竹木箱形组合梁力学性能试验研究*
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(1 南京林业大学土木工程学院， 南京 210037； 2 南京林业大学材料科学与工程学院， 南京 210037)
［摘要］提出一种以竹集成材为翼缘，OSB板为腹板的竹木箱形组合梁。以组合梁的剪跨比和加劲肋为参数，对12根梁试件的力学性能进行四点弯曲试验研究。结果表明，当剪跨比小于2.0时，组合梁出现了明显的剪切破坏特征，随剪跨比增大，极限承载力呈显著下降趋势。加劲肋能显著提高组合梁的极限承载力，提高幅度为14.7%～18.3%，对极限位移的提高幅度为1.4%～7.5%。加劲肋增强后的组合梁的初始抗弯刚度亦有大幅提高，提高幅度为9.4%～16.9%。研究表明，以OSB板为腹板的竹木箱形组合梁在工程结构领域具有很好的应用前景。［关键词］OSB板; 竹集成材; 箱形组合梁; 破坏机理; 抗弯性能中图分类号：TU366.3 文献标识码：A 文章编号：1002-848X(2015)22-0102-05
Experimental study on mechanical properties of composite OSB-bamboo beam with box sectionChen Guo1, Zhang Qisheng2, Huang Dongsheng1, Li Haitao1, Zhou Tao1（1 College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; 2 College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China)Abstract: A composite OSBbamboo beam with box section was proposed with glue-laminated bamboo as flange and OSB as web. Four-point bending test study was conducted on mechanical properties of 12 beams using parameters of the shear-span ratios and stiffening ribs of composite beams. The results show that when the shear-span ratio is less than 2.0, the composite beam has obvious shear failure characteristics, and the ultimate capacity decreases obviously with the increase of shear-span ratio. The ultimate capacity of the composite beam can be improved significantly by the stiffening ribs with the amplitude of 14.7%～18.3% and the increasing amplitude for ultimate displacement is 1.4%～7.5%. The initial bending stiffness of the composite beam strengthened with the stiffening ribs is also improved greatly with the amplitude of 9.4%～16.9%. The research shows that the composite OSB-bamboo beam with box section, which adopts OSB as web, has good application prospect in the field of engineering structure.Keywords: Oriented Strand Board (OSB); glue-laminated bamboo; composite beam with box section; failure mechanism; bending behavior
*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），江苏省高校自然科学基金（13KJB560008）作者简介：陈国，博士，讲师，Email:chenguo2009@126.com。
