基于不同試驗方法的高強等邊角鋼穩(wěn)定性研究*
郭宏超1,郝際平2,簡政1,劉茂社1,張?zhí)旃?
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郭宏超1,郝際平2,簡政1,劉茂社1,張?zhí)旃?(1 西安理工大學土木建筑工程學院, 西安 710048; 2 西安建筑科技大學土木工程學院, 西安 710055; 3 河南省電力勘察設計院, 鄭州 450001)[摘要]在單根構件和子結構承載力試驗基礎上,分析對比了Q460等邊角鋼的破壞模式、穩(wěn)定承載力、端部約束影響等。研究表明:子結構承載力試驗能真實反映構件在結構中的受力性能和實際約束條件,子結構承載力試驗值略高于單根構件試驗值,可作為檢驗、校核構件承載力的依據;按《美國輸電鐵塔設計導則》(ASCE 10—97)計算的承載力理論值偏低,其構件穩(wěn)定系數有待修正。研究為Q460高強角鋼的規(guī)范制訂和工程應用提供了合理依據。[關鍵詞]高強角鋼; 極限承載力; 長細比; 局部屈曲; 破壞模式中圖分類號:TU392.6文獻標識碼:A文章編號:1002-848X(2013)13-0051-04Stability study of high strength equal angle steel based on different test methodsGuo Hongchao1, Hao Jiping2, Jian Zheng1, Liu Maoshe1, Zhang Tianguang3(1 Department of Civil Engineering and Architecture, Xi′an University of Technology, Xi′an 710048, China;2 Department of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China; 3 Henan Electric Power Survey & Design Institute, Zhengzhou 450001, China)Abstract: Based on the single component and substructure bearing capacity tests, the failure mode, stability bearing capacity and end constraint influence of Q460 high strength equal angle steel were compared. The results show that the test of substructure can truly reflect the mechanical behaviors and actual constraints of the structural components. The substructure test value, which a little larger than single component test, can be the basis for checking the bearing capacity of structural components. The calculated theoretical value according to the ASCE 10—97 is a little small, so the stability coefficient of the component needs to be amended. The research provides the reasonable basis for amending the specification and engineering practice of Q460 high strength angle steels.Keywords: high strength angle steel; ultimate bearing capacity; slenderness ratio; local buckling; failure mode*國家自然科學基金資助項目(51078310),西安市建設科技項目計劃(sjw201219),陜西省教育廳自然科學專項(2013JK0967)。作者簡介:郭宏超,博士,講師,Email:ghc-1209@163.com。參考文獻[1]郭日彩,何長華. 輸電線路鐵塔采用高強鋼的應用研究[J]. 電網技術,2006,30(23):21-25.[2]GB 50017—2003 鋼結構設計規(guī)范[S]. 北京: 中國計劃出版社, 2003.[3]陳紹蕃. 單邊連接單角鋼壓桿的計算與構造[J]. 建筑科學與工程學報,2008,25(2):72-78.[4]郭兵. 單角鋼壓桿的屈曲及穩(wěn)定計算[J]. 建筑結構學報,2004,25(6):108-111.[5]沈祖炎,胡學仁. 單角鋼壓桿的穩(wěn)定計算[J]. 同濟大學學報:自然科學版,1982, 10(2): 56-71.[6]ELGAALY M,PAGHER H,DAVIDS W.Behavior of single-angle-compression members[J].Journal of Structural Engineering, 1991, 117(12):3720-3741.[7]ASCE 10—97 Design of latticed steel transmission structures[S]. New York: American Society of Civil Engineers, 1997.