铝-木组合柱蠕变性能及其预测模型构建
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云南省昆明市盘龙区白龙寺300号西南林业大学土木工程学院

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TU366

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国家自然科学(52268051);云南省教育厅科学研究(2024Y604)


Creep Behavior of Aluminum Wood Composite Columns and Its Prediction Model Construction
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School of Civil Engineering,Southwest Forestry University

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    摘要:

    木材在长期荷载作用下产生的蠕变会使木梁或木柱的变形增大,给建筑结构带来安全隐患。为改善木构件的蠕变性能,设计一种铝合金-木组合柱(aluminum wood composite columns,AWC),制作铝合金含量分别为0、2%、3%、4%的AWC,开展0.25应力比下柱的蠕变试验,试验持续时间30天。获取蠕变应变-时间曲线和蠕变系数-时间曲线,分析AWC蠕变变化规律。采用Burgers模型对蠕变应变-时间曲线进行拟合,探究铝合金含量对AWC蠕变影响;从AWC材料特性和荷载传递两个方面分析铝合金对AWC蠕变抑制的原因。结果表明:与铝合金含量为0的AWC1相比,AWC2~AWC4蠕变变形呈现不同程度减小,即铝合金能有效增强木材抵抗蠕变变形能力;基于Burgers模型拟合的4条AWC蠕变应变-时间曲线相关系数均大于0.95,且以此模型构建的AWC铝合金蠕变预测模型能较好地预测AWC蠕变。

    Abstract:

    The creep of wood under the action of long-term load will increase the deformation of wooden beams or wooden columns, and bring hidden safety risks to the building structure. In order to improve the creep performance of wood components, an aluminum wood composite columns (AWC) was designed to make AWC with 0,2%, 3%, 3% and 4% respectively. The creep test of 0.25 stress ratio of the lower column lasted 30 days. The creep strain-time curve and creep coefficient-time curve were obtained and the AWC creep pattern was analyzed. Use burgers model to fit the creep strain-time curve to explore the influence of aluminum alloy content on AWC creep; analyze the causes of AWC int creep inhibition from AWC material characteristics and load transfer. The results show that, compared with AWC 1 with aluminum alloy content of 0, the creep deformation of AWC 2 ~ AWC 4 decreases to different degrees, that is, aluminum alloy can effectively enhance the creep deformation ability of wood; The four AWC creep strain-time curve correlation coefficient based on burgers model are greater than 0.95, and the creep prediction model constructed by this model can predict the AWC creep.

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李洪毅,徐国林,陈顺超,等. 铝-木组合柱蠕变性能及其预测模型构建[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-13
  • 最后修改日期:2024-04-28
  • 录用日期:2024-05-22
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