Xing Ze, Wei Yang, Zhao Kang, Lu Jinwei, Wei Baoxing, Lin Yu
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
Jiangsu Carbon Sequestration Materials and Structural Technology of Bamboo & Wood Research Center, Nanjing Forestry University, Nanjing 210037, China.
Materials (Basel). 2025 Jul 31;18(15):3607. doi: 10.3390/ma18153607.
Bamboo scrimber is an environmentally friendly biomass building material with excellent mechanical properties. However, it is susceptible to delamination failure of the transverse fibers under compression, which limits its structural performance. To address this problem, this study utilizes steel tubes to encase bamboo scrimber, forming a novel bamboo scrimber-filled steel tubular column. This configuration enables the steel tube to provide effective lateral restraint to the bamboo material. Axial compression tests were conducted on 18 specimens, including bamboo scrimber columns and bamboo scrimber-filled steel tubular columns, to investigate the effects of steel ratio and loading mode (full-section and core loading) on the axial compression performance. The test results indicate that the external steel tubes significantly enhance the structural load-bearing capacity and deformation capacity. Primary failure modes of the composite columns include shear failure and buckling. The ultimate stress and strain of the structure are positively correlated with the steel ratio; as the steel ratio increases, the ultimate stress of the specimens can increase by up to 19.2%, while the ultimate strain can increase by up to 37.7%. The core-loading specimens exhibited superior load-bearing capacity and deformation ability compared to the full-section-loading specimens. Considering the differences in the curves for full-section and core loading, the steel tube confinement coefficient was introduced, and the predictive models for the ultimate stress and ultimate strain of the bamboo scrimber-filled steel tubular column were developed with accurate prediction.
竹篾层积材是一种具有优异力学性能的环保型生物质建筑材料。然而，它在受压时横向纤维容易发生分层破坏，这限制了其结构性能。为了解决这个问题，本研究采用钢管包裹竹篾层积材，形成一种新型的钢管内填竹篾层积材柱。这种结构使钢管能够为竹材提供有效的横向约束。对包括竹篾层积材柱和钢管内填竹篾层积材柱在内的18个试件进行了轴向压缩试验，以研究含钢率和加载方式（全截面加载和核心加载）对轴向压缩性能的影响。试验结果表明，外部钢管显著提高了结构的承载能力和变形能力。组合柱的主要破坏模式包括剪切破坏和屈曲。结构的极限应力和应变与含钢率呈正相关；随着含钢率的增加，试件的极限应力可提高达19.2%，而极限应变可提高达37.7%。与全截面加载试件相比，核心加载试件表现出更好的承载能力和变形能力。考虑到全截面加载和核心加载曲线的差异，引入了钢管约束系数，并建立了钢管内填竹篾层积材柱极限应力和极限应变的预测模型，预测精度较高。
