不同浇筑方式下UHPC空心板受力性能研究

为了研究不同浇筑方式下的UHPC空心板结构的受力性能,通过两点对称加载法分别对1块UHPC整浇空心板和2块抗剪腹筋数量不同且分2次浇筑的UHPC叠合空心板进行弯曲加载试验,对试件的承载力、挠度、裂缝形态以及混凝土应变进行分析。研究结果表明:有腹筋叠合空心板和整浇空心板在对称荷载作用下纯弯段满足平截面假定;整体浇筑可以提高试件的承载力且显著增强试件的延性;增加抗剪腹筋的数量能够显著降低叠合板的滑移,提高叠合板的整体抗弯刚度和承载力,仅靠人工粗糙面难以满足叠合面的抗剪要求。最后,参考相关规范对各试件受弯承载力进行了计算对比,计算值与试验值吻合较好。

Mechanical behavior of UHPC hollow slab under different pouring modes

In order to investigate the mechanical behavior of UHPC hollow slabs with different pouring methods,the bending loading tests were carried out on a cast-in-place UHPC hollow slab and two UHPC composite hollow slabs with different numbers of vertical shear rebars by two-point symmetric loading method.The bearing capacity,deflection,cracking,and concrete strain of the specimens were tested.The results indicate that the pure bending section of composite hollow slab with web reinforcement and cast-in-place hollow slab satisfies the assumption of plane section under symmetric load;overall pouring can improve the bearing capacity of the test specimens and significantly enhance their ductility;increasing the number of vertical shear rebars can significantly reduce the slip of the composite slab and enhance the overall flexural rigidity and load-bearing capacity of the laminated slab,whereas it is difficult to meet the shearing requirements of the laminated surfaces via artificial rough surfaces treatment.Finally,the flexural capacity of each specimen was calculated and compared with reference to the relevant specifications.The calculation values agree well with the experimental values.