超高层建筑施工数值模拟与监测研究

发布时间：2019-04-08 14:53

【摘要】：因为超高层建筑的结构形式独特,结构设计难度大以及施工过程的复杂性等特点,使得超高层建筑在整个建设过程中面临着巨大的挑战。施工过程中结构整体刚度、荷载和应力都在不断发生变化,结构内部受力复杂;在使用阶段,结构在遭受外力作用如台风和地震作用时会产生一定的损伤,造成结构强度降低,带来一定的安全隐患,施工期间和使用阶段结构的安全性越来越受到关注。运用数值模拟和结构健康监测两者相结合的方法对超高层建筑施工全过程中结构的变形和受力状态进行监测和评估,优化施工方案并确保施工安全有序进行,具有重要的意义。本文首先介绍了超高层建筑结构健康监测系统和研究现状。然后利用深圳平安金融中心的结构健康监测平台,对塔楼的关键构件进行了施工阶段全过程模拟分析,并将实测数据与模拟进行对比,主要内容如下:对平安金融中心进行竖向变形模拟分析,探讨施工期间和使用阶段长期荷载效应下核心筒和巨柱的累积竖向变形发展规律,并研究是否考虑收缩徐变、考虑施工过程等对结构竖向变形的影响。分析结果说明不考虑收缩徐变和一次性加载的模拟将严重低估竖向变形结果,超高层建筑在施工过程分析应注意考虑收缩徐变和施工过程对竖向变形的影响。研究了平安金融中心的核心筒型钢柱、核心筒剪力墙和巨柱以及带状桁架和伸臂桁架杆件在施工阶段的内力和应力变化情况,并分析了收缩徐变对构件应力的影响。结果表明,收缩徐变对钢结构的应力变化影响相对较大,不可忽略其影响,设计中应予以考虑;桁架构件中的弦杆在施工过程中受力变化较稳定,腹杆受力变化较大,且受收缩徐变影响也较大。结合现场实测数据和有限元模拟数据进行对比分析,核心筒和巨柱的竖向变形和应力数据对比结果较为吻合,而桁架钢结构受温度影响大,部分数据对比结果相差较大。主要由于有限元模拟与现场实际施工环境状况存在一定差别,并且数据采集时容易受到环境因素的干扰而导致部分数据不准确。总的来说,本文提出的数值模型可以提供和现场实测一致的结果,对施工过程优化和结构安全都具有重要的意义。
[Abstract]:Because of the unique structural form, the difficulty of structural design and the complexity of the construction process, the super-high-rise building faces great challenges in the whole construction process. During the construction process, the overall stiffness, load and stress of the structure are constantly changing, and the internal stress of the structure is complicated. In the use stage, when the structure is subjected to external forces such as typhoon and earthquake, it will cause certain damage, reduce the strength of the structure and bring a certain hidden danger of safety. The safety of the structure during construction and service period has been paid more and more attention. It is of great significance to monitor and evaluate the deformation and stress state of the structure in the whole process of super-high-rise building construction by means of the combination of numerical simulation and structural health monitoring, in order to optimize the construction scheme and ensure the safe and orderly construction of the super-high-rise building. This paper first introduces the super-high-rise building structural health monitoring system and research status. Then the structural health monitoring platform of Shenzhen Ping'an Financial Center is used to simulate and analyze the whole process of the key components of the tower during the construction phase, and the measured data are compared with the simulation. The main contents are as follows: the vertical deformation of Ping an Financial Center is simulated and analyzed, the accumulative vertical deformation law of core tube and giant column under long-term load effect during construction and service period is discussed, and whether shrinkage and creep is considered is studied. The influence of the construction process on the vertical deformation of the structure is considered. The analysis results show that the vertical deformation results will be seriously underestimated without consideration of shrinkage creep and one-time loading. In the construction process analysis of super-high-rise buildings the effects of shrinkage and creep and construction process on vertical deformation should be taken into account. In this paper, the internal force and stress changes of core tube steel columns, core tube shear walls and giant columns, strip trusses and extended arm trusses in the construction stage of Ping an Financial Center are studied, and the influence of shrinkage and creep on the stress of the components is analyzed. The results show that the influence of shrinkage and creep on the stress change of steel structure is relatively large and should not be ignored, which should be considered in the design. In the course of construction, the chords in truss members have a stable change in stress, a great change in force on the web, and a great influence on the shrinkage and creep of the web members. Compared with the field measured data and finite element simulation data, the comparison results of vertical deformation and stress between core cylinder and giant column are more consistent, while the truss steel structure is greatly affected by temperature, and some of the data are different from each other. There are some differences between the finite element simulation and the actual construction environment, and the data collection is easily interfered by the environmental factors, which leads to the inaccuracy of some data. In general, the numerical model presented in this paper can provide the same results as in-situ measurements, which is of great significance to the optimization of construction process and the safety of structures.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU974

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