Experimental Investigation on Flexural Performance of Precast Sandwich Insulation Panels with GFRP Screw Connectors
In order to improve the flexural and thermal insulation performance of the precast sandwich insulation panel and strengthen the composite action of the inner and outer panels,this paper proposes a type of precast sandwich insulation panels using GFRP screw connectors to connect the inner and outer layer panels.Meanwhile,GFRP plate was set to replace part of longitudinal or transverse reinforcements,which facilitates the anchorage of GFRP screw connectors in the inner and outer layer concrete panels.The monotone loading tests of four specimens were carried out to analyze the failure mode,load-displacement curve,slip between thermal insulation material and concrete,crack width and composite action of the panels.The results show that the specimens that the partially longitudinal reinforcements were replaced by the GFRP plates or steel plates had good load bearing capacity,deformation capacity,ductility and composite action.All precast sandwich insulation panels occurred bending failure.GFRP screw connectors or ordinary steel connectors can effectively transfer force between the inner and outer concrete panels,limiting the slip between the concrete and thermal insulation material.The composite degree coefficient of precast sandwich insulation panel QB1 with GFRP screw connectors was 25%higher than that of QB3 with ordinary steel screw connectors.The new type of precast sandwich insulation panels using GFRP screw connectors to connect the inner and outer layer panels has good bearing capacity and deformation capacity,and its integrity is excellent,and the screw can effectively transfer force between the inner and outer concrete panels,the composite degree coefficient is higher than 50%.
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