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分析对比了圆角多边形孔蜂窝梁孔间腹板屈曲承载力的不同计算理论,包括楔体理论模型、英国钢结构协会计算手册理论模型、LAWSON理论模型及斜压柱模型等。采用不同理论对蜂窝梁孔间腹板的屈曲承载力进行了计算,并与试验结果进行了对比。结果表明,应用于六边形孔的楔体理论计算值过于保守,与试验值偏差均超过50%;应用于圆形孔的英国钢结构协会计算手册理论模型及LAWSON理论模型计算值也过于保守,偏差范围在58%~70%之间;斜压柱理论相比其它方法,计算结果较为准确,偏差范围在7.6%~39%之间。并采用验证的有限元方法分析了不同孔距、孔高及腹板厚度的蜂窝梁孔间腹板的屈曲承载力。应用斜压柱理论模型计算孔间腹板剪力承载力,与有限元参数分析结果对比表明,斜压柱模型按规范BS 5950-1:2000计算的理论值过于保守,理论值与有限元结果比值范围在0.185~0.384之间;按规范EN 1993-1-1计算的理论值评价孔距较小(S/d_0=1.4)蜂窝梁的剪力承载力时偏于安全,理论值与有限元结果比值范围在0.878~0.972之间,当孔距较大(S/d_0>1.4)时,理论结果偏于不安全,理论值与有限元结果比值范围在1.054~1.818之间,需要进一步修正。
The different calculation theories of buckling bearing capacity of honeycomb beams with rounded corners, such as the wedge body theory model, the calculation formula theory of British Steel Structure Association, LAWSON theoretical model and baroclinic column model, are compared and analyzed. Different theories were used to calculate the buckling capacity of webs between honeycomb beams and compared with the experimental results. The results show that the calculated values of the wedges applied to the hexagonal holes are too conservative and deviate from the experimental values by more than 50%. The calculations calculated by the British Steel Structure Association Theory Manual and the LAWSON theoretical model applied to the circular holes are too conservative , And the deviation range is between 58% and 70%. Compared with other methods, the barometric column theory is more accurate and the deviation range is between 7.6% and 39%. The flexural bearing capacity of webs between honeycomb beams with different hole heights, hole heights and web thicknesses was analyzed by the finite element method. Comparing the results of the finite element analysis with the bar code theory, the theoretical value of the baroclinic column model calculated according to the standard BS 5950-1: 2000 is too conservative. The theoretical value and the finite element result The range of values is between 0.185 and 0.384. According to the theoretical value calculated according to the standard EN 1993-1-1, the shear capacity of honeycomb girders with small hole spacing (S / d_0 = 1.4) is evaluated in terms of safety, theoretical value and finite element The results ranged from 0.878 to 0.972. When the hole distance was large (S / d_0> 1.4), the theoretical results were unsafe. The ratio of the theoretical value to the finite element result ranged from 1.054 to 1.818, which needs further correction.