多层长悬臂钢结构施工过程模拟与监测研究

发布时间：2018-11-25 14:49

【摘要】：随着建筑结构技术的不断发展,许多新颖奇特的建筑类型已经涌现在我们眼前,本文所研究的长悬臂钢结构就属于其中的一种。在长悬臂结构在施工过程中往往需要搭设临时支撑,而结构体系将在临时支撑的拆除过程中发生转换。所以为了保证长悬臂结构施工过程的安全与可行并且使结构位形的设计值能够被得到满足,有必要对结构的施工过程做出数值模拟与现场监测。本文以某长悬臂钢结构为对象,主要做了以下三方面的研究:首先在比较不同临时支撑结构类型的基础上,设计了一种整体排架式的临时支撑结构。该种类型的临时支撑结构具有整体刚度和稳定性较高,便于安装与施工等特点。通过数值模拟分析,得出了临时支撑结构内力和变形的最大位置,失稳模态与自振周期,确保了该临时支撑结构的安全和稳定。其次采用有限元软件Midas/Civil,对该长悬臂钢结构的施工全过程进行了模拟分析,将施工过程划分为了16个子阶段,分析了各阶段中截面应力和竖向挠度最大的位置。最后对结构的关键位置进行了现场施工监测。通过将数值模拟计算值与现场实测值进行对比,发现二者能够较好地吻合,这表明本文所采用的数值模拟方法是正确可行的。本文的研究成果,对今后类似的长悬臂结构施工过程的分析与应用有一定的参考价值和指导意义。
[Abstract]:With the continuous development of building structure technology, many novel and peculiar architectural types have emerged in front of our eyes. The long cantilever steel structure studied in this paper belongs to one of them. In the construction of long cantilever structure, temporary support is often needed, and the structure system will be transformed during the demolition of temporary bracing. So in order to ensure the safety and feasibility of the long cantilever structure construction process and make the design value of the structure configuration can be satisfied, it is necessary to make numerical simulation and on-site monitoring of the construction process of the structure. In this paper, a long cantilever steel structure is taken as an object, which is mainly studied in the following three aspects: firstly, on the basis of comparing the different types of temporary bracing structure, a kind of temporary bracing structure with integral bent frame is designed. This kind of temporary support structure has the characteristics of high overall stiffness and stability, easy installation and construction. Through numerical simulation and analysis, the maximum position of internal force and deformation, instability mode and natural vibration period of temporary bracing structure are obtained, which ensures the safety and stability of the temporary bracing structure. Secondly, the whole construction process of the long cantilever steel structure is simulated and analyzed by using the finite element software Midas/Civil,. The construction process is divided into 16 sub-stages, and the position of maximum cross-section stress and vertical deflection in each stage is analyzed. Finally, site construction monitoring is carried out on the key position of the structure. By comparing the numerical simulation results with the field measured values, it is found that the two methods are in good agreement with each other, which shows that the numerical simulation method used in this paper is correct and feasible. The research results of this paper have certain reference value and guiding significance for the analysis and application of similar long cantilever structure construction process in the future.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU758.11

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