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为了研究边缘约束构件对钢-混凝土组合梁延性性能的影响因素,以框架结构中一榀钢柱和组合梁作为计算对象,用有限元软件ANSYS进行了模拟分析。对混凝土翼缘板厚、横向配筋率和边梁抗侧、抗扭刚度等因素对组合梁延性的影响规律进行了比较分析。最后,进行了钢-混凝土组合梁与钢-混凝土组合桁架梁的位移延性的比较。数值分析结果表明:混凝土板厚度,配筋率大小和边梁抗侧、抗扭刚度对其延性性能都有影响,其中配筋率大小的影响最大,随着配筋率的增大,延性系数呈增大的趋势;钢-混凝土组合桁架梁在端部有负弯矩作用时,其抗弯承载力小于同条件下的实腹式钢-混凝土组合梁,但抗震耗能优势明显。
In order to study the influencing factors of the ductility of the steel-concrete composite beams by the edge constraint members, the finite element software ANSYS was used to analyze the effect of the steel columns and composite beams in the frame structure. The influence laws of concrete flange thickness, transverse reinforcement ratio, side-beam anti-side and torsional stiffness on the ductility of composite beams are comparatively analyzed. Finally, the displacement ductility of steel-concrete composite beams and steel-concrete composite truss beams is compared. The results of numerical analysis show that the thickness of concrete slab, the ratio of reinforcement and the lateral and torsional stiffness of the side beams all have influence on the ductility, of which the influence of the reinforcement ratio is the greatest. With the increase of the reinforcement ratio, the ductility coefficient The flexural capacity of the steel-concrete composite truss girder with negative bending moments at the ends is smaller than that of the solid-steel composite girder under the same conditions, but the seismic energy dissipation is obvious.