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通过材性试验研究了竹集成材顺纹单轴应力-应变关系,在此基础上,设计了15个竹集成材简支梁试件,对其受弯性能及破坏机理进行了试验研究。结果表明:竹集成材顺纹单轴拉应力与应变呈线性关系,而其顺纹单轴压应力与应变关系则经历了明显的线性段和非线性段,可由三折线型关系模拟;竹集成材的顺纹抗拉强度比其顺纹抗压强度提高58.7%,而其拉伸弹性模量较其压缩弹性模量高25.4%;竹集成材梁构件在受弯性能试验中,截面应变基本符合平截面假定,且截面中和轴的位置在加载过程中逐渐下移。基于试验研究与理论分析,提出了可用于评估竹集成材梁弯曲性能的分析计算模型,其计算结果与试验结果吻合良好。
Based on the material tests, the uniaxial stress-strain relationship of bamboo composite material was studied. Based on this, 15 bamboo-shaped specimens were tested and their bending behavior and failure mechanism were studied. The results show that the linear uniaxial tensile stress and strain of bamboo composite material have a linear relationship, while the uniaxial compressive stress and strain of the composite grain undergo obvious linear and nonlinear sections, which can be simulated by the relation of three fold line. The tensile strength of the parallel grain was 58.7% higher than that of the parallel grain, while the tensile modulus of elasticity was 25.4% higher than the compressive elastic modulus of the composite. The bending strain of the bamboo composite beam Conforms to the assumption of a flat section, and the position of the section neutral axis gradually decreases during loading. Based on the experimental research and theoretical analysis, the analytical calculation model which can be used to evaluate the bending behavior of bamboo composite beam is proposed. The calculated results are in good agreement with the experimental results.