八字型加劲肋加固洞口对腹板开洞钢–混凝土组合梁的受力性能影响分析

Analysis of the Influence of the Opening of the Eight-Shaped Stiffener on the Mechanical Performance of Steel-Concrete Composite Beams with Web Holes

摘要: 通过研究不同八字型加劲肋加固洞口对腹板开洞钢–混凝土组合梁受力的影响，选择合适的八字型加劲肋参数以降低开洞造成的不利影响；利用ABAQUS对洞口设置在弯剪区段的组合梁进行力学性能分析，研究了八字型加劲肋上端距离洞口中线距离、八字型加劲肋下端距离洞口中线距离以及八字型加劲肋厚度对承载力、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；八字型加劲肋厚度变化对承载力影响最为明显，其次为上端距中线距离，下端距中线距离影响不大；八字型加劲肋厚度越大及下端距中线距离越小变形能力越大、上端距中线距离越小其变形能力越小。

Abstract: The effect of different eight-shaped stiffeners on the stress of steel-concrete composite beams with web holes was studied, and the appropriate eight-shaped stiffeners parameters were selected to reduce the adverse effects caused by opening holes. Using ABAQUS to analyze the mechanical properties of composite beams with different openings in the flexural shear section, the effects of the distance between the upper end of the eight-shaped stiffener and the center line of the opening, the distance between the lower end of the eight-shaped stiffener and the center line of the opening and the thickness of the eight-shaped stiffener on the bearing capacity and deformation ability were studied. The results show that the stiffness and ultimate bearing capacity of steel-concrete composite beams will decrease due to the opening of the web. The influence of the thickness of the eight-shaped stiffener on the bearing capacity is most obvious, followed by the distance between the upper end and the center line, and the distance between the lower end and the center line has little effect. The larger the thickness of the octave stiffener and the smaller the distance between the lower end and the center line, the larger the deformation capacity, and the smaller the distance between the upper end and the center line, the smaller the deformation capacity.