文献类型：期刊文献

中文题名：古建用落叶松木材物理力学性能预测及其影响因素

英文题名：Prediction of physical and mechanical properties and influencing factors of larch wood in historic buliding

作者：袁霄[1,2] 钟慧娴[1,2] 钟永[2] 陈勇平[1,2]

第一作者：袁霄

机构：[1]中国林业科学研究院生态保护与修复研究所,北京100091;[2]中国林业科学研究院木材工业研究所,北京100091

年份：2024

卷号：9

期号：2

起止页码：63-69

中文期刊名：林业工程学报

外文期刊名：Journal of Forestry Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2023】；CSCD:【CSCD_E2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2019SY033);国家重点研发计划(2020YFC1522402)。

语种：中文

中文关键词：古建筑;木构件;落叶松木材;物理力学性能;无损检测

外文关键词：historic building;wooden component;larch wood;physical and mechanical property;non-destructive testing

分类号：S781.2

摘要：为实现对木结构古建筑的预防性保护,有必要对木构件的材质性能进行及时有效的预测和评价。采取小试样-缩尺-足尺递进的方式,将微钻阻抗仪和应力波检测等无损检测方法与实验室物理力学性能测试相结合,构建并检验了落叶松木材物理力学性能与微钻阻抗值和波阻模量关系预测模型,进而提出了古建用落叶松木材物理力学性能的现场无损检测分析方法。研究结果表明:落叶松小试件密度与微钻阻抗值呈现明显的线性正相关关系,木材密度与微钻阻抗值线性方程相关系数为0.91;落叶松小试样顺纹抗压强度、抗弯强度及抗弯弹性模量与波阻模量呈现较明显的线性正相关关系,木材顺纹抗压强度、抗弯强度、抗弯弹性模量与波阻模量线性方程相关系数分别为0.86,0.74,0.74;通过微钻阻抗仪和应力波检测可推算落叶松木材物理力学性能。利用小试件测试数据所建立的预测方程进行落叶松大试件物理力学性能推算存在一定的误差,其缩尺试件密度和顺纹抗压强度预测值与实际值平均偏差分别为12%和16%,足尺试件密度和顺纹抗压强度预测值与实际值平均偏差分别为16%和17%。现场预测应同时考虑测试路径因素,自心材至边材区域,落叶松木材密度、顺纹抗压强度、微钻阻抗值沿径向表现为增大趋势,外层微钻阻抗值比整体平均微钻阻抗值大4%~16%。在古建筑木构件强度检测评估中,应进行木构件的整体微钻检测;若条件所限无法进行整体检测时,应针对不同树种的径向变化规律进行微钻阻抗值的修正。
Historic wooden buildings having a long history in China,being a testament to the country s rich cultural heritage.In view of the preventive conservation of historic wooden buildings,it is important to predict and evaluate the properties of wooden components timely and effectively,which can be completed using non-destructive testing to assess the wood structural integrity of the building without any damage.In this study,non-destructive testing techniques like stress wave and micro-drilling resistance were combined with physical and mechanical properties testing in laboratory.The prediction equation of non-destructive testing parameters and physical and mechanical properties of larch wood was established,according to the progressive way of small specimens,reduced-scale specimens and full-scale specimens.Moreover,a field non-destructive testing and analysis method for the physical and mechanical properties of larch wood in historic buildings was proposed.The results showed that,there was an obvious linear positive correlation between the wood density and the micro-drilling resistance in small specimens,and the correlation coefficient of the linear equation between wood density and micro-drilling resistance was 0.91.However,the ultimate compressive strength,modulus of rupture and modulus of elasticity showed an obvious linear positive correlation with modulus of wave-resistance in small specimens.The correlation coefficients of the linear equations of ultimate compressive strength,modulus of rupture,modulus of elasticity and modulus of wave-resistance were 0.86,0.74 and 0.74,respectively.It was proved that the physical and mechanical properties of larch wood can be predicted by micro-drilling resistance and stress wave velocity test.Furthermore,there was a certain error in predicting the physical and mechanical properties of large specimens based on the prediction equation established by the test data of small specimens.The difference between predicted average value for density and compressive strength parallel to grain and the actual average values were 12%and 16%to reduced-scale specimens,and the difference between predicted average values for density and compressive strength parallel to grain and the actual average values were 16%and 17%to full-scale specimens.The testing path factors should be considered in the field testing for wood property,the density,compressive strength parallel to grain,and micro-drilling resistance value of larch wood all showed a gradual increase trend from the heartwood to the sapwood,and the external micro-drilling resistance value was 4%-16%larger than the overall micro-drilling resistance value.The full path micro-drilling test of the wooden component should be performed in the actual testing and evaluation,and if the full path micro-drilling test was limited by condition,the micro-drilling resistance value should be corrected on the basis of radial variation of different wood species.