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    石  艷，郭  兵，田海蘭
    (山東建筑大學(xué)土木工程學(xué)院，濟(jì)南250101)

[摘要] 將偏心支撐與半剛接鋼框架相結(jié)合，是一種新型的框架支撐體系。偏心支撐可以彌補(bǔ)半剛接鋼框架的剛度不足，同時(shí)又不降低其延性和耗能能力。運(yùn)用ANSYS有限元分析軟件，建立了4榀6層的半剛接鋼框架（1榀框架無偏心支撐，3榀框架有偏心支撐）有限元模型，對(duì)框架試件進(jìn)行模態(tài)分析。研究節(jié)點(diǎn)初始剛度、支撐條件等因素對(duì)框架自振周期的影響。根據(jù)分析得出：偏心支撐半剛接鋼框架的剛度主要由支撐提供，梁柱的半剛性連接對(duì)結(jié)構(gòu)的自振周期無顯著影響。在相同參數(shù)下，支撐類型對(duì)結(jié)構(gòu)自振周期有影響。
[關(guān)鍵詞] 偏心支撐鋼框架；半剛性連接；ANSYS；模態(tài)分析

    Modal analysis of eccentrically braced semi-rigid steel frames
    Shi Yan, Guo Bing, Tian Hailan
    ( Department of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China)

Abstract: There formed a new type of braced resistant steel frame, which combined eccentrically braces and steel frames with semi-rigid connections. Eccentrically braces increase the lateral stiffness of steel frames with semi-rigid connections and meanwhile maintain its ductility and energy dissipations. ANSYS was employed to model semi-rigid steel frames with four different support types. Modal analysis of the frames was studied to investigate the dynamic property of eccentrically braced semi-rigid steel frames, which was influenced by rotational stiffness of connections, eccentrically braced type and so on. It is concluded that the stiffness of eccentrically braced semi-rigid steel frames is supported mainly by the supports. The semi-rigid connection has no significant effect on the natural cycle. The types of eccentrically braced have effect in the same parameters.
Keywords: eccentrically braced steel frame; semi-rigid connection; ANSYS; modal analysis