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采用ABAQUS软件对小跨高比钢板-混凝土组合连梁抗剪承载力进行了数值分析。通过大量的数值模拟,分析了跨高比、钢板厚度和纵筋配筋率等参数对小跨高比钢板-混凝土组合连梁抗剪承载力的影响。结果表明,小跨高比钢板-混凝土组合连梁对钢板的抗剪承载力利用率更高,但是增加钢板厚度会使钢板抗剪承载力利用率迅速降低;当小跨高比钢板-混凝土组合连梁发生剪切破坏时,纵筋配筋率几乎不对试件承载力有影响;根据钢板厚度和跨高比的不同,发生剪切破坏的钢板-混凝土组合连梁中钢板对抗剪承载力的贡献可达到43%~81%,但不会超过81%。分析拟合了钢板对抗剪承载力贡献的计算公式,提出的计算方法可以应用于小跨高比钢板-混凝土组合连梁的设计,建议设计过程中承受较大剪力的小跨高比钢板-混凝土组合连梁钢板抗剪承载力乘以折减系数0.8。
ABAQUS software was used to analyze the shear strength of steel-concrete composite beams with small span ratio. Through a large number of numerical simulations, the influence of span ratio, plate thickness and longitudinal reinforcement ratio on the shear strength of steel-concrete composite beams with small span ratio is analyzed. The results show that the utilization ratio of the shear strength of the steel plate with the small span ratio steel-concrete composite beam is higher, but the increase of the steel plate thickness leads to the rapid decrease of the steel plate shear capacity utilization rate. When shear failure occurs in the beam, the reinforcement ratio of the longitudinal reinforcement has little effect on the bearing capacity of the specimen. According to the different thickness and span of the steel, the shear strength of the steel-concrete composite beam Contribution can reach 43% ~ 81%, but not more than 81%. The formula to calculate the contribution of the plate to the shear capacity is analyzed and the calculation method proposed can be applied to the design of the steel-concrete composite beam with small span ratio. It is suggested that the small span ratio steel plate - Shear bearing capacity of concrete composite beam multiplied by a reduction factor of 0.8.