中文摘要：

为研究椭圆钢管混凝土构件的受扭性能和抗扭承载力计算,文章通过ABAQUS建立了椭圆钢管混凝土受扭构件的理论分析模型,开展了椭圆钢管混凝土构件受扭性能的参数分析,研究参数包括钢材强度、混凝土强度、截面含钢率、截面面积和长短轴比,揭示了椭圆钢管混凝土构件在纯扭状态下的受力机理,提出了椭圆钢管混凝土纯扭构件的抗扭承载力简化计算公式。研究结果表明：椭圆钢管混凝土构件的抗扭强度承载力随着钢材强度、截面面积和含钢率的增大而增大;椭圆钢管混凝土构件的扭矩（T）-转角（θ）曲线可分为弹性阶段、弹塑性阶段和塑性强化阶段,表现出良好的塑性性能;提出的椭圆钢管混凝土构件抗扭强度承载力公式可用于椭圆钢管混凝土设计中。

英文摘要：

To study the torsional behavior and ultimate torsional strength calculation of elliptical concrete-filled steel tube（ECFST） members, the numerical analysis model of the ECFST members sub jected to torsional loading was established by ABAQUS software. The parameter analysis of ECFST members under pure torsion was carried out, including steel and concrete strength, steel ratio, sec tional area and long-to-short axis ratio. The force mechanism of ECFST members under pure torsion was revealed. A simplified calculating formula of ultimate torsional strength of ECFST members was proposed. The research results indicated that the ultimate torsional strength of ECFST members increased with the increase of steel strength, sectional area and steel ratio. The torsion（T）-angle（0） curve of ECFST members could be divided into elastic stage, elastic-plastic stage and plastic hardening stage, showing a good plastic property. The calculating formula of ultimate torsional strength can be used in the design of ECFST members.