800m超大跨凯威特型巨型网格结构静力及稳定性研究

发布时间：2018-01-25 14:12

本文关键词： 超大跨凯威特型巨型网格自动生成稳定分析参数分析　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着社会进步和建设水平的发展,超大跨空间结构在抵御环境变化、营造宜居区域、城市节能减排等方面有着越来越广的应用前景,受到学者们的广泛重视。由于结构跨度上的大幅度增加,必将很大程度上提高结构杆件数目、杆件尺寸等,直接导致结构在内力计算、杆件选择、稳定分析等方面面临诸多未知与挑战。本文以提出合理的800m超大跨结构为研究目标,对比分析了四种备选超大跨结构形式,筛选出其中受力性能最优的凯威特型巨型网格作为本课题的研究对象。首次得到其自动生成程序并对其进行了系统的静力分析、稳定分析、参数分析和子结构分析。从而为该结构的理论研究与工程设计提供有价值的参考。主要包含以下几方面内容:1、对比分析了800m跨度、一致荷载作用下的双层网壳、局部三层网壳、肋环型巨型网格和凯威特型巨型网格的内力峰值、最大位移、用钢量等静力性能指标。筛选出最合理的结构形式——凯威特型巨型网格。并从结构构造特点、受力原理等方面对其原因进行了分析。2、利用CAD三维建模进行成型分析并得到凯威特型巨型网格结构的拓扑关系,提出了基于几何成型的结构程序化实现方法。利用APDL参数化语言结合此结构几何形体控制参数编制其相应的自动生成程序,为该结构的深入研究奠定了良好的基础。3、编制了适用于凯威特型巨型网格结构的荷载程序、选杆程序,并完成该结构静力计算。总结了对此结构形式起控制作用的荷载工况,总结归纳了此结构的内力分布规律。4、考虑巨型网格节点偏差几何非线性、材料非线性和杆件初始弯曲几何非线性的影响进行结构稳定性分析。提出了双重条件判断整体失稳的方法,并总结了结构整体失稳时各参数的取值规律。利用弧长法追踪结构的平衡路径并编制了相应的非线性稳定分析程序。对此结构在各非线性因素影响下的承载力变化规律进行了归纳总结。通过与其他结构形式对比,并结合此超大跨结构的特点,对上述规律的原因进行了分析。5、研究了各参数变化对结构受力性能的影响,对凯威特型巨型网格结构进行了关于环(径)向分割份数、矢跨比、桁架高跨比等7个参数共计153个模型的分析计算。总结了结构力学性能随上述参数的变化规律,归纳了各参数的合理取值范围,为该结构的深入研究与工程应用提供一定的参考。
[Abstract]:With the development of social progress and construction level, super-large cross-space structure has more and more extensive application prospects in resisting environmental change, creating livable areas, and saving energy and emission reduction in cities. Due to the large increase in the span of the structure, the number of members and the size of the members will be greatly increased, which will directly lead to the calculation of the internal force of the structure and the selection of the members. Stability analysis is faced with many unknown and challenges. In this paper, we propose a reasonable 800m super-span structure as the research goal, and compare and analyze four alternative super-span structures. The Kewitt giant mesh which has the best mechanical performance is selected as the research object of this paper. The automatic generating program is obtained for the first time and the static analysis and stability analysis are carried out systematically. Parameter analysis and substructure analysis, thus providing a valuable reference for the theoretical research and engineering design of the structure. The main contents include the following aspects: 1, and the 800m span is compared and analyzed. The peak internal force and maximum displacement of double-layer reticulated shell, local three-layer latticed shell, rib ring giant mesh and Cavette giant grid under uniform load. The most reasonable structure form, Cavett giant mesh, is selected by using the steel equal static performance index, and the causes are analyzed from the structural characteristics and the stress principle. 2. The CAD 3D modeling is used to analyze the modeling and the topological relationship of the Cavette giant mesh structure is obtained. The programming method of structure based on geometric shaping is put forward, and the corresponding automatic generating program is compiled by using APDL parameterization language combined with the control parameters of the geometric shape of the structure. It lays a good foundation for the further study of the structure. 3. A load program and a rod selection program are developed for the Cavette mega grid structure. The static calculation of the structure is completed. The load conditions that control the structure form are summarized. The internal force distribution law of the structure is summarized. 4. The geometric nonlinearity of the giant grid node deviation is considered. The influence of material nonlinearity and initial bending geometric nonlinearity on structural stability is analyzed. A double condition method for judging global instability is proposed. The method of arc length is used to track the equilibrium path of the structure and a corresponding program for nonlinear stability analysis is developed. The bearing capacity variation of the structure under the influence of various nonlinear factors is also summarized. The law of transformation is summarized and compared with other structural forms. Combined with the characteristics of the super-large span structure, the causes of the above law are analyzed, and the influence of various parameters on the mechanical performance of the structure is studied. This paper deals with the ring (diameter) division number and the rise-to-span ratio of the Cavette giant mesh structure. The analysis and calculation of 153 models with seven parameters such as truss height / span ratio are made. The variation law of structural mechanical properties with the above parameters is summarized and the reasonable value range of each parameter is summarized. It provides a certain reference for the further research and engineering application of the structure.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399

【引证文献】