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1)南京航空航天大學(xué)土木工程系，210016；2)南京長(zhǎng)安建筑設(shè)計(jì)有限公司，210002；3)東南大學(xué)土木工程學(xué)院，南京，210096。

［提要］節(jié)點(diǎn)位置偏差是影響大跨度空間結(jié)構(gòu)整體穩(wěn)定性的一個(gè)主要初始幾何缺陷，但目前關(guān)于實(shí)際結(jié)構(gòu)中節(jié)點(diǎn)位置缺陷的資料還很少。對(duì)六個(gè)試驗(yàn)?zāi)Ｐ秃湍贤w育會(huì)展中心體育館鋼屋蓋實(shí)際結(jié)構(gòu)的節(jié)點(diǎn)位置偏差實(shí)測(cè)數(shù)據(jù)進(jìn)行了較為系統(tǒng)的概率統(tǒng)計(jì)及假設(shè)檢驗(yàn)分析，研究了結(jié)構(gòu)初始幾何缺陷隨機(jī)分布規(guī)律及其統(tǒng)計(jì)參數(shù)。研究結(jié)果表明，異常數(shù)據(jù)的分布較為集中，與施工難度和測(cè)設(shè)條件相關(guān)；結(jié)構(gòu)節(jié)點(diǎn)位置偏差的分布可采用正態(tài)分布假定。隨機(jī)缺陷分析方法中假定結(jié)構(gòu)每個(gè)節(jié)點(diǎn)的位置偏差符合二倍均方差范圍內(nèi)的正態(tài)概率密度函數(shù)是可以接受的。

［關(guān)鍵詞］穩(wěn)定；初始幾何缺陷；實(shí)測(cè)數(shù)據(jù)；假設(shè)檢驗(yàn)；正態(tài)分布

Statistical Regulation and Parameter Study on Initial Geometrical Imperfections of Spatial Structures Based on Measured Data/Tang Gan¹, Li Delin², Zhao Caiqi³, Zhao Huilin³ (1 Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2 Nanjing Changan Architectural Design Ltd., Co., Nanjing 210002, China; 3 College of Civil Engineering, Southeast University, Nanjing 210096, China)

Abstract:The initial deviations of the joint positions are the main initial geometrical imperfections that affect the stability behaviors of the long span spatial structures. At present, there is few data about the initial deviations of the joint positions of the actual structures. The measured data about the initial deviations of the joint positions of several experimental models and an actual structure are studied carefully by the assumption and test methods. The results indicate that the initial deviations of the joint positions match normal probability density function limited in the range of double mean variance.

Keywords:stability; initial geometrical imperfections; measured data; assumption; normal distribution