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門式剛架含缺陷外伸式端板梁柱節(jié)點有限元分析與試驗研究
林建京
摘 要

 

林建京(福建省建筑科學研究院,福州 350025)

[摘要]對1個符合規(guī)范要求(無缺陷)和3個不符合規(guī)范要求(含缺陷)的門式剛架外伸式端板連接節(jié)點進行了承載力試驗及相應(yīng)的有限元分析,以了解實際工程中存在的含缺陷節(jié)點的力學性能,并對該類節(jié)點在正負彎矩作用下的性能進行了有限元分析。研究結(jié)果表明:在節(jié)點域屈曲起控制的節(jié)點中,節(jié)點域設(shè)置加勁肋對提高節(jié)點的承載力作用相當顯著;相對于梁端板和柱翼緣同時加厚的無缺陷節(jié)點,含缺陷節(jié)點的極限承載力基本接近,但其彈性抗彎能力下降、初始轉(zhuǎn)動剛度有所下降,其性能分析適合采用半剛性理論。所采用的有限元分析方法結(jié)果可靠,可為含缺陷節(jié)點的門式剛架結(jié)構(gòu)的整體受力分析或后續(xù)加固提供依據(jù)。

[關(guān)鍵詞]門式剛架;外伸式;端板連接;足尺試驗;有限元分析

中圖分類號:TU328文獻標識碼:A文章編號:1002-848X(2012)01-0070-05

Finite element analysis and experimental study on defect-containing extended End-plate beam-column joint of portal frames

Lin Jianjing(Fujian Academy of Building Research, Fuzhou 350025, China)

Abstract:The bearing capacity tests of 4 extended end-plate connections of portal frames, which include a coinciding with the design code (normal) one and other 3 non-coincidence (defect-containing) ones, were carried out along with finite element analysis to comprehend the mechanical property of such connections in practice. The behaviors under positive and negative moment of these connections were analyzed by finite element method. Several conclusions have been drawn: setting ribbed stiffener in joint panel zone is essential to increase the bearing capacity for joints of which bearing capacity are determined by buckling of joint panel zone; the ultimate bearing capacities of defect-containing joints are closely to the normal ones, yet their elastic bending resistance and initial rotational stiffness decrease, and the semi-rigid theory is appropriate for the performance analysis of such kind of joints. The adopted finite element analysis is reliable enough to give references to the structural force analysis and the subsequent structural reinforcement of defect-containing joints.

Keywords:portal frame; extended; end-plate connection; full-scale experiment; finite element analysis

*福建省科技計劃重點項目(2008Y0013)。

作者簡介:林建京,高級工程師,一級注冊結(jié)構(gòu)工程師,Email: ljj@fjjky.com。

參考文獻

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[3]張一舟, 王元清, 施剛, 等. 節(jié)點剛度對多層平面鋼框架抗震性能的影響分析[J]. 華中科技大學學報:城市科學版, 2006, 23(2): 41-45.

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[5]SHI G, SHI Y J, WANG Y Q, et al. Finite element analysis and tests on bolted end-plate connections in steel portal frames[J]. Advances in Structural Engineering, 2004, 7(3): 245-256.

[6]GB 50017—2003 鋼結(jié)構(gòu)設(shè)計規(guī)范[S]北京:中國計劃出版社,2003. 

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[8]莊茁, 由小川, 廖劍暉, 等. 基于ABAQUS的有限元分析和應(yīng)用[M]. 北京: 清華大學出版社, 2009.

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