Research on Mechanical Properties of Precast Geopolymer Concrete Sandwich Panels Under Axial Compression
Six precast geopolymer concrete sandwich panels enabled by glass fiber reinforced polymer(GFRP)hexagonal tubular connectors were fabricated and tested under axial compression.The effects of three key parameters,including the connector spacing,panel height and wythe thickness,on the failure mode,bearing capacity and deformation of the specimens under axial compression were studied and dis-cussed.The results showed that all specimens exhibited large eccentric compression failure due to the sec-ond-order effect,which was characterized by the concrete crushing and horizontal cracking in the two wythes,respectively;with the increase of the distance between the connectors,the composite performance of the wall panel was reduced,the area of the concrete crushing area decreased,the lateral deformation in-creased,and the bearing capacity of the specimens decreased gradually(when the distance between the connectors increased from 300 mm to 600,900 mm,and without connectors,the bearing capacity de-creased by 17.1%,42.0%,49.5%,respectively).With the decrease of the height of the wall panel or the increase of the thickness of the wythes,the slenderness ratio and the second-order effect of the speci-mens gradually decreased,the area of the concrete crushing zone increased,the out-of-plane deformation decreased,and the bearing capacity of the specimen increased(when the thickness of the wythes increased from 50 mm to 75 mm or the height decreased from 2 100 mm to 1 500 mm,the bearing capacity of the specimen increased by 34.3%and 5.9%,respectively).
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