慈竹基重组竹空心试件受压性能试验研究

作者：钟雪亭¹,余弦¹’²

作者简介：

钟雪亭，工程师，E⁃mail:zxt199268@ foxmail. com

作者单位：

1.四川能投建工集团有限公司，四川成都 610021; 2.重庆大学，重庆 400044

基金项目：

∗四川省科学技术厅重点研发项目（2023YFS0393）；四川能投建工集团有限公司企业研发项目（2023510101002689,2023510101002690）

摘要：

以慈竹基重组竹为原材，制备了分别采用 101 胶和 PUR 胶黏结的空心试件（共 60 根）和对比用实心试件10 根，通过顺纹轴心抗压试验系统分析了结构形式与胶粘性能对其力学行为的相互作用机理。结果表明：所有试件的荷载⁃变形曲线均呈弹性、弹塑性、平台及下降四个阶段，但破坏模式存在明显差异。实心试件因内部剪切超限发生对角线或 Y 形剪切⁃劈裂复合破坏，而空心试件主要因胶层界面失效导致劈裂破坏。延性方面，实心试件延性系数最高（2.09），其次为 PUR 胶空心试件（1.42），101 胶空心试件最低（1.03）。结构性能上，空心试件在减重11%的同时，轴向刚度提升超过 8%（PUR 胶 8.34%、101 胶 8.03%），抗压强度平均值亦有显著提高（PUR 胶提升18.12%,101 胶 5.84%），但考虑安全系数与离散性后，其设计值反而降低。研究表明：空心结构在轻量化和刚度优化方面具备优势，但胶层界面可靠性仍需提升；实心结构表现出更好的延性和破坏预警能力。

关键词：绿色建材；竹结构；重组竹；慈竹；破坏模式；力学性能

English：

Using Neosinocalamus affinis⁃based reconstituted bamboo as the raw material, hollowspecimens （ 60 in total ） bonded with 101 adhesive and PUR adhesive respectively, and 10 solidspecimens for comparison were prepared. Through axial compression tests along the grain, the interactionmechanism between structural form and adhesive performance on their mechanical behavior wassystematically analyzed. The results indicate that the load⁃deformation curves of all specimens exhibitedfour stages: elastic, elastoplastic, plateau, and descending, but their failure modes showed significantdifferences. Solid specimens failed due to diagonal or Y⁃shaped shear⁃splitting composite failure causedby internal shear overloading,while hollow specimens mainly failed due to splitting caused by adhesivelayer interface failure. In terms of ductility, solid specimens had the highest ductility coefficient （2. 09），followed by PUR adhesive hollow specimens （ 1. 42），with 101 adhesive hollow specimens being thelowest （ 1. 03）。 Regarding structural performance,while reducing weight by 11%, hollow specimensachieved an axial stiffness increase exceeding 8%（8. 34% for PUR adhesive, 8.03% for 101 adhesive），and their average compressive strength also improved significantly（18. 12% increase for PUR adhesive,5.84% for 101 adhesive）。 However, considering safety factors and data dispersion, their design valuesdecreased. The study shows that hollow structures offer advantages in lightweight design and stiffnessoptimization, but the reliability of the adhesive interface requires improvement; solid structuresdemonstrate better ductility and failure warning capability.

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