常温及火灾下蜂窝梁腹板屈曲承载力计算方法

发布时间：2018-10-19 16:27

【摘要】：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%。
[Abstract]:The shear buckling behavior and shear buckling capacity of web between honeycomb beam-holes with circular polygonal holes under normal temperature and fire are studied by using the theoretical model of baroclinic columns and finite element method. The values of S/d0 and d0/tw in interhole web were 1.40.0.and 41.40.7respectively. On the basis of parameter analysis, the effective width and pressure of baroclinic columns are modified to calculate the buckling capacity of web between holes, and the equivalent rectangular theory is proposed to calculate the shear yield bearing capacity of the hole section. The shear bearing capacity of honeycomb beam is the smaller value of the buckling capacity of web between holes and the shear yield capacity of hole section. Using the modified baroclinic column model and the equivalent rectangular theory, the shear capacity of the circular polygonal hole honeycomb beam is slightly smaller than that of the finite element method, and the ratio is between 0.856V and 0.978. Using the modified baroclinic column model, the buckling stress of the baroclinic column is calculated according to the code BS5950, and the buckling temperature of the web between the holes of the honeycomb beam under fire is back calculated. The buckling temperature of the interhole web of the circular polygonal hole honeycomb beam under fire is only slightly lower than that of the finite element method, and the deviation is 0.17 and 6.28.
【作者单位】：山东大学土建与水利学院;保利(青岛)实业有限公司;
【基金】：国家自然科学基金项目(51578322) 山东省自然科学基金项目(ZR2015EM041)
【分类号】：TU391

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