Y形柱穩(wěn)定性分析研究
崔家春1,3，周健2，楊聯(lián)萍1,3，王洪軍2，李承銘1
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崔家春1,3，周健2，楊聯(lián)萍1,3，王洪軍2，李承銘1（1 上?，F(xiàn)代建筑設計（集團）有限公司，上海 200041； 2 華東建筑設計研究院有限公司，上海 200002；3 同濟大學建筑工程系，上海 200092）［摘要］Y形柱是機場航站樓屋蓋支承體系中常采用的一種構件形式，作為主要承重構件，其穩(wěn)定性決定了屋蓋結構的整體承載能力。利用荷載-位移全過程跟蹤技術，考慮幾何非線性、材料非線性和初始幾何缺陷，研究了在豎向和水平風、地震作用下薄壁Y形柱的穩(wěn)定性。研究表明：豎向荷載作用下Y形柱以分叉段平面外屈曲為主要失穩(wěn)模式；Y形柱對初始幾何缺陷不敏感；水平風荷載對Y形柱穩(wěn)定性不起控制作用；豎向和水平荷載作用下，發(fā)生面外失穩(wěn)前柱子分叉處已經進入塑性變形，柱子強度問題先于整體失穩(wěn)。［關鍵詞］Y形柱；整體穩(wěn)定；非線性分析；初始幾何缺陷中圖分類號：TU311-2，TU393-3文獻標識碼：A文章編號：1002-848X(2012)05-0115-04Analysis and research on stability of Y-shaped columnsCui Jiachun1,3, Zhou Jian2, Yang Lianping1,3, Wang Hongjun2, Li Chengming1(1 Shanghai Xian Dai Architectural Design (Group) Co., Ltd., Shanghai 200041, China; 2 East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China; 3 Department of Building Engineering, TongjiUniversity, Shanghai 200092, China)Abstract: Y-shaped column is common used as the main resistant structural system for roof in airports. As the main load bearing component, its stable capability directly affect the overall load bearing capability of the roof. Considering geometrical nonlinear, material nonlinear and initial geometrical imperfection, the stability performance of Y-shaped column under vertical and horizontal loads was studied using load-displacement track technology. Some conclusions are obtained: out-plane buckling of upper branch is the main buckling mode for Y-shaped column under vertical loads; Y-shaped column is not sensitive to initial geometrical imperfection; horizontal wind is not the control load for the stability of Y-shaped columns; plastic strain is found before instability under vertical and horizontal load, and strength ductility failure is more important than instability for Y-shaped columns.Keywords: Y-shaped column; overall stability; non-linear analysis; initial geometrical imperfection作者簡介：崔家春，工程師，博士研究生，Email：jiachun_cui@xd-ad.com.cn。參考文獻［1］周健，丁生根，王洪軍，等.南京祿口國際機場T2航站樓結構設計［J］.建筑結構，2012，42（5）：110-114.［2］曾瑩,羅永峰,沈祖炎,等.浦東機場航站樓Y型柱對屋蓋整體穩(wěn)定影響分析［J］.空間結構，2010,16(1):65-70.［3］郭彥林,王永海,劉祿宇,等.廣州新電視塔底部透空區(qū)外筒群柱面外穩(wěn)定承載力試驗研究［J］.建筑結構學報，2010,31(1):78-86,93.［4］田偉,向新岸,趙陽,等. 考慮彎矩作用梭形鋼格構柱穩(wěn)定承載力非線性有限元分析［J］.建筑結構學報,2010,31(5):42-48.［5］崔家春.世博軸陽光谷整體穩(wěn)定性分析研究［J］.土木建筑工程信息技術,2011,3(1):73-78.［6］沈世釗,陳昕.網殼結構穩(wěn)定性［M］.北京:科學出版社,1999.［7］JGJ 7—2010 空間網格結構技術規(guī)程［S］.北京:中國建筑工業(yè)出版社,2010.
