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（1 華南理工大學(xué)土木與交通學(xué)院， 廣州 510640； 2 深圳華僑城房地產(chǎn)有限公司， 深圳 518053； 3 深圳千典建筑與工程設(shè)計有限公司， 深圳 518053； 4 信息產(chǎn)業(yè)電子第十一設(shè)計研究院科技工程股份有限公司， 成都 610021）
［摘要］某研究機構(gòu)科研樓采用折板式網(wǎng)格與網(wǎng)架組合而成的空間結(jié)構(gòu)，外形類似鉆石體。該結(jié)構(gòu)從中部開始往下內(nèi)收，僅底部周邊有柱腳支承，內(nèi)部無支撐，約束較少，空間關(guān)系復(fù)雜，整體穩(wěn)定性問題突出。利用ANSYS軟件進行特征值屈曲分析，確定結(jié)構(gòu)的初始幾何缺陷分布，進而進行結(jié)構(gòu)的非線性屈曲分析；研究了節(jié)點剛度、結(jié)構(gòu)關(guān)鍵部位對整體穩(wěn)定性能的影響；通過特征值屈曲分析反算了結(jié)構(gòu)主要桿件的計算長度系數(shù)。分析結(jié)果表明：該鉆石體折板式網(wǎng)格結(jié)構(gòu)為對初始缺陷不敏感結(jié)構(gòu)；在D+L工況下，考慮幾何、材料雙重非線性時，結(jié)構(gòu)的臨界荷載系數(shù)約為2-45，滿足規(guī)程要求；節(jié)點的剛度對結(jié)構(gòu)的穩(wěn)定性影響較??；關(guān)鍵部位失效后，也不會發(fā)生結(jié)構(gòu)的整體倒塌，證明了折板式網(wǎng)格是一種穩(wěn)定性較好的空間結(jié)構(gòu)形式。
［關(guān)鍵詞］折板式網(wǎng)格結(jié)構(gòu)； 整體穩(wěn)定性； 雙重非線性分析； 計算長度； 有限元分析
中圖分類號：TU33+9文獻標(biāo)識碼：A文章編號：1002-848X(2016)18-0087-06
Overall stability analysis of a diamond-shaped folded-plate latticed shell structure
Liu Hexing1， Liu Weiya2,3， Deng Yi3， Chen Feng4
(1 School of Civil and Transpotation Engineering， South China University of Technology， Guangzhou 510640， China；2 Shenzhen OCT Properties Co.， Ltd.， Shenzhen 518053， China； 3 Shenzhen Qiandian Architectural & Engineering Designing Co.， Ltd.， Shenzhen 518053， China； 4 The Eleventh Design and Research Institute of Science and Technology Engineering Co., Ltd.， Chengdu 610021， China)
Abstract:One research building of an institute is a diamond-shaped space structure composed of the folded-plate latticed shell structure and the grid structure. The structure trends slender from middle to bottom, only with pedestal bearings surrounding the bottom. There is no internal support and there are few constraints. The structure has complex spatial relationship and the overall stability issue is outstanding. ANSYS software was used to conduct eigenvalue buckling analysis to determine the distribution of initial geometric defects of the structure, and then non-linear buckling analysis was carried out. Influences of joint stiffness and key parts of the structure on overall stability performance were studied. The calculating length coefficient of main rod members of the structure was calculated through eigenvalue buckling analysis. The analysis results show that: the diamond-shaped folded-plate latticed shell structure is not sensitive to the initial geometric defects; under combined working conditions of D+L, critical load coefficient of the structure is about 2-45 when considering double nonlinear of geometry and material, which meets code requirements; impact of node rigidity on the stability of the structure is small; after the failure of key parts, there is no overall collapse, which proves that folded-plate latticed shell structure is a spatial structure with well stability.
Keywords:folded-plate latticed shell structure； overall stability； double nonlinear analysis； effective length； FEA
作者簡介：劉和星，碩士，助理工程師，Email：mars920506@163.com。
