不同结构杨木单板层积材的蠕变和抗弯性能  

Creep Behavior and Bending Properties of Poplar LVL in Different Assembly Types

作　　者：徐咏兰[1] 华毓坤[1] 

机构地区：[1]南京林业大学人造板研究所,南京210037

出　　处：《木材工业》2002年第6期10-12,共3页China Wood Industry

摘　　要：　本文研究了单板层积材(LVL)的压缩率、结构形式和增强方式对其蠕变特性、弹性模量以及静曲强度的影响。研究表明:在本研究范围内,提高LVL的密度和合理组坯是改善其力学性能和蠕变特性的较好途径;采用浸胶单板可适当改善LVL的力学性能;LVL的蠕变特性曲线同木材的相似,但其瞬时挠度一般大于瞬时弹性恢复值;通过提高LVL的静曲强度和弹性模量有望改善其蠕变性能。The effects of compression ratio, assembly type and reinforcement method on mechanical properties of Poplar laminated veneer lumber (LVL) were investigated. Among all the factors, the compression ratio was the most effective. Higher compression ratio resulted in higher modulus of rupture (MOR), modulus of elasticity (MOE) and shear strength but less deflection related to creep. LVL assembled using thinner veneer on the face and thicker veneer in the core layers, as well as LVL made by resin impregnated veneer showed better mechanical properties. LVL with fiberglass reinforcement had less effective influence. The creep behavior of LVL was similar to that of wood. However, the instantaneous recovery of LVL specimens, measured after load removal, was less than the instantaneous deflection. Some assembly types mentioned in this paper could benefit LVL by increasing MOR and MOE as well as modifying creep behavior.

关 键 词：单板层积材 LVL 压缩率 静曲强度 弹性模量 杨木 蠕变性能 抗弯性能 

分 类 号：S781[农业科学—木材科学与技术]