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(1 長(zhǎng)安大學(xué)建筑工程學(xué)院，西安 710061； 2 華陸工程科技有限責(zé)任公司，西安 710054；3 廣東博意建筑設(shè)計(jì)院，佛山 528300； 4 中國(guó)水電顧問(wèn)集團(tuán)西北勘測(cè)設(shè)計(jì)研究院，西安 710065)
［摘要］研究經(jīng)歷過(guò)兩次復(fù)雜應(yīng)力作用后的鋼管混凝土短柱再次受力的破壞形態(tài)和受力機(jī)理。從已破壞的鋼管混凝土節(jié)點(diǎn)中取出已明顯變形的芯鋼管混凝土短柱，施加軸向力至極限值，得到了可同時(shí)反映鋼管和鋼管混凝土第三次受力性能的荷載-位移曲線，分析了多次受力的鋼管混凝土短柱承載力的影響因素。試驗(yàn)發(fā)現(xiàn)第三次受力的鋼管混凝土短柱的受力性能與初次受力性能不同，其承載力明顯高于初次受荷的極限承載力，且鋼管的屈服點(diǎn)也大大提高，根據(jù)試驗(yàn)及分析結(jié)果建立了多次受力的鋼管混凝土短柱承載力計(jì)算公式。
［關(guān)鍵詞］鋼管混凝土；受力機(jī)理；復(fù)雜應(yīng)力；多次受力；試驗(yàn)研究
Experimental study on mechanical behavior of concrete-filled steel tube after bearing complex stress
Wang Yihong1, Li Xianshun2, Huang Kun3, Guo Zenghui4, Fu Min3(1 School of Civil Engineering, Chang′an University, Xi′an 710061, China; 2 Hualu Engineering&Technology Co., Ltd., Xi′an 710054, China;3 Elite Architectural Co., Ltd., Foshan 528300, China; 4 Northwest Hydro Consulting Engineers Checc, Xi′an 710065, China)
Abstract:The failure form and force-bearing mechanism were studied on the concrete-filled steel tube（CFST）stub columns after bearing complex stress twice. The obviously deformed concrete-filled core steel tubes were taken out from the CFST joints. The ultimate bearing capacity of the stub columns was studied by concentrically-loaded experiment and the load-displacement curves were gained. The mechanical behavior under the third force-bearing of the steel tube and CFST can be reflected simultaneously by the curves. The influence factors of the CFST stub columns′ force-bearing were analyzed. The experiment shows that the mechanical behavior of CFST stub column under the third force-bearing is different from that load firstly, the ultimate bearing capacity of the CFST stub column is higher than that under the first force-bearing, the yield point of steel tube is also heightened greatly, and the bearing capacity formula of the CFST stub column was put forward by the experiment and analyzed result.
Keywords:CFST; force-bearing mechanism; complex stress; repetitious force-bearing; experimental study
陜西省自然科學(xué)基金資助項(xiàng)目。
作者簡(jiǎn)介：王毅紅（1955-），女，山東煙臺(tái)人，教授，從事鋼-混組合結(jié)構(gòu)研究及應(yīng)用。Email:wangyh@chd.edu.cn。
參考文獻(xiàn)
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