不同洞口类型对腹板开洞钢–混凝土组合梁受力性能影响分析

Analysis of the Influence of Different Opening Type on the Stress Performance of Steel-Concrete Composite Beams with Web Openings

摘要: 通过研究不同洞口类型对腹板开洞钢–混凝土组合梁受力的影响，选择合适的洞口形状及洞口位置以降低开洞造成的不利影响；在已有试验基础上，利用ABAQUS对洞口设置在弯剪区段且洞口形状不同的组合梁进行力学性能分析，研究了洞口形状对承载力、变形能力的影响。结果表明：钢–混凝土组合梁腹板开洞会导致刚度、极限承载力下降；组合梁因洞口形状和位置不同，极限变形有不同程度增强；洞口的形状和位置对梁的极限承载力产生显著影响，在不同的洞口形状对比实验中，当腹板开设双圆形洞口时，相比于双正方形洞口，其承载力的下降幅度相对较小；当洞口之间的间距增大时，梁的承载力会有所提高。特别是当右侧洞口距离加载点的距离减小时，这种承载力的增加效应尤为明显；另外，洞口形状及位置对腹部开洞组合梁的变形能力影响较大。

Abstract: By studying the influence of different types of openings on the stress of steel-concrete composite beams with web openings, appropriate opening shapes and positions are selected to reduce the adverse effects caused by openings; on the basis of existing experiments, Abaqus was used to analyze the mechanical properties of composite beams with different shapes of openings set in the bending shear section, and the influence of opening shape on bearing capacity and deformation capacity was studied. The results show that opening holes in the web of steel-concrete composite beams can lead to a decrease in stiffness and ultimate bearing capacity; the ultimate deformation of composite beams is enhanced to varying degrees due to different shapes and positions of openings; the shape and position of the opening have a significant impact on the ultimate bearing capacity of the beam. In comparative experiments with different opening shapes, when the web plate has a double circular opening, the decrease in bearing capacity is relatively small compared to the double square opening; when the spacing between openings increases, the bearing capacity of the beam will be improved. Especially when the distance between the right side opening and the loading point decreases, the effect of increasing the bearing capacity is particularly significant; in addition, the shape and position of the opening have a significant impact on the deformation capacity of the abdominal opening composite beam.