蜂窝网格型球面巨型网壳形体、静力与稳定性研究

发布时间：2018-05-16 12:29

本文选题：巨型网壳 + 形体参数　；参考：《湖南大学》2015年硕士论文

【摘要】：网壳结构向超大跨度发展是社会的迫切需求和建筑科技水平的集中体现,巨型网格结构体系能够解决网壳结构跨度过大时受力性能不良的问题。本文结合巨型网格结构体系的概念,提出了一种新的结构形式——蜂窝网格型球面巨型网壳,并对其形体的几何构成、静力性能、稳定性等方面进行了较为全面地研究,主要包括以下部分:分析了主体结构的几何构型、形体控制参数和支承方式;描述了子结构的具体形式——抽空三角锥平板网架子结构及其在主体结构上的支承方式;详细分析了主体结构自动生成程序的实现过程,为对该结构的力学性能展开全面系统地研究提供了极大的方便。考虑主体结构单独承载及其与子结构协同承载两种情况,全面系统地研究了结构的静力性能,包括主体结构及子结构的内力分布情况及一系列参数分析,了解了结构的内力分布规律、主要控制参数对结构静力性能的影响及取值规律。重点研究了蜂窝网格型球面巨型网壳的几何非线性稳定性能。分析了结构的失稳模态,找到了结构失稳的薄弱部位;对结构的极限承载力进行了一系列参数分析,并研究了不同主体结构及子结构支承条件对极限承载力的影响。进一步比较分析了初始几何缺陷和荷载不对称分布对结构极限承载力的影响,了解了各种情况下结构的实际承载力;对结构的破坏条件进行了探讨,发现绝大多数情况下,结构的破坏是由强度条件控制。基于冗余度和敏感性指标的计算方法,研究了结构由于偶然因素导致任意的部分杆件失效后,结构稳定极限承载力的受影响程度及抗连续倒塌的能力。考察了单杆破坏和节点破坏两种情况,找到了结构的关键杆件和节点所在区域,提出了提高结构冗余度的具体措施并分析了不同措施的效果。通过以上研究以期为实际工程提高理论参考。
[Abstract]:The development of latticed shell structure to large span is the urgent need of society and the concentrated embodiment of building science and technology level. The mega grid structure system can solve the problem of poor mechanical performance when the span of latticed shell structure is too long. Based on the concept of mega grid structure system, a new type of honeycomb reticulated spherical reticulated shell is proposed in this paper, and its geometric structure, static performance and stability are studied in detail. The main contents are as follows: the geometric configuration, shape control parameters and supporting mode of the main body structure are analyzed, the concrete form of the substructure is described, and the structure of the triangular cone net frame and its supporting mode on the main body structure are described. The realization process of the automatic generating program for the main body structure is analyzed in detail, which provides great convenience for the comprehensive and systematic study of the mechanical properties of the structure. In this paper, the static performance of the main structure, including the distribution of the internal force of the main structure and its substructure and a series of parameter analysis, are studied comprehensively and systematically, considering the individual bearing capacity of the main structure and its cooperation with the substructure. The distribution law of internal force and the influence of main control parameters on the static performance of the structure are understood. The geometric nonlinear stability of honeycomb reticulated spherical giant reticulated shell is studied in detail. The failure mode of the structure is analyzed, the weak position of the structure is found, a series of parameter analysis of the ultimate bearing capacity of the structure is carried out, and the influence of the supporting conditions of different main structures and substructures on the ultimate bearing capacity is studied. The effects of initial geometric defects and load asymmetry distribution on the ultimate bearing capacity of the structure are further compared and analyzed, the actual bearing capacity of the structure under various conditions is understood, and the failure conditions of the structure are discussed, and it is found that in most cases, The failure of the structure is controlled by the strength condition. Based on the calculation method of redundancy and sensitivity index, the influence degree of ultimate bearing capacity of structure and its ability to resist continuous collapse are studied after arbitrary member failure caused by accidental factors. Two cases of single bar failure and joint failure are investigated, the key members and the joint area of the structure are found, the concrete measures to improve the redundancy of the structure are put forward and the effects of different measures are analyzed. Through the above research, we hope to improve the theoretical reference for practical engineering.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399

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