| Traditional slabs with high weight have an adverse influence on the seismic performance of structures,and can't adapt to the development of building industrialization due to the complicated construction process.The lightweight of building materials is an important research direction to meet the requirement of the assembly structure.A new lightweight fabricated floor with GFRP-PU hybrid sandwich plates is proposed,and the flexural behavior of this floor system is studied in this paper.The results can provide theoretical reference for the application of GFRP-PU hybrid sandwich plates in the assembly structure.Bending tests were conducted on six GFRP-PU hybrid sandwich plates to investigate the influence of GFRP configuration,plate thickness,and density of PU foam on the flexural performance of specimens.Test results show that the displacement variation of specimens was mainly linear elastic,and the shapes of specimens regained after unloading.GFRP can significantly increase the flexural strength and stiffness of the composite slabs.The flexural strength of specimens increased as the reinforcement ratio of GFRP increases,and the maximum improvement of flexural strength reached 454%.The foam core with high density increased the slab stiffness by 8%.Two sandwich plate-steel composite beams were tested under positive moment to investigate the ultimate flexural strength of the composite beams and the interfacial bond-slip behavior between different components.Test results show that,there are no obvious composite actions between the plate and the steel beam.The stiffness and strength of the composite beams can be considered same as those of the steel beam.Based on the experimental research,the theoretical analysis was conducted on the flexural performance of GFRP-PU hybrid sandwich plates.Calculation models for the flexural strength,stiffness,and deflection were put forward.The models can provide references for the engineering design of this composite plate. |
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