古建筑落叶松木构件自然老化材性变化研究
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故宫博物院

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TU531.1

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Study on properties change under natural aging of ancient building larch members
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the Palace Museum

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    摘要:

    为探究古建筑木构件自然老化材性变化,以距今约350年的一段古建筑华北落叶松木构件及与其具有相似年轮宽度的落叶松新材为研究对象,加工标准力学试件,测定试件的材性参数(颜色、全干密度、力学性能参数)及无损检测参数(微钻阻力值、超声波波速),对比分析自然老化木材试件的无损检测参数与材性参数的变化及分布规律,并基于所测得的新旧材两类试件的材性及无损检测参数建立了落叶松木材物理力学性能参数的多元回归模型;研究结果表明:所测老化木材试件物理力学参数及无损检测参数均衰减明显,且颜色具有极显著差别;同时自然老化木材试件各参数变异系数均高于新材试件,但两者均符合正态分布,所建立的落叶松木构件物理力学性能参数的评估模型具有较高评估性能。

    Abstract:

    In order to explore the change of wood properties of ancient building members under natural aging, a part of larch (Larix principis-rupprechtii Mayr) timber member of ancient building, which is about 350 years old, and a new timber with the same species and similar annual wheel width were used in this study. Small clear specimens were processed to measure the material properties (color, dry density and material mechanics property parameters) and non-destructive testing (NDT) parameters (micro-drill resistance value and velocity of ultrasonic wave). The nondestructive testing, physical and mechanical properties parameters of specimens were compared to analyze the variation and distribution, and then the multiple regression model for the physical and mechanical properties of ancient building timber were established based on the parameters measured in this study. The study results showed that the measured material properties parameters and NDT parameters of the natural ageing wood specimens were significantly attenuated. And there is a highly significant difference in the color of natural aging specimens and new timber specimens. It was also found that the coefficients of variation of the parameters of natural aging specimens were all higher than that of new timber specimens, but both of them conformed to a normal distribution. Moreover, the developed model for the evaluation of physical and mechanical property parameters of larch timber members has good evaluation performance.

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  • 收稿日期:2021-10-22
  • 最后修改日期:2021-11-26
  • 录用日期:2021-12-18
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