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[提要]  通過4根組合梁的純扭試驗(yàn)，并參考另外已有的4根組合梁的試驗(yàn)結(jié)果，討論了受扭組合梁的破壞形態(tài)。根據(jù)軟化桁架模型理論，通過平衡、變形和協(xié)調(diào)條件，建立了組合梁抗扭特性分析的方程式，并給出了一種計(jì)算組合梁抗扭特性（抗扭強(qiáng)度、扭轉(zhuǎn)角、開裂角、鋼筋和混凝土應(yīng)力、應(yīng)變等）的簡化算法，結(jié)果表明：理論值和試驗(yàn)值符合較好，可供組合梁的抗扭設(shè)計(jì)使用。
[關(guān)鍵詞]  鋼-混凝土組合梁 軟化模型 抗扭特性 試驗(yàn) 分析

Experimental investigation of 4 steel-concrete composite beams was conducted to study the torisonal behaviors of steel-concrete composite beams. Based on the softened truss model theory, the equations were derived from equilibrium, compatibility and material's constitutive relations, and an efficient algorithm was proposed togive the ultimate torsional strength, the angle of twist, the stress and strain of reinforced steel and concrete and so on. The calculated conclusions were coincided well with experimental values.
Keywords: steel-concrete composite beam; the softened t,russ model; experimental research; theoretical analysis; torisonal behaviors