为了研究负弯矩作用下腹板开洞钢-混凝土组合梁的极限承载力及相关受力性能,对4根组合梁试件进行了试验研究和有限元分析。结果表明,负弯矩作用下的组合梁腹板开洞后,其刚度和承载力明显降低,洞口区域应变不再符合平截面假定;通过增加混凝土板厚度可以提高其承载力;混凝土翼板对负弯矩区腹板开洞组合梁的抗剪承载力有很大的贡献;洞口形状对其受力性能有较大的影响。 In order to study the ultimate bearing capacity and related mechanical properties of steel-concrete composite beams with web openings under negative moment, the experimental research and finite element analysis of four composite beams were carried out. The results show that the rigidity and the bearing capacity of the composite web under the action of negative bending moment obviously decrease, and the strain in the hole area no longer accords with the assumption of the flat section. The increase of the thickness of the concrete slab can increase the bearing capacity. The shear capacity of composite beams with web openings in negative bending region greatly contributes to the mechanical properties of the composite beams.