（南京林业大学土木工程学院， 南京 210037）

［摘要］为研究3种加载方向下的结构用定向刨花板（OSB）的应力-应变本构模型，设计并试验研究了60个试件。结果表明：OSB的破坏形态与加载方向角α有关，受压破坏过程中出现了3种典型的破坏形态，即刨花层间裂缝、斜向剪切破坏以及褶皱破坏。随着加载方向角α的增大，OSB的弹性模量和抗压强度呈下降趋势。加载方向平行于板材纵向（α=0°）时的OSB弹性模量强度最大，α=45°时次之，α=90°时最小。提出了OSB的三折线模型和连续光滑曲线本构模型，模型结果和试验结果吻合较好。

［关键词］定向刨花板； 加载方向； 力学性能； 应力-应变模型

中图分类号：TU366-4文献标识码：A文章编号：1002-848X(2018)10-0064-04

Experimental study on constitutive relation of oriented strand board under uniaxial compression

Chen Guo, He Bin

(College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China)

Abstract:In order to study the uniaxial compressive stress-strain constitutive mode of structural-grade oriented strand board(OSB), 60 specimens with three different loading directions were designed and tested. The results show that the failure mode of OSB are related to loading directions relative to the longitudinal of OSB plates. There are three typical failure modes:  cracks  between wood flakes, diagonal shear failure and surface folding. With the loading angles increasing, the modulus of elasticity and compressive strength show a tendency to decrease. The pattern which loading direction is parallel to the vertical plate (α=0°) produce the highest strength and modulus of elasticity, followed by the α=45° pattern, and the α=90° pattern is the lowest. The three fold line model of OSB and the continuous smooth curve constitutive model were proposed, and the results obtained by the theoretic models are in good agreement with experiment results.

Keywords:oriented strand board; loading direction; mechanical performance; stress-strain model

*国家自然科学基金（51408312），江苏省自然科学基金(BK20130982)，中国博士后基金（2013M541679, 2014T70528），江苏省博士后基金（1301017A）。

作者简介：陈国，博士，副教授，Email: chenguo@njfu.edu.cn。