水泥基植物纤维预制装配式叠合板受弯性能研究OA

To study the flexural properties of cement-based plant fiber composite slabs,static tests were conducted on 10 full-scale composite slabs,and corresponding load-deflection curves,load-strain curves,failure modes,and corresponding failure loads were revealed.The effects of concrete layer thickness,protective layer thickness,and span on the mechanical behavior of composite slabs were investigated,including the influence of prefabricated base plates on crack resistance,failure modes,and sectional stress distribution.The results indicate that,owing to the material properties of cement-based plant fiber base plates,the failure modes of composite slabs under sagging moment are different from those of cast-in-place concrete slabs.The cracking of cement-based fiber composite slabs is more sudden without obvious precursors,manifested as the overall breakage of the glass fiber mesh in the prefabricated base plate.After the glass fiber reinforced plastics(GFRP)mesh is broken,the bearing capacity of the composite slab decreases slightly.Setting cement-based fiberboard on the tensile side can improve the ultimate bearing capacity and ductility.The cooperative stress performance of prefabricated bottom plate and post-cast concretes is good,the phenomenon of slipping does not occur on the laminated surface.When the composite slab under hogging moment reaches the ultimate bearing capacity,both the upper reinforcement and the bottom reinforcement are under tension,its ultimate bearing capacity is lower than that of cast-in-place concrete slabs,and the failure mode was similar to that of appropriate reinforcement slabs.In addition,the stress of fiberboard under tension is equivalent to a tensile force Fg,and the fiberboard under compression is equivalent to a concrete layer with thickness d.According to the test data,the values of Fg and d are calculated,and the formula is modified.