含水率对落叶松木材材性检测指标的影响  

Effect of Moisture Content on Wood Properties Deterction Index of Larch

作　　者：程丽婷 戴俭 彭乐鑫 CHENG Li-ting;DAI Jian;PENG Le-xin(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Technology Research Center for Historic Building Protection,Beijing University of Technology,Beijing 100124,China;College of Architecture and Urban Planning,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京市历史建筑保护工程技术研究中心,北京100124 [3]北京工业大学建筑与城市规划学院,北京100124

出　　处：《科学技术与工程》2020年第36期15050-15058,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51678005)。

摘　　要：以落叶松为研究对象,利用无损检测技术,研究不同含水率下木材材性检测指标的变化规律。结果表明:在木材含水率未达到临界纤维饱和点时,木材的材性检测指标随含水率的增大急剧下降;在木材含水率大于临界纤维饱和点时,木材的材性检测指标随含水率的增大下降幅度较小。以木材含水率为单一变量,以木材纤维饱和点(30%)为分界点,建立含水率与落叶松木材材性检测指标的理论公式。用实测结果对理论公式进行修正,修正后的结果表明:材性检测指标的实测值与理论值变化趋势一致,用应力波测量仪和微钻阻力仪测定的波阻模量值的实测值与理论值最接近。同时,推导的理论公式可以作为现场测定木材材性检测指标的依据。Larch was taken into research,and the nondestructive technology was used to study the law of wood property indexes under different moisture contents(MC).The results show that when the MC of wood does not reach the fiber saturation point(FSP),the wood property decreases sharply with the increase of MC.However,when the MC of wood is higher than the FSP,the wood property decreases slightly with the increase of MC.Taking the MC as a single variable and the FSP(30%)as the demarcation point,a set of theoretical formulas for the detection indexes was established.The theoretical formulas were reformulated with the experimental results.The results show that the trend of experimental and theoretical values of the property indexes is consistent.The modulus of stress-resistograph values by the stress wave tester and the micro-drill resistance instrument are very close to the theoretical value.This set of theoretical formulas can be used as a basis for measuring wood properties in the field.

关 键 词：含水率 纤维饱和点 材性检测 应力波传播 修正 

分 类 号：TU531.1[建筑科学—建筑技术科学]