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以开孔率为变量,分别对4根腹板开矩形孔口的蜂窝梁和蜂窝组合梁进行了抗剪试验。对比分析了两者的抗剪破坏特征,承载力及剪力-位移曲线。给出考虑楼板组合作用后蜂窝梁抗剪承载力的提高结果。结合修正后的有限元计算模型,对比研究不同开孔率、翼缘尺寸对矩形孔口蜂窝梁和蜂窝组合梁抗剪承载力的影响。对不同混凝土楼板尺寸影响下的矩形孔口蜂窝组合梁进行抗剪性能分析。结果表明:开孔率对矩形孔口蜂窝组合梁和蜂窝梁抗剪承载力影响较大;翼缘厚度对开孔率较小的矩形孔口蜂窝梁抗剪承载力有一定提高,对蜂窝组合梁影响较小。蜂窝组合梁中混凝土楼板提供主要抗剪贡献,能大幅提高矩形孔口蜂窝梁抗剪承载力,且有效防止矩形孔口处剪切变形。最后,给出了矩形孔口蜂窝组合梁抗剪承载力简化计算方法。
Taking the hole opening rate as a variable, the shear tests of four honeycomb beams and honeycomb composite beams with rectangular openings on the webs were carried out respectively. The shear failure characteristics, bearing capacity and shear-displacement curves of the two are compared and analyzed. The results of improving the shear capacity of honeycomb beams considering the combination of floor are given. Combined with the modified finite element calculation model, the influence of different open area ratio and flange size on the shear strength of rectangular aperture honeycomb beam and honeycomb composite beam was studied. Shear performance analysis of rectangular aperture honeycomb composite beam under the influence of different concrete floor size. The results show that the perforated rate has a great influence on the shear strength of rectangular cellular honeycomb composite beam and honeycomb beam. The thickness of the flange increases the shear strength of rectangular cellular honeycomb beams with small aperture ratio, Beam less affected. The concrete slab in the honeycomb composite beam provides the main contribution to shear, which can greatly improve the shear capacity of the rectangular honeycomb beam and effectively prevent the shear deformation at the rectangular orifice. Finally, a simplified method to calculate the shear strength of rectangular perforated honeycomb composite beams is given.