本文選題：巨型網(wǎng)殼 + 形體參數(shù)　； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：網(wǎng)殼結(jié)構(gòu)向超大跨度發(fā)展是社會的迫切需求和建筑科技水平的集中體現(xiàn),巨型網(wǎng)格結(jié)構(gòu)體系能夠解決網(wǎng)殼結(jié)構(gòu)跨度過大時受力性能不良的問題。本文結(jié)合巨型網(wǎng)格結(jié)構(gòu)體系的概念,提出了一種新的結(jié)構(gòu)形式——蜂窩網(wǎng)格型球面巨型網(wǎng)殼,并對其形體的幾何構(gòu)成、靜力性能、穩(wěn)定性等方面進行了較為全面地研究,主要包括以下部分:分析了主體結(jié)構(gòu)的幾何構(gòu)型、形體控制參數(shù)和支承方式;描述了子結(jié)構(gòu)的具體形式——抽空三角錐平板網(wǎng)架子結(jié)構(gòu)及其在主體結(jié)構(gòu)上的支承方式;詳細分析了主體結(jié)構(gòu)自動生成程序的實現(xiàn)過程,為對該結(jié)構(gòu)的力學(xué)性能展開全面系統(tǒng)地研究提供了極大的方便�？紤]主體結(jié)構(gòu)單獨承載及其與子結(jié)構(gòu)協(xié)同承載兩種情況,全面系統(tǒng)地研究了結(jié)構(gòu)的靜力性能,包括主體結(jié)構(gòu)及子結(jié)構(gòu)的內(nèi)力分布情況及一系列參數(shù)分析,了解了結(jié)構(gòu)的內(nèi)力分布規(guī)律、主要控制參數(shù)對結(jié)構(gòu)靜力性能的影響及取值規(guī)律。重點研究了蜂窩網(wǎng)格型球面巨型網(wǎng)殼的幾何非線性穩(wěn)定性能。分析了結(jié)構(gòu)的失穩(wěn)模態(tài),找到了結(jié)構(gòu)失穩(wěn)的薄弱部位;對結(jié)構(gòu)的極限承載力進行了一系列參數(shù)分析,并研究了不同主體結(jié)構(gòu)及子結(jié)構(gòu)支承條件對極限承載力的影響。進一步比較分析了初始幾何缺陷和荷載不對稱分布對結(jié)構(gòu)極限承載力的影響,了解了各種情況下結(jié)構(gòu)的實際承載力;對結(jié)構(gòu)的破壞條件進行了探討,發(fā)現(xiàn)絕大多數(shù)情況下,結(jié)構(gòu)的破壞是由強度條件控制。基于冗余度和敏感性指標的計算方法,研究了結(jié)構(gòu)由于偶然因素導(dǎo)致任意的部分桿件失效后,結(jié)構(gòu)穩(wěn)定極限承載力的受影響程度及抗連續(xù)倒塌的能力�？疾炝藛螚U破壞和節(jié)點破壞兩種情況,找到了結(jié)構(gòu)的關(guān)鍵桿件和節(jié)點所在區(qū)域,提出了提高結(jié)構(gòu)冗余度的具體措施并分析了不同措施的效果。通過以上研究以期為實際工程提高理論參考。
[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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU399

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