate and analyze, put forward the theoretical pre-arch, the stress of segment beam. In order to guide the construction, the field measurement of bridge construction monitoring is very important. In this paper, the deflection, linearity, stress, temperature, height difference of closure section are measured and recorded in detail. And compared with the theoretical calculation results, according to the analysis results, the structure calculation, construction parameters are adjusted in real time, so as to ensure the quality of the bridge construction. The calculated stress value of each section of the main beam is close to the measured value, which shows that the tension of the prestressed steel strand is effective. Except for the discrete individual data, most of the measured stress values of each section are less than its stress limit value, and there is a large amount of surplus, which shows that the structure is always in a safe state, deflection and line shape in the whole construction process. The height difference of the closure section can meet the requirements of the relevant codes. The main bridge has a natural linear transition and achieves the expected effect of construction monitoring. Through the construction monitoring of this bridge, the monitoring theory is applied to the actual bridge monitoring. Real-time guidance construction, thus realizing the smooth closure of the bridge.
【学位授予单位】：新疆农业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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