陈国+张齐生+黄东升+李海涛

摘要：提出了一种以OSB为腹板骨架，OSB板外用环氧树脂胶黏剂和钉子连接竹集成材而成的胶合竹木工字梁.以竹木工字梁的腹板高度、剪跨比及加劲肋为参数，对24根竹木工字梁的结构性能进行研究.分析了工字梁试验全程的破坏形态和破坏机理，探讨了其极限承载力、延性和抗弯刚度等，并研究影响其结构性能的因素.研究结果表明，竹木工字梁整体工作性能优良，跨中截面应变沿梁高方向仍基本符合平截面假定，其极限承载力与截面高度、剪跨比和加劲肋有关.当剪跨比小于2.0时，组合梁出现了明显的剪压破坏特征，剪跨比越大，极限承载力呈显著下降趋势.加劲肋能显著提高工字梁的极限承载力，提高幅度为3.4%～38.0%，对极限位移的提高幅度约为1.7%～12.6%.加劲肋增强后的工字梁的初始抗弯刚度亦有大幅提高，提高幅度为10%～30%，腹板越高，增幅越大.

关键词：欧松板;竹集成材;工字梁;破坏机理;抗弯性能

中图分类号：TU366.1 文献标识码：A

Bending Tests of OSB Webbed Bamboo IJoist

CHEN Guo， ZHANG Qisheng， HUANG Dongsheng， LI Haitao

（College of Civil Engineering， Nanjing Forestry Univ， Nanjing， Jiangsu210037， China）

Abstract：A OSB webbed bamboo Ishaped joist connected and fixed by epoxy resin adhesive and nails was presented. The web height， shear span ratio and web stiffener were included as control parameters to see their effect on the flexural performance of 24 OSB webbed bamboo joists. The failure process， failure mechanism， deformation and carrying capacity were investigated and the shear capacities were also discussed. The results show that the composite joists show excellent combination performance， higher stiffness and strength. Also， the shear capacity of this joist has a close relationship with the shear span ratio and web height. When the shear span ration is less than or equal to 2.0， the failure modes were characterized by shear compression failure of the OSB web panels. The web stiffeners can markedly improve the ultimate load of the joists by 3.4%～38.0%， and is helpful to ultimate displacement and initial flexural stiffness by 1.7%～12.6% and 10%～30%， respectively. The web is higher and the growth is greater.

Key words：OSB（Oriented Strand Board）;gluelaminated bamboo;Ijoist;failure mechanism;bending behavior

2013年以来，中国北方多地出现不同程度的雾霾天气，空气污染十分严重.建筑既是人类活动的基本场所，也是大量消耗能源、资源的重要环节，对雾霾天的贡献十分显著.传统类型的钢筋混凝土结构和砌体结构存在着资源利用率低和环境污染严重等问题，而竹木结构建筑由于轻质高强以及环境负荷小等优点[1-3]，具有广阔的应用前景.将竹材、速生木材等生物质材料作为主要建筑材料应用于工……