Experimental Study and Theoretical Calculation of CLBT Bending Performance
In this paper,a CLBT was prepared using domestic fir sawn wood and flattened moso bamboo as base materials under the process parameters of glue amount 200 g/m2 and pressure 0.6 MPa.The bending properties of CLBT in the major strength and minor strength directions was studied through the three-point bending test,and the standard value and design value of CLBT bending strength were calculated based on the shear analogy theory.The results showed that the bending strengths of the major strength and minor strength directions are 58.19 MPa and 25.25 MPa respectively,and the bending elastic modulus of the major strength and minor strength directions are 8.54 GPa and 2.56 GPa respectively.Overall,CLBT has good bending properties.In the bending test,CLBT showed different failure modes in two directions.The major strength direction was mainly manifested by rolling shear of fir layer and the interlayer shear failure between fir layer and flatted bamboo layer,while the minor strength direction was mainly manifested by axial tension fracture of the lowest flat bamboo layer and the vertical layer.The standard value and design value of the major strength direction bending strength are 44.17 MPa and 21.03 MPa respectively,and the standard value and design value of the minor strength direction bending strength are 6.85 MPa and 3.26 MPa respectively,reaching the E1 level in ANSI/APA PRG 320-2019 bend performance requirements.
CLBTBending propertiesThe major strength directionThe minor strength directionTheoretical calculation
万方数据
维普
