巨型框架—核心筒—环形伸臂桁架超高层结构施工过程模拟分析

发布时间：2018-01-14 11:15

本文关键词：巨型框架—核心筒—环形伸臂桁架超高层结构施工过程模拟分析　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：由于我国经济和技术的不断发展,超高层建筑的使用日益广泛。在超高层建筑结构当中,巨型框架-核心筒-环形伸臂桁架结构体系的运用开始普遍,成为现代超高层建筑中使用较多的结构之一。通常超高层结构的研究主要集中于结构自身的力学特性和设计方法,对于结构的施工过程研究相对较少。但是,由于超高层建筑的结构体型复杂、施工周期长、施工质量要求较高,超高层结构的施工过程模拟日益受到重视,并且日趋势在必行。本文以天津市诺德英蓝国际金融中心项目为背景,运用SAP2000有限元分析软件对结构进行施工过程模拟分析,通过对比不同因素对结构施工过程模拟结果的影响,分析施工过程中需要注意的问题,为超高层巨型框架-核心筒-环形伸臂桁架结构的施工提供有益的参考,本文主要进行了以下几项工作:1.对巨型框架-核心筒-环形伸臂桁架的整体结构,运用SAP2000有限元分析软件进行有限元模型的建立,并对施工过程分析模型的建立方式和过程进行了叙述,形成了较为完整的施工过程模拟建模方案。通过与施工监测数据的对比,验证施工过程模拟分析模型的正确性,并分析误差产生的原因。2.对施工过程模拟分析的加载方式进行理论分析。运用有限元模型对巨型框架-核心筒-环形伸臂桁架结构进行不同加载方式的施工过程模拟,通过对比不同加载方式对结构竖向位移、竖向位移差以及核心筒竖向应力的影响,分析不同加载方式的对结构施工过程的影响。结论表明,精确施工过程加载法更接近实际情况,在施工过程模拟时应采用精确施工过程加载法。3.从理论上分析筒体领先施工的必要性,分析现有筒体领先施工层数的计算方法。运用施工过程模拟不同筒体领先层数,通过对比结构的竖向位移和竖向应力的不同变化,分析得出筒体领先施工可以有效的减小不同结构的竖向位移差。对于64层的超高层结构,领先施工8-12层较为合理。4.通过改变桁架连接顺序、对比结构竖向位移,研究施工中较为合理的桁架连接顺序;研究塔吊设备对结构竖向位移的影响。结果表明,对于桁架结构最后连接,桁架结构在施工过程中连接可以协调结构的竖向位移,但会对桁架结构产生较大的次生力,需要注意施工过程中桁架结构的受力问题;塔吊设备对结构的竖向位移影响不大,可以在施工过程模拟中进行简化计算。5.通过理论分析收缩和徐变系数的计算方法及其对结构的影响,并在施工过程模拟计算中分别考虑收缩和徐变的影响。通过对比结构竖向位移和竖向应力,得到结论:在施工过程模拟分析中,收缩和徐变对巨型框架-核心筒-环形伸臂桁架结构的竖向位移和竖向位移差影响较大,所以在进行施工过程模拟时不应忽略其影响,并应在施工过程中充分考虑和减弱收缩徐变带来的影响。
[Abstract]:Due to the continuous development of China's economy and technology, the use of super high-rise building is more and more widely. In super high-rise buildings, the use of mega frame core tube - ring cantilever truss structure system to become one of the more common use of modern structure in high-rise buildings. The mechanical properties and design method through study of Chang Chao mainly focused on high-rise structure the structure of its own, for the study of the construction process is relatively small. However, due to the high-rise building complex, long construction period, the construction of high quality, simulation is paid more and more attention to the construction process of the high-rise structure, and on the trend in the imperative. Based on the background of Tianjin city Nord Winland international financial center project. Simulation analysis of construction process of structure using finite element analysis software SAP2000, the simulation results of the construction process through the comparison of different factors Impact analysis of the need to pay attention to in the construction process, provide a useful reference for the construction of super high-rise mega frame core tube - ring cantilever truss structure, this paper carried out the following work: 1. of the mega frame corewall outrigger truss ring structure, transport finite element model is established by using SAP2000 finite element the analysis software, and the construction process analysis model and process are described, forming a more complete modeling scheme to simulate the construction process. By comparing with the construction monitoring data, the correctness of the analytical model simulation of construction process, and analyzes the causes of the error of.2. to analyze the construction process simulation analysis loading. By using the finite element model to simulate the construction process of different loading modes on the mega frame core tube - ring cantilever truss structure, through the comparison of different The displacement of loading on the structure of the vertical stress, vertical displacement and vertical tube, analysis of different loading methods on the structure of the construction process. The conclusion shows that the effect of the construction process, accurate loading method is closer to the actual situation in the construction process, construction process simulation should be used when the exact loading method of.3. analysis of the necessity of leading tube construction from the theoretical analysis, the existing calculation methods of cylinder leading construction layers. With the construction process simulation of different cylinder leading layers, different changes through the vertical displacement and vertical comparison of structure stress analysis, the tube leading construction can effectively reduce the vertical displacement of different structures. For the 64 storey high-rise structure 8-12, the leading construction layer is more reasonable by changing the order of.4. truss, vertical comparison of the displacement of structure, reasonable construction sequence of truss crane design; research Effect of vertical displacement of the structure. The results show that for the last connected truss, truss structure can connect vertical displacement coordination structure in the construction process, but will be larger Miguel truss structure, the truss structure construction process need to pay attention to the stress problem of small crane; vertical displacement structure.5., can simplify the calculation method of shrinkage and creep coefficient is analyzed by theory and its influence on the structure in the construction process simulation, and in the construction process simulation calculation of shrinkage and creep are considered. The influence of vertical displacement and vertical comparison of structure stress, get the conclusion: in the analysis of construction process simulation, shrinkage and creep to the mega frame core tube and the annular cantilever truss structure of vertical displacement and vertical displacement difference influence, so in the construction process simulation should not be ignored The effect of shrinkage and creep should be fully considered and weakened during the construction process.

【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU974

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