期刊论文

中文

公路工程

1674-0610

2018

43

6

22-25,121

10.3969/j.issn.1674-0610.2018.06.005

国家国际科技合作专项(2014DFA53120) 国家林业公益性行业科研专项(201304504-3)后续研究。

本校为第一机构

采用兴安落叶松板材、水基聚氨酯胶粘剂,分5层板胶合,制作含有不同胶缝缺陷率的3组胶合木梁试件,胶缝缺陷设置在梁的跨中。通过静力弯曲破坏试验,测试构件应力、变形及极限承载力。试验表明,胶合木梁弯曲破坏属于脆性破坏,存在受拉区外侧木纤维被拉断及胶缝缺陷处破坏两种正常破坏形态。胶缝缺陷使得木梁抗弯刚度和承载能力均降低,胶缝缺陷率2%、4%的木梁相对胶合完好的构件,极限承载能力分别降低8. 8%、13. 5%;正常使用承载能力分别降低11. 3%、14. 7%。承载能力降低幅度与胶缝缺陷率不完全成比例关系,是由于内层胶缝缺陷比外层胶缝缺陷对木梁抗弯能力影响小的原因,这表明木梁抗弯承载能力不仅...

In this paper,employing Xingan larch plank and water-based polyurethane adhesive,three groups of five-layer glulam beams were manufactured and each has different rate of glue line defects,the glue line defect is located in the midspan of the beam.The strain,deformation and ultimate bearing capacity of the components are tested by static bending destructive test.Tests showed that the bending failure of glulam beam belongs to brittle failure,there are two kinds of normal failure modes,which are the lateral wood fiber of the tensile zone is broken and the glue line defect is damaged.The flexural ...