超高层建筑结构施工模拟及现场监测研究

发布时间：2018-06-16 17:24

本文选题：超高层建筑 + 收缩徐变　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：超高层结构在混凝土收缩徐变等作用下会产生明显的竖向变形,过大的竖变形差会影响结构施工过程的安全性和使用阶段的适用性。伸臂桁架和巨型斜撑是超高层结构的重要抗侧力构件,其安装秩序会影响竣工后结构的抗震性能,在施工过程中如何合理提前闭合伸臂桁架和巨型斜撑是超高层结构施工亟待解决的工程问题。本文以正在建造中的中国第一高楼深圳平安国际金融中心为背景,分析了超高层结构的竖向变形,对伸臂桁架和巨型斜撑的闭合时间和顺序进行了分析,对其进行了现场监测,研究了其附加应力的监控方法。研究了竖向变形的影响因素及预留补偿。考虑混凝土的收缩徐变,用Midas/Gen对超高层结构进行了施工过程的模拟分析,研究了楼层预留标高和竖向构件预留长度沿结构高度的变化规律。超高层施工复杂且持续时间长,具有出现停工的风险,研究了停工、施工速度和核心筒超前施工层数对结构的竖向变形和竖向变形差的影响,进一步研究了当这些因素与前期设定的不一致情况下,对预留补偿进行优化调整。研究了伸臂桁架闭合时间和顺序及监控方法。提前闭合伸臂桁架可以加强施工中结构的稳定性,但伸臂桁架会产生附加应力,施工时需要兼顾到两者。从伸臂桁架所在楼层的竖向变形差变化这个角度来分析,研究了伸臂桁架斜腹杆和弦杆合理的安装时间和顺序。同时在施工现场对伸臂桁架斜腹杆预留缝进行位移监测,对伸臂桁架弦杆进行应力监测,为施工单位提供提前闭合伸臂桁架的依据和建议,研究了根据监测结果控制伸臂桁架附加应力的监控方法,对指导其他超高层的施工具有很高的参考价值。研究了巨型斜撑闭合时间和顺序及监控方法。玻璃幕墙的安装和巨型斜撑的安装出现了矛盾,本文分析了施工过程中巨型斜撑预留缝宽度的变化规律,对其进行了现场位移监测,明确了提前闭合巨型斜撑的可能性,并在闭合后对其应力进行现场监测,检验了提前闭合巨型斜撑的合理性,研究了根据监测结果控制巨型斜撑附加应力的监控方法。提前闭合了巨型斜撑明显加快了施工进度,具有很高的经济效益。同时,研究了基础沉降和重力作用对巨型斜撑应力的影响。
[Abstract]:Under the action of concrete shrinkage creep and so on the super-tall structure will produce obvious vertical deformation. The excessive vertical deformation difference will affect the safety of the construction process and the applicability of the application stage. Cantilever truss and giant oblique brace are important lateral force resistant members of super high-rise structures, and their installation order will affect the seismic performance of the structures after completion. How to close the cantilever truss and giant inclined braces in advance is an urgent engineering problem in the construction of super high-rise structures. In this paper, the vertical deformation of the super high-rise structure is analyzed, the closing time and sequence of the cantilever truss and giant inclined brace are analyzed, and the field monitoring is carried out on the background of the Ping an International Financial Center of Shenzhen, the first high-rise building in China, which is under construction. The monitoring method of additional stress is studied. The influence factors of vertical deformation and the reserve compensation are studied. Considering the shrinkage and creep of concrete, the construction process of super high-rise structure is simulated and analyzed by Midas / Gen, and the variation law of the reserved elevation of floor and the reserved length of vertical members along the height of the structure is studied. Super-high-rise construction is complex and lasting for a long time, which has the risk of shutdown. The effects of shutdown, construction speed and the number of core tube in advance on the vertical deformation and vertical deformation difference of the structure are studied. Furthermore, when these factors are inconsistent with the previous ones, the optimal adjustment of the reservation compensation is studied. The closing time and sequence of extension truss and its monitoring method are studied. Closing the cantilever truss in advance can enhance the stability of the structure in construction, but the extension truss will produce additional stress, which should be taken into account in construction. From the point of view of the vertical deformation difference of the floor where the arm truss is located, the reasonable installation time and sequence of the inclined web and chord of the extended arm truss are studied. At the same time, displacement monitoring is carried out on the oblique web joint of the cantilever truss and stress monitoring on the chord of the cantilever truss is carried out at the same time, which provides the basis and suggestion for the construction unit to close the cantilever truss in advance. The monitoring method for controlling the additional stress of the extension truss based on the monitoring results is studied, which has a high reference value for guiding the construction of other super high-rise buildings. The closing time, sequence and monitoring method of giant diagonal brace are studied. There are contradictions between the installation of glass curtain wall and the installation of giant inclined brace. In this paper, the variation law of the width of reserved joint of giant inclined brace during construction is analyzed, and the field displacement monitoring is carried out, and the possibility of closing giant diagonal brace in advance is clarified. The stress of giant diagonal brace is monitored after closure, and the rationality of closing giant diagonal brace in advance is tested, and the method of controlling the additional stress of giant diagonal brace according to the monitoring results is studied. Closing the giant diagonal brace in advance obviously speeds up the construction progress and has high economic benefit. At the same time, the influence of foundation settlement and gravity on the stress of giant diagonal brace is studied.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU974

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