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［提要］ 進行了4個1/2比例常規(guī)全焊鋼框架梁柱連接的循環(huán)加載試驗，研究了梁翼緣寬厚比、節(jié)點域柱腹板高厚比對連接破壞形態(tài)、延性和極限承載能力的影響，分析了這些因素對連接的滯回性能及對節(jié)點域柱腹板剪切變形的影響規(guī)律。對其中的兩個試件破壞的焊縫修復(fù)后加腋重新進行試驗，以研究加腋修復(fù)的效果。試驗結(jié)果表明，加腋改進形式可以大幅度提高連接的延性和極限承載力，其破壞形式均為梁端形成塑性鉸后經(jīng)歷反復(fù)塑性變形而發(fā)生整體失穩(wěn)，保證了強震條件下“強節(jié)點弱構(gòu)件”的設(shè)計原則。給出了設(shè)計施工建議。
［關(guān)鍵詞］ 梁柱連接 抗震性能 加腋 破壞機理 延性
Experimental Research on Hysteretic Behaviors of Welded Moment Resisting Frame Connections with General and Haunch Stiffened Form in Power Plant/Su Mingzhou1,Gu Qiang2,Xie Baoan3,Li Qicai2,Cheng Aiguo4(1 Xi'an University of Architecture & Technology, Xi'an 710055,China;2 University of Science and Technology of Suzhou, Suzhou 215011,China; 3 Northwest Institute of Power Plant Design, Xi'an 710048, China;4 Beijing Jiaotong University, Beijing 100044, China)
Abstract:In order to obtain the influences of widthtothickness ratio of beam flange and heighttothickness of column web in panel zone on failure mode, ductility and bearing capacity of beamcolumn connections, four halfscale specimens were tested under cyclic loading. Two of these specimens were repaired and stiffened with haunch to evaluate the effect of this repair method. The results reveal that it might greatly improve the ductility and bearing capacity of connections. All the repaired specimens failed with the formation of plastic hinge at the end of beam near the haunch, and lost their global stability due to cyclic plasticity deformation, which ensured the design criterion of strongconnectionweakmember. Suggestions on design and construction are presented.
Keywords:beamcolumn connection; seismic behavior; haunch; failure mechanism; ductility
1) 西安建筑科技大學(xué)，西安 710055；2) 蘇州科技學(xué)院，215011；3) 西北電力設(shè)計院，西安 710048；4) 北京交通大學(xué)，100044。
*國家自然科學(xué)基金資助項目（59978041）；國家電力總公司資助項目。