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（內(nèi)蒙古科技大學(xué)土木工程學(xué)院， 包頭 014010）
［摘要］雙肢冷彎薄壁C型鋼框架是一種新型的鋼框架結(jié)構(gòu)。對兩榀3層單跨雙肢冷彎薄壁C型鋼框架進(jìn)行擬靜力試驗，以是否設(shè)置交叉支撐作為設(shè)計參數(shù)，研究支撐對該類鋼框架抗震性能的影響。通過對兩榀框架結(jié)構(gòu)的試驗破壞現(xiàn)象、滯回曲線和骨架曲線的分析，得到了兩榀框架結(jié)構(gòu)的破壞模式和各項抗震性能指標(biāo)，總結(jié)了交叉支撐對框架傳力機(jī)制及抗震性能的影響。結(jié)果表明，該類鋼框架結(jié)構(gòu)的破壞模式符合“強(qiáng)柱弱梁”的抗震設(shè)計要求，具有良好的延性和耗能能力，承載力退化穩(wěn)定；增設(shè)交叉支撐后，框架結(jié)構(gòu)的承載力和剛度明顯提高，框架側(cè)移明顯減小，但延性和耗能能力有所降低；通過對支撐及框架的受力分析結(jié)合試驗結(jié)論提出該類框架結(jié)構(gòu)支撐的設(shè)計建議。
［關(guān)鍵詞］鋼框架； 冷彎薄壁C型鋼； 支撐； 擬靜力試驗； 抗震性能
中圖分類號：TU391文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)23-0055-06
Experimental study on seismic behavior of cold-formed coupled C-typed steel bracing frames
Chen Ming, Ji Yechen
(School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China)
Abstract:The cold-formed thin-walled coupled C-typed steel frame is a new type of steel frame structure. Pseudo-static test was conducted on two three-layer and single-span frames composed of cold-formed thin-walled coupled C-typed steel, with existence of cross bracing as parameter, to investigate the influence of the bracing on the seismic performance of this steel frame. The failure modes and all indexes of seismic performance were obtained based on the analyses of the test failure phenomena, hysteretic curves and skeleton curves of two frame structures, and the effects of the cross bracing on force transmission mechanism and seismic performance were summarized. The results indicate that this kind of steel frame structure has good ductility and energy dissipation capacity, and the failure mode accords with the seismic design requirements of “strong column and weak beam”, and the bearing capacity degradation is stabilized. Compared with the frame structure without the cross bracing, the bearing capacity and rigidity of the frame structure with cross bracing are obviously improved and the lateral displacement is obviously decreased, but the ductility and energy dissipation capacity are decreased. The design recommendations of this kind of frame bracing structure were proposed based on mechanical analysis on the bracing and frame structure combined with the experimental conclusions.
Keywords:steel frame; cold-formed thin-walled C-typed steel; bracing; pseudo-static test; seismic behavior
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國家自然科學(xué)基金項目
(51368043,51768055)，內(nèi)蒙古自治區(qū)自然科學(xué)基金項目（2017MS（LH）0526），內(nèi)蒙古科技大學(xué)創(chuàng)新基金優(yōu)秀青年基金項目（2016YQL10）。
作者簡介：陳明，教授，博士，碩士生導(dǎo)師，Email：cmlx-1978@163.com。
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