无机胶叠合木梁性能的试验研究
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摘要
由于能源危机和国家和社会可持续发展的要求,有节能环保等特点的现代木结构建筑迅速发展。基于氯化镁无机胶价格低,耐高温等特点,将其应用到木结构建筑中。开展了6个木材胶缝顺纹和横纹的抗剪强度试验,研究了木结构中氯化镁无机胶的胶合能力,并进行了相同条件下普通木梁和无机胶叠合木梁抗弯性能的对比试验研究,得到了试件受弯状态下的破坏形态和机理。结果表明:木材胶缝顺纹剪切强度约为木材胶缝横纹剪切强度的5.1倍;无机胶叠合木梁受弯破坏呈脆性特征;结构胶对叠合木梁的各部分协同工作起关键作用。
Because of the energy crisis and the national and social requirements of sustainable development,the wood-structure building which has the advantages of energy conservation and environmental protection develops rapidly. Magnesium chloride inorganic glue is applied to timber structures for its characteristic of low price and high temperature resistance. The paper tests the bonding capacity of magnesium chloride inorganic glue through the six shear strength tests which includes parallel to grain and perpendicular to grain,studies the flexural behavior which consists of two test specimen,and analyzes the failure mode and mechanism under the state of the bending. The results show: the shear strength of longitudinal timber is much better than cross the grain; the bending failure of composite beams is brittle failure; the glue plays a vital role in working together for composite beam.
Because of the energy crisis and the national and social requirements of sustainable development,the wood-structure building which has the advantages of energy conservation and environmental protection develops rapidly. Magnesium chloride inorganic glue is applied to timber structures for its characteristic of low price and high temperature resistance. The paper tests the bonding capacity of magnesium chloride inorganic glue through the six shear strength tests which includes parallel to grain and perpendicular to grain,studies the flexural behavior which consists of two test specimen,and analyzes the failure mode and mechanism under the state of the bending. The results show: the shear strength of longitudinal timber is much better than cross the grain; the bending failure of composite beams is brittle failure; the glue plays a vital role in working together for composite beam.
引文
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[2]刘俊杰.CFRP加固木梁承载性能的理论与试验研究[D].西安:西安建筑科技大学,2011.
[3]周乾,闫维明,关宏志,等.故宫太和殿静力稳定构造研究[J].山东建筑大学学报,2013,28(3):215-219.
[4]陆伟东,杨会峰,刘伟庆,等.胶合木结构的发展应用及展望[J].南京工业大学学报(自然科学版),2011,33(5):105-110.
[5]刘长安,仝晖,刘甦.当代木构建筑设计——以山东建筑大学雪山书苑为例[J].山东建筑大学学报,2011,26(3):290-294.
[6]Serrano E.,Gustafsson P.J.,Larsen H.J..Modeling of fingerjoint failure in glued-laminated timber beams[J].Journal of Structural Engineering.ASCE.2001,127(8):914-921.
[7]GB 50005—2003,木结构设计规范[S].北京:中国建筑工业出版社,2003.
[8]GB/T 50329—2002,木结构试验方法标准[S].北京:中国建筑工业出版社,2002.
[9]ASTM D143,Standard Test Methods for Small Clear Specimens of Timber[S].Philadelphia:American Society for Testing and Material,2000.
[10]ASTM D198,Standard Test Methods of Static Tests of Lumber in Structural Sizes[S].Philadelphia:American Society for Testing and Materials,2002.
[11]姬卓.CFRP材料加固木梁性能研究[D].上海:上海交通大学,2009.
[12]刘伟庆,杨会峰.工程木梁的受弯性能试验研究[J].建筑结构学报,2008,29(1):90-95.