某大跨径悬索桥施工监控关键技术研究

发布时间：2018-06-29 02:13

本文选题：悬索桥 + 施工监控　；参考：《湖北工业大学》2014年硕士论文

【摘要】：改革开放以来,我国桥梁建设水平特别是大中型桥梁方面取得了惊人的发展。大型桥梁虽然已经有很多例子,但是关于大型桥梁施工监控和有限元分析技术却还有值得完善和深入研究的必要。为了确保桥梁结构的安全,提高施工质量以及为同类桥梁施工监控研究提供必要的参考。本文以某大型悬索桥作为分析对象。详细介绍了问题提出的国内外背景,悬索桥发展现状,悬索桥主要特点及其将来发展趋势,桥梁施工中施工监控的重要性,桥梁施工中施工控制内容及其方法,对影响桥梁施工中施工监控的因素作了详细分析。具体阐述了本大型悬索桥施工中的施工监控及有限元分析,本论文用目前流行的MIDASICIVIL软件对本桥进行有限元模型模拟,建立了全桥整体模型,计算施工过程中各个施工阶段的结构挠度、内力、线形等,为应力测量和线形控制提供理论计算值及结构状态预期。本文研究过程基于施工监控对浇筑混凝土方量监测、支架变形监测、桥面堆载监测和预应力张拉监测、塔梁变形监测、拉索索力监测、塔梁应力监测、温度场监测等。有限元分析计算工况根据桥梁的施工步骤具体划分,施工阶段主要可划分为桥塔施工、混凝土主梁现浇、猫道施工、鞍座就位、主缆架设、索夹安装、吊索安装并张拉、拆除猫道阶段、桥面铺装及附属设施施工、运营阶段;计算内容包括加劲梁预抛高计算,吊索分级张拉顺序确定及张拉应力计算(吊索张拉过程中,主缆线形和主梁纵梁变形、应力均将产生相应的变化,经计算确定吊索张拉顺序、张拉力大小,保证张拉过程主梁纵梁的应力不超过最大值,成桥后梁、塔、内力及主缆线形符合设计规定),各施工阶段主缆轴力和线形计算,各施工阶段加劲梁内力和线形计算,各施工阶段主塔内力和塔顶偏位计算,索塔、主梁压缩补偿量计算,鞍座预偏值、顶推值计算,本文仅对索塔、主梁和主缆进行监控分析。将施工监测过程中实测值与有限元理论计算值进行对比研究,可以验证本次模拟计算的准确性与合理性,同时证明该桥施工及监控方法安全可靠。该大型悬索桥施工工艺特别,它的施工工艺、施工监控实测资料与模拟计算资料的分析对比方法和有限元方法模拟成果,能够为相同类型桥梁施工监控提供一定的借鉴。
[Abstract]:Since the reform and opening up, the level of bridge construction, especially the large and medium-sized bridges, has made remarkable development. Although there are many examples of large bridge construction monitoring and finite element analysis are still worthy of further study. In order to ensure the safety of bridge structure, improve the construction quality and provide necessary reference for the similar bridge construction monitoring research. This paper takes a large suspension bridge as an analysis object. This paper introduces in detail the domestic and foreign background of the problems raised, the present situation of the suspension bridge development, the main characteristics of the suspension bridge and its future development trend, the importance of the construction monitoring in the bridge construction, the construction control content and the methods in the bridge construction. The factors influencing the construction monitoring in bridge construction are analyzed in detail. The construction monitoring and finite element analysis in the construction of the large suspension bridge are expounded in detail. The finite element model of the bridge is simulated by the popular Midas software in this paper, and the whole bridge model is established. The deflection, internal force and shape of the structure in each construction stage are calculated, which provide theoretical calculation value and structure state expectation for stress measurement and linear control. The research process of this paper is based on the construction monitoring to monitoring the quantity of pouring concrete, the deformation monitoring of support, the monitoring of bridge deck load and prestressed tensioning, the deformation monitoring of tower beam, the monitoring of cable force, the stress monitoring of tower beam, the monitoring of temperature field, and so on. According to the concrete construction steps of the bridge, the working conditions of finite element analysis and calculation can be divided into three parts: bridge tower construction, concrete main beam cast-in-situ, catwalk construction, saddle position, main cable erection, cable clamp installation, sling installation and tension, In the phase of removing the catwalk, the bridge deck paving and ancillary facilities are being constructed, and the operation stage; the calculation includes the calculation of the pre-throwing height of the stiffened beam, the determination of the tension sequence of the slings and the calculation of the tensile stress (during the stretching of the slings, the deformation of the main cable line and the longitudinal beam of the main beam, The stress will be changed accordingly. The tension sequence and tension force of the sling will be determined by calculation to ensure that the stress of the longitudinal beam of the main beam does not exceed the maximum value during the tensioning process, and the rear beam and tower of the bridge are formed. The internal force and the shape of the main cable conform to the design regulations), the axial force and the line shape of the main cable are calculated in each construction stage, the internal force and the linear shape of the stiffened beam in each construction stage, the internal force and the top deviation of the tower in each construction stage, the compression compensation amount of the cable tower and the main beam, In this paper, only cable tower, main beam and cable are monitored and analyzed. The accuracy and rationality of the simulation calculation can be verified by comparing the measured values with the calculated values of finite element theory in the course of construction monitoring. At the same time, it is proved that the bridge construction and monitoring method is safe and reliable. The construction technology of the large suspension bridge is very special, its construction technology, the analysis and comparison of the measured data of construction monitoring and the simulated calculation data and the simulation results of the finite element method can provide some reference for the construction monitoring of the same type of bridge.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U445.4

【参考文献】