OSB组合异型短柱轴压试验研究

苏正　曹宝珠　张聪　宋文涛　凌苛苛

摘要：为研究定向结构刨花板（Oriented Strand Board ， OSB）组合而成的异型短柱在轴压条件下的极限承载力及破坏特征，设计9个不同截面类型及螺钉间距的短柱试件以及5块同尺寸OSB板件，通过静力加载试验对其承载力大小、变形能力和破坏形态进行研究。根据试验结果，对不同类型、不同钉距短柱的破坏机理进行分析，提出基于组合系数和异型系数修正的短柱极限承载力公式，建立短柱极限承载力与短柱类型、钉距、高厚比、板材弹性模量、泊松比及板材长宽厚之间的关系。结果表明：随着钉距的减小，短柱承载力得到提高而延性随之降低，短柱破坏由中部挠曲破坏转变为端部剪切破坏;提出的短柱极限承载力公式的计算值与试验值符合较好，先求短柱组成板件的承载力再用组合系数及异型系数修正来得到短柱最终承载力的方案可行。

关键词：OSB;异型短柱;轴压试验;异型系数;极限承载力

中图分类号：TU366文献标识码：A文章编号：1006-8023（2019）03-0114-07

Axial Compression Test of OSB Combined Special-shaped Short Columns

SU Zheng， CAO Baozhu*， ZHANG Cong， SONG Wentao， LING Keke

（School of Civil Engineering and Architecture， Hainan University， Haikou 570228）

Abstract：In order to study the ultimate bearing capacity and failure characteristics of special-shaped short columns composed of Oriented Strand Board （OSB） under axial compression， nine short column specimens with different section types and screw spacing and five OSB specimens of the same size were designed. The bearing capacity， deformation capacity and failure mode were studied by static loading test. According to the test results， the failure mechanism of short columns with different types and different nail spacing was analyzed， and the formula of ultimate bearing capacity of short columns modified by combination coefficient and special-shaped coefficient was proposed. The relationship between the ultimate bearing capacity of short columns and the types of short columns， nail spacing， height-thickness ratio， elastic modulus， Poissons ratio of plates， length and width of plates was established. The results showed that with the decrease of nail spacing， the bearing capacity of short columns increased and ductility decreased， and the failure of short columns changed from flexural failure in the middle to collapse failure in the end. It was feasible to get the ultimate bearing capacity of short columns.

Keywords：OSB; special-shaped short columns; axial compression test; abnormal coefficient; ultimate bearing capacity

0引言

定向結构刨花板（OSB）作为工程人造板自1964年在加拿大问世，在过去的25年中得到了广泛地应用，产量持续稳定增长。中国OSB正式研究始于1978年，曾列入国家“八五”科技攻关项目，南京林业大学还成立了定向结构板工程研究中心，对OSB进行了比较系统的研究。1991年首条引进的OSB生产线在南京落成;1995年首条国产OSB生产线在福建建瓯建成，同年获专利。1998年开始起草OSB的行业标准（LY/T158022000），并于2001年开始正式颁布实施[1-5]。OSB板具有材……