大跨钢结构施工卸载过程力学分析

发布时间：2018-06-02 09:54

本文选题：卸载方法 + 临时支撑　；参考：《南昌大学》2011年硕士论文

【摘要】：钢结构作为一种古老而又充满活力的材料随着我国钢铁的产业带来了翻天覆地变化。加之我国承办各类国际国内大型体育运动会或者展览会,越来越多的体育场结构和会展场馆不断建成。大跨度空间钢结构完美的实现了大型公共活动的使用要求,不仅仅是从建筑美学方面,而且也能满足力学的要求。但是值得发现的是,现阶段大跨空间结构面临着施工方法的多元化和复杂化,造成施工阶段时结构的内力分布较为复杂,设计使用的主体结构受力随着施工过程不断变化。施工阶段最为关键也是最后实施的步骤即为临时支撑的卸载。临时支撑的卸除过程会导致主体结构内力不断重分布,给结构在施工中的安全带来危险性,所以有必要针对大跨度空间结构进行全过程的卸载过程的模拟,了解不同施工方法下卸载过程的应力变化规律。本论文以某体育馆建设为研究的背景,通过有限元ANSYS软件对其进行建模和卸载过程模拟。该论文主要作了以下几个方面的研究： (1)采用等效的思想把大型大跨空间结构归类于用联系杆连接起来的多跨梁体系,并采用不同的卸载方法对此等效体系进行卸载模拟研究。用简单的形式算出的有限元结构来指导实际施工过程。通过评价指标的建立可获得卸载可靠度指标。 (2)对空间网架进行施工阶段的弹性受力分析,得到网架结构在卸载过程中主体构件的内力分布与大小变化。并从数值上判断了四种卸载方式的优劣,研究了不同卸载方式对主体结构应力重分布和变形的影响。 (3)采用有有限元分析软件,建立实际体育场的模型,考虑不同的卸载方式模拟施工情况。采用几何非线性分析理论对临时支撑胎架体系分别进行特征值屈曲分析和带缺陷的几何非线性分析,判断所用的临时支撑胎架体系的整体稳定性情况。研究不同的材料属性变化影响下的胎架结构稳定性能。
[Abstract]:As an old and energetic material, steel structure has brought great changes along with the steel industry in China. In addition, China hosts all kinds of international and domestic sports games or exhibitions, more and more stadium structures and exhibition venues are constantly built. The large span space steel structure perfectly realizes the use requirement of large-scale public activities, not only from the aspect of architectural aesthetics, but also to meet the requirements of mechanics. However, it is worth discovering that at present, the large-span spatial structure is facing the diversification and complication of construction methods, which results in the complex distribution of internal force of the structure during the construction stage, and the force of the main structure used in the design is constantly changing with the construction process. The most critical and final stage of construction is the unloading of temporary support. The unloading process of temporary braces will lead to the redistribution of the internal forces of the main structure, which will bring danger to the safety of the structure in construction. So it is necessary to simulate the whole process of unloading for the long-span spatial structure. Understand the stress variation law of unloading process under different construction methods. In this paper, based on the background of the construction of a gymnasium, the finite element ANSYS software is used to model and simulate the unloading process of the gymnasium. This paper mainly makes the following aspects of research: 1) the large span spatial structures are classified into multi-span beam systems connected with connecting rods by using the equivalent idea, and the unloading simulation of this equivalent system is carried out by using different unloading methods. The finite element structure is calculated in simple form to guide the actual construction process. The unload reliability index can be obtained by establishing the evaluation index. 2) the elastic force distribution and size change of the main components of the space truss during the unloading process are obtained by analyzing the elastic force of the space truss in the construction stage. The advantages and disadvantages of the four unloading modes are judged numerically, and the effects of different unloading modes on the stress redistribution and deformation of the main structure are studied. Using finite element analysis software, the model of the actual stadium is established, and different unloading modes are considered to simulate the construction situation. The geometric nonlinear analysis theory is used to analyze the eigenvalue buckling and geometric nonlinearity with defects of the temporary braced tire frame system, respectively, and to judge the overall stability of the temporary braced tire frame system. The stability of the tread structure under the influence of different material properties was studied.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TU391

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