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为研究现浇圆筒芯空心楼盖的受弯和受剪性能,进行了2组共6个试件的试验。通过荷载-挠度曲线的比较,研究了截面空心率和横肋对空心板弯曲性能的影响。根据实测板端受剪承载力的对比和实测箍筋应变的分析,研究了横肋对横孔板受剪承载力的影响,以及顺筒肋箍筋对顺孔板和横孔板受剪承载力的不同作用机理。研究表明,横肋有助于改善横孔板的弯曲性能,当截面空心率低于45%时横孔板与相应顺孔板的受弯性能基本相同。横肋弥补了通孔横孔板在剪力传递机理上的缺陷,能显著提高横孔板的受剪承载力。顺筒肋中的箍筋对横孔板的受剪承载力贡献极小,可忽略不计。同时依据试验结果,提出了考虑箍筋和横肋影响的受剪承载力计算方法。
In order to study the flexural and shear properties of cast-in-situ hollow core hollow slabs, two groups of six specimens were tested. Through the comparison of load-deflection curve, the influence of cross-sectional hollowness and cross-rib on the bending performance of hollow slab was studied. According to the comparison between the measured shear capacity and the measured strain of the stirrup, the influence of transverse ribs on the shear capacity of the transverse perforated plate is studied, and the shear stress Different mechanisms of action. The research shows that the transverse rib helps to improve the bending performance of the transverse perforated plate. When the hollowness of the cross-section is less than 45%, the bending properties of the transverse perforated plate and the corresponding transverse perforated plate are basically the same. Transverse ribs make up for the defect of the transversal perforated plate in the mechanism of the shear transfer, which can significantly improve the shear capacity of the transversal plate. Converse ribs in the stirrups on the horizontal hole plate shear capacity contribution is minimal, negligible. At the same time, based on the test results, the calculation method of shear capacity considering the influence of stirrups and transverse ribs is proposed.