摘要
针对古建筑木结构保护修缮特点,对5种木材的横纹弦向、径向以及斜向局部压缩破坏过程进行试验观察并分析。结果表明:木材局部承压破坏时横截面产生水平裂缝,承压板两侧木材起翘突出,直接承压部分密实化;针叶树种横纹局部承压力-位移曲线为具有平台段的3段式曲线,阔叶树种横纹局部承压力-位移曲线则不具有明显的平台段;针叶树种横纹局部抗压强度与晚材率成正比关系;木材横纹局部抗压强度高于横纹全截面抗压强度。
Considering the protecting and repairing features of historic timber buildings, the local compression damage process on the crosswise grain of 5 types of woods in tangentiaU radial and slant direction were evaluated. The study showed that, there were horizontal cracks on the crosssection with local bearing damage. Timber on two sides of the bearing plate became warped and prominent-while the others under the bearing plat became densification. The local bearing stress-strain curves of coniferous trees have the characteristics of three-region curves with platform regions ^ while the curves of broad-leaved trees have no obvious platform regions. The local across compression strength of coniferous trees was proportional to the latewood percentage. The local compression strength perpendicular to the grain was higher than fullcross section compression strength of the wood.
出处
《中国科技论文》
CAS
北大核心
2016年第13期1452-1456,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(51338001
51278324)
关键词
木材横纹
局部承压
破坏特征
抗压强度
perpendicular to the grain
locally loaded
failure characteristics
compressive strength
