木材科学与技术2024，Vol.38Issue(6)：39-46,68,9.DOI:10.12326/j.2096-9694.2024020
竖向孔洞对木柱受压承载性能的影响研究
Effect of Vertical Holes on Compressive Bearing Capacity of Timber Columns
摘要
Abstract
The compressive bearing capacity of timber columns with holes is a key research focus in ancient timber structures.In this study,larch wood(Larix sp.),commonly used in ancient buildings,was selected as the experimental material.To investigate the effect of vertical holes on the compressive bearing capacity of timber columns,an artificial opening method was used to simulate internal hole defects.The compressive test was conducted using digital speckle image correlation(DIC)in conjunction with a mechanical testing machine.The compressive failure mechanism in timber columns with vertical holes was examined through the macroscopic and microscopic mechanical properties.The results indicated that,under the conditions of this experiment,the effect of the hole's cross-sectional area on the ultimate load of timber column was greater than that of the hole's longitude direction.Fold failure was the primary compressive failure mode for timber columns with vertical holes,followed by the transverse tearing and oblique shear failure of the wood as displacement increased.Fold failure and oblique shear failure were primarily caused by the buckling of the wood tracheid cell walls,while transverse tearing failure primarily extended longitudinally along the wood tracheid cells resulting in an irregularly serrated cross-section.Additionally,the strain field distribution indicated that stress concentrations in the vertical,transverse stress,and shear stress occurred at the ends of holes,which demonstrated the effectiveness of the DIC method in predicting the damage location in ancient building wood components.This study provides a solid foundation for the protection and repair of ancient timber structures.关键词
带孔洞木柱/受压承载性能/数字散斑图像(DIC)/竖向孔洞/极限荷载/破坏模式/应变场Key words
timber column with holes/compressive bearing capacity/digital speckle image correlation(DIC)/vertical hole/ultimate load/failure mode/strain field分类
农业科技引用本文复制引用
钟慧娴,陈勇平,钟永..竖向孔洞对木柱受压承载性能的影响研究[J].木材科学与技术,2024,38(6):39-46,68,9.基金项目
中央级公益性科研院所基本科研业务费专项资金项目"木质材料功能化处理与评价"(CAFYBB2023PA004) （CAFYBB2023PA004）
"刺入式探测对木柱承载能力的影响机制"(CAFYBB2019SY033). （CAFYBB2019SY033）
