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(1 江蘇大學(xué)理學(xué)院 鎮(zhèn)江 212013；2 東南大學(xué)土木工程學(xué)院 南京 210096)
［提要］ 外包鋼-混凝土組合梁是一種新型的組合梁，為了研究其受力性能和破壞模式，進(jìn)行了三根足尺簡支梁的試驗(yàn)研究。通過對(duì)構(gòu)件荷載撓度曲線、荷載應(yīng)變曲線及應(yīng)變沿截面高度變化的分析，認(rèn)為外包鋼混凝土組合梁具有較優(yōu)越的工作性能，其力學(xué)性能介于鋼梁和普通鋼筋混凝土梁之間。采用組合梁彈塑性理論，用積分的方法計(jì)算梁的屈服荷載和極限荷載，與試驗(yàn)結(jié)果比較吻合。提出了該種組合梁的一些構(gòu)造措施。
［關(guān)鍵詞］ 外包鋼 組合梁 試驗(yàn)研究 理論分析
Experimental Study and Theoretical Analysis of Steelencased Concrete Composite Beams/Shi Qiyin1,Ma Bo1,Li Aiqun2(1 Faculty of Science，Jiangsu University,Zhenjiang 212013，China; 2 Institute of Civil Engineering，Southeast University，Nanjing 210096，China)
Abstract:Steelencased concrete composite beam is a new type of composite beam.To explore its mechanical characters and damage modes，three full size simple supported samples have been performed.By analyzing loaddeflection relationship，loadstrain relationship and strain distribution along beam width，it is concluded that this kind of beams has good work ability and the mechanical character is between steel girder and common reinforced concrete girder.Composite elasticplastic theory and integration method are adopted to calculate the three samples yielding and ultimate moments.The theoretical results are in good agreement with the measurement ones.Some construction measures and unsettled problems are presented.
Keywords:steelencased; composite beam；experimental research；theoretical analysis

*江蘇省自然科學(xué)基金資助項(xiàng)目(BK2004064)；江蘇省建設(shè)系統(tǒng)科技項(xiàng)目(JS200321)