含水率对PF-LVL指接部位静曲弹性模量的影响

以翼缘用意杨酚醛树脂单板层积材为研究对象，针对不同含水率对指接部位静曲弹性模量的影响进行研究，结果表明：随着含水率的增加，指接层积材静曲弹性模量下降幅度显著大于无指接材，且垂直指接下降幅度大于水平指接；含水率从12%吸湿至25%时，垂直和水平指接以及无指接的静曲弹性模量损失率分别为3673%、34.05%和3074%；层积材指接部位因湿胀引起的静曲弹性模量损失占损失总量的20%左右，湿胀对垂直指接静曲弹性模量损失的影响小于水平指接。

Effect of Moisture Content on the Modulus of Elasticity of the Finger Joints of PF LVL

The influence of moisture content (MC) on the static bending modulus of elasticity (MOE) of the finger joints of PF bonded LVL of poplar (PF LVL) was studied. The results showed that along with the increase of MC, the dropping ratio of the MOE for the finger jointed PF LVL was significantly higher than that of the non jointed PF LVL, and the dropping ratio of the MOE for the vertical joint was greater than that of for the horizontal joint the MOE losing rate of the vertical joint the horizontal joint and the non joint of the PF LVL was 3673%, 34.05% and 3074% respectively when the moisture content was increased from 12% to 25%. The results showed that the MOE loss of the PF LVL caused by moisture absorption accounted for about 20% of the total MOE loss, and the MOE loss of the vertical joint PF LVL caused by moisture absorption was less than that of the horizontal joint PF LVL.