【摘要】 为研究腹板开洞部分外包混凝土组合梁(以下简称PEC梁)在静力荷载作用下的受力性能，通过有限元分析软件ANSYS建立非线性受力行为的有限元模型，并通过现行规范对模型的正确性进行承载力和挠度理论值的计算。进而对比PEC梁和纯钢梁腹板开洞后在静力荷载作用下的抗弯和抗剪承载力，并对承载力影响参数进行分析。结果表明：对于PEC梁，只考虑主钢件中平行于剪力方向的板件对抗剪承载力的贡献存在偏保守的倾向；腹板开洞PEC梁的承载力显著高于腹板开洞纯钢梁；随着腹部混凝土强度的提高，其承载力提升不明显；随着腹板钢材强度的提高，其承载力提升显著；随着腹部混凝土纵筋配筋率的增大，其承载力有所提升；洞口尺寸越大，其承载力下降越快，混凝土提供的承载力越小。更多还原

【Abstract】 In order to study the mechanical performance of partially-encased concrete composite beams with web openings under static loading, a nonlinear mechanical behavior finite element model simulating the whole process of partially-encased concrete composite beams was established by the finite element software ANSYS,and the theoretical values of bearing capacity and deflection were calculated by the current code to verify the correctness of the model.Then the study compared the flexural and shear load capacities of partially-encased concrete composite beams and solid steel beams with web openings under static loading, and carried out parametric analysis of the parameters affecting the bearing capacity.The results show that, for the partially-encased concrete composite beams, it is over-conservative to consider the provision of shear capacity only for the slabs in the main steel members that are parallel to the direction of shear force.Partially-encased concrete composite beams with wed openings significantly improve the bearing capacity compare to solid steel beams with web openings.With the increase of concrete encasement strength, the improvement of bearing capacity is not obvious; with the increase of web steel strength, the improvement of bearing capacity is obvious; with the increase of longitudinal reinforcement ratio in concrete encasement, the bearing capacity increases accordingly, and the bigger the holes are, the faster the bearing capacity decreases, and the smaller the bearing capacity provided by the concrete is.更多还原