钢-混凝土组合梁位移延性分析

Research on ductility of steel-concrete composite beam

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。

Ductibility of composite beams with different ends constraint components in their negative moment region was studied.The concrete slab thickness, steel ratio and boundary beam rigidity were considered, it was done by means of the finite element software ANSYS. And then, the ductibility was compared for composite beam and composite truss girder. It shows that the ductile behavior is concerned with slab thickness,steel ratio and boundary beam rigidity, and reinforcement ratio influence is predominant. It also indicates that flexural strength of steel-concrete composite truss girder is less than that of steel-concrete composite beams with solid web, but it has a good seismic ductile energy dissipation performance.