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采用斜压柱理论模型及有限元方法,研究了常温及火灾下圆角多边形孔蜂窝梁孔间腹板受剪屈曲性能和受剪屈曲承载力计算方法。孔间腹板S/d0和d0/tw的取值范围分别为1.4~2.0和41.4~80.7。在参数分析的基础上,对斜压柱的有效宽度及压力进行修正,用于计算孔间腹板的屈曲承载力;并提出了等效矩形理论,用于计算孔洞截面的受剪屈服承载力。蜂窝梁受剪承载力为孔间腹板屈曲承载力和孔洞截面受剪屈服承载力的较小值。采用修正的斜压柱理论模型和等效矩形理论得到的圆角多边形孔蜂窝梁受剪承载力稍小于有限元结果,比值在0.856~0.978之间。采用修正的斜压柱模型,并按照规范BS5950计算斜压柱屈曲应力,反算火灾下蜂窝梁孔间腹板屈曲温度,得到的火灾下圆角多边形孔蜂窝梁的孔间腹板屈曲温度仅稍低于有限元结果,偏差为0.17%~6.28%。
The method of calculating the buckling strength and the buckling flexural capacity of the webs between the holes of a polygonal honeycomb beam under normal temperature and fire is studied by using the baroclinic model and the finite element method. The values of S / d0 and d0 / tw for the webs between holes are respectively 1.4-2.0 and 41.4-80.7. Based on the analysis of the parameters, the effective width and pressure of the bar were modified to calculate the buckling capacity of webs. The equivalent rectangular theory was proposed to calculate the yield strength . Shear bearing capacity of honeycomb beams is the smaller value of the buckling bearing capacity of the webs between the holes and the shear yielding capacity of the cross-section of the holes. The shear bearing capacity of the perforated polygonal honeycomb beam with the modified bar and the equivalent rectangular theory is slightly less than the finite element results, with the ratio between 0.856 and 0.978. The corrected baroclinic column model was used and the buckling stress of bar was calculated according to BS5950. The buckling temperature of the web between the holes of honeycomb beam under fire was calculated. Slightly lower than the finite element results, the deviation of 0.17% ~ 6.28%.