- 摘 要
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(北京市建筑設(shè)計研究院有限公司， 北京 100045)
［摘要］介紹了江門中微子實驗（JUNO）中心探測器主體不銹鋼結(jié)構(gòu)的結(jié)構(gòu)體系，闡述了結(jié)構(gòu)在巨大浮力作用下的整體穩(wěn)定性問題及失穩(wěn)模式，并針對結(jié)構(gòu)的特點提出了結(jié)構(gòu)整體穩(wěn)定性評價標準。通過對一系列模型的穩(wěn)定性分析和對比發(fā)現(xiàn)結(jié)構(gòu)主要的失穩(wěn)形式是有機玻璃球在浮力作用下的整體旋轉(zhuǎn)上升。與不銹鋼網(wǎng)殼剛接的撐桿的數(shù)目和位置是影響結(jié)構(gòu)整體穩(wěn)定性的重要因素。所有撐桿兩端均鉸接的方案存在提前失穩(wěn)的風險。有機玻璃球的初始整體旋轉(zhuǎn)、撐桿與有機玻璃球表面不完全垂直等初始缺陷會一定程度上削弱結(jié)構(gòu)的整體穩(wěn)定性。隨著撐桿隨機偏轉(zhuǎn)角標準差的增加，結(jié)構(gòu)整體穩(wěn)定性呈緩慢降低的趨勢。根據(jù)分析結(jié)果，結(jié)構(gòu)考慮初始缺陷的雙非線性穩(wěn)定承載力系數(shù)可取3.35，滿足設(shè)計要求。
［關(guān)鍵詞］江門中微子實驗；有機玻璃球；不銹鋼；單層網(wǎng)殼；穩(wěn)定性；浮力；初始缺陷
中圖分類號：TU973,TU311-2 文獻標識碼：A文章編號：1002-848X(2021)20-0076-06
Research on the global stability of the central detector structure of Jiangmen Underground Neutrino Observatory (JUNO) under buoyancy
LI Huafeng
(Beijing Institute of Architectural Design, Beijing 100045， China)
Abstract: The structural system of the main stainless steel structure of Jiangmen Underground Neutrino Observatory (JUNO) central detector was introduced, the global stability problem and instability mode of the structure under the huge buoyancy were expounded, and the evaluation standard of the global stability of the structure was proposed according to the characteristics of the structure. Through analysis and comparison on the results of stability analysis of a series of model, found that the main form of instability mode was the revolving rising of the acrylic vessel under buoyancy. The number and location of the bars rigidly connecting the stainless steel shell has a great influence on the structural global stability. There is a risk of early instability in the structural system where both ends of all bars are hinged. The global stability will be weakened to a certain extent by the initial defects, such as the initial overall rotation of the acrylic vessel,the bars and surface of the arcylic vessel were not completely perpendicular, etc. With the increase of standard deviation of the random deflection angle of the bars, the global stability decreases slightly. The binonlinear stability bearing capacity coefficient of the structure considering the initial defect can be 3.35, meeting the design requirements.
Keywords:Jiangmen Underground Neutrino Observatory (JUNO)； acrylic vessel； stainless steel； single layer shell； stability； buoyancy； initial defect
作者簡介：李華峰，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師，Email：328310827@qq.com。
