The paper aims to investigate the mechanical behavior of composite beams with the web opening under the static load. Nine composite beams with the web opening and one contrasting composite beam were analyzed by using the finite element program ANSYS. Specimens were all full-interraction, and the major parameters included the thickness,reinforcement ratio of concrete slab and hole's size. The calculation results show that the bearing capacity and stiffness of the composite beams were decreased notably by the web o-pening. Concrete slab above the hole is beared 77. 46% of the cross-sectional total shear force,while that of steel beam is no more than 22.54%. The ultimate load carrying capacity and deformability of composite beams with the web opening can be effectively enhanced by increasing the thickness and reinforcement ratio of concrete slabs. The interface slip increases rapidly with the increase of the hole's width. As the hole's height increases,the shear force proportion which occupied by the steel beam decreases relatively and that of the concrete slab increases relatively in the cross-sectional total shear,which provides a significant contribution to the shear bearing capacity.%目的 研究腹板开洞组合梁在静载作用下的受力性能,找出影响腹板开洞组合梁受力性能的主要因素.方法 采用有限元软件ANSYS对9根腹板开洞组合梁和1根对比组合梁试件进行了非线性模拟计算.试件均为完全剪力连接,主要变化参数为混凝土翼板的板厚、配筋率与洞口尺寸.结果 计算显示腹板开洞显著地降低了组合梁的承载力和刚度,洞口上方混凝土翼板承担了截面总剪力的77.46％,而钢梁仅承担了截面总剪力的22.54％.结论 增加混凝土翼板厚度能有效地提高开洞组合梁承载力,增加混凝土翼板的配筋率能有效地提高组合梁的变形能力.随着洞口宽度的增大洞口上方的界面滑移急剧增大；随着洞口高度的增大,钢梁承担的剪力在截面总剪力中所占比例相对减小,而混凝土翼板承担的剪力所占比例相对增大,混凝土翼板对腹板开洞组合梁的竖向抗剪承载力有较大的贡献.
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