塔机结构非线性分析及高强度板承载能力研究

发布时间：2018-01-15 22:01

本文关键词：塔机结构非线性分析及高强度板承载能力研究　出处：《太原科技大学》2017年硕士论文　论文类型：学位论文

更多相关文章： 非线性 风载荷 高强度 临界载荷

【摘要】：塔式起重机凭借起升高度高、回转半径大,安装拆卸方便的特点,在建筑行业得到广泛应用,己成为建筑行业中常用的施工设备。由于塔式起重机这种高耸结构在室外工作运行,随着塔身高度逐渐增加,风载荷的影响越发复杂,风压高度变化系数随地面高度变化呈指数分布变化规律,结构非线性变形也越发明显,这种影响不同程度地体现于工作状态及非工作状态下的塔机,主要体现于非工作状态下的塔机。鉴于以上背景,本文考虑到风载荷对高耸结构的非线性变形,按照风载荷随塔身高度增大的变化规律,区别于将风载荷简化为一定间距内的均布载荷的传统计算方法,将其等效为从塔身顶部至底部逐渐减小的梯形非均布荷载,推导非均布风载荷下塔机塔身顶端水平位移非线性计算公式;利用有限元分析方法完成了TC5613塔式起重机在非工作状态下三种不同支撑形式时的塔式起重机整体分析,分别研究了线性和非线性对塔身静强度和静刚度的影响,校核其静刚度以及塔机静强度,在此基础上,考虑了几何非线性因素,分析了不同工况下塔机静强度以及静位移。并与给出的理论公式计算值进行对比分析,得出结论:几何非线性是影响塔机静强度值的主要因素;并伴随着塔身高度的增加越发突出。目前高强度板起重机上的应用方面处于初期,针对高强度板受压屈曲稳定性的研究尚无新的计算理论和计算方法。虽然高强度钢材的相关设计理论在《钢结构设计规范》中有所提及,但还没有相应的实验和数据分析研究做支撑,大多研究停留在普通强度板的受压稳定性,高强度板的受压稳定性还属于空白领域亟待通过大量模拟数据为研究提供数据支撑。因此,本文对四种不同屈服强度、不同板厚、不同筋条尺寸的四边简支高强度薄板进行有限元分析,探究其屈曲临界载荷变化情况与薄板宽厚比、筋条尺寸的关系。论文最后对研究结论进行了总结,并指出了当前研究工作的不足之处以及下一步研究工作的方向及预期达到的效果。
[Abstract]:Tower crane is widely used in the construction industry because of its high lifting height, large radius of rotation and convenient installation and disassembly. Tower crane has become a common construction equipment in the construction industry. With the tower height increasing, the influence of wind load becomes more and more complex because of the tower crane which works outdoors. The coefficient of variation of wind pressure height varies exponentially with the change of ground height, and the nonlinear deformation of the structure becomes more and more obvious, which is reflected in the tower crane under the working state and the non-working state to varying degrees. In view of the above background, considering the nonlinear deformation of the wind load to the towering structure, according to the law of the wind load increasing with the tower height. It is different from the traditional calculation method which simplifies the wind load to the uniform load within a certain distance, which is equivalent to the trapezoidal non-uniform load which gradually decreases from the top to the bottom of the tower. The nonlinear calculation formula of horizontal displacement at the top of tower body of tower crane under non-uniform wind load is derived. Using the finite element analysis method, the whole analysis of tower crane with TC5613 tower crane under three different support forms under non-working condition is completed. The effects of linearity and nonlinearity on the static strength and stiffness of the tower are studied, and the static stiffness and the static strength of the tower crane are checked. On this basis, the geometric nonlinear factors are considered. The static strength and displacement of tower crane under different working conditions are analyzed and compared with the calculated values of theoretical formula. It is concluded that geometric nonlinearity is the main factor affecting the static strength of tower crane; With the increase of tower height, the application of high strength plate crane is in the initial stage. There is no new calculation theory and calculation method for the buckling stability of high strength plates under compression, although the related design theory of high strength steel is mentioned in the Code for Design of Steel structures. However, there is no corresponding experimental and data analysis research to support, most of the research stay on the compressive stability of the ordinary strength plate. The compressive stability of high strength plate is also a blank field, which needs to be supported by a large number of simulation data. Therefore, this paper studies four different yield strength, different plate thickness. The finite element analysis is carried out on the four sides simply supported high strength thin plates with different sizes of bars, and the relationship between the buckling critical load and the ratio of width to thickness of thin plates and the size of steel bars is explored. Finally, the conclusions of the research are summarized. It also points out the shortcomings of the current research work, the direction of the next research work and the expected results.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH213.3

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