冻融循环处理对重组竹抗压弹性模量与抗压强度的影响

邸静; 伍锴杰; 郭楠; 梅力丹; 吕佳峰; 邬明桃; 罗晓英; 王桐

doi:10.12326/j.2096-9694.2025146

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冻融循环处理对重组竹抗压弹性模量与抗压强度的影响
Effect of Cyclic Freeze-Thaw Treatment on the Elastic Modulus and Strength of Bamboo Scrimber under Compression
1.福建农林大学交通与土木工程学院，福建福州，350002
2.三江学院土木工程学院，江苏南京，210012
3.东北林业大学交通与土木工程学院，黑龙江哈尔滨，150040
4.同济大学土木工程学院，上海，200092
5.重庆工商大学，重庆，400067
6.东北石油大学土木工程学院，黑龙江大庆，163319
2026年页码：1-8
DOI： 10.12326/j.2096-9694.2025146
稿件说明：

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邸静, 伍锴杰, 郭楠, 等. 冻融循环处理对重组竹抗压弹性模量与抗压强度的影响[J/OL]. 木材科学与技术, 2026,1-8. DOI： 10.12326/j.2096-9694.2025146.

DI Jing, WU Kaijie, GUO Nan, et al. Effect of Cyclic Freeze-Thaw Treatment on the Elastic Modulus and Strength of Bamboo Scrimber under Compression[J/OL]. Chinese Journal of Wood Science and Technology, 2026, 1-8. DOI： 10.12326/j.2096-9694.2025146.

摘要

重组竹凭借优异的力学性能，其应用领域逐渐扩展到建筑结构行业。作为结构材料，重组竹在冻融环境下的性能劣化机制尚不明确。本研究对比分析了重组竹试件经过0、20、40和60次冻融循环（－20 ℃冷冻8 h、20 ℃水中浸泡8 h为一次循环）处理后，顺纹加载、横纹加载Ⅰ（加载方向垂直于胶层）和横纹加载II（加载方向平行于胶层）下试件的破坏模式、抗压弹性模量和抗压强度。结果表明冻融循环处理并未改变重组竹试件的破坏模式，但各种破坏模式的占比发生变化，其中胶层开裂的比例随着冻融循环次数增加而显著增加（从30%到64%）；不同加载方向测试重组竹的抗压弹性模量和抗压强度均随冻融循环次数增加而降低，其中横纹加载II方向测试试件的降幅分别达38.3%和35.2%。最后确定了重组竹材料抗压设计的特征值，并建立考虑冻融循环次数的衰减模型，为重组竹结构在严寒地区应用的可靠度设计提供数据支撑。

Abstract

Bamboo scrimber (BS)

due to its excellent mechanical properties

has been increasingly utilized in the construction industry. However

as a structural material

the degradation mechanism of BS under cyclic freeze-thaw treatment is not yet clear. This study investigated the failure modes

elastic modulus

and compressive strength of BS specimens subjected to 0

and 60 freeze-thaw (F-T) cycles (each cycle comprising freezing at ⁃20℃ for 8 hours followed by thawing in water at 20℃ for 8 hours) under three loading directions

i.e.

parallel-to-grain loading

perpendicular to grain I loading (perpendicular to the glue layer)

and perpendicular to grain II loading (parallel to the glue layer). The results indicated that while F-T cycling did not change the failure modes of the specimens

it significantly altered the proportions of different failure modes. Notably

the proportion of glue layer cracking increased remarkably with increasing F-T cycles (from 30% to 64%). Both elastic modulus and compressive strength decreased with an increasing number of F-T cycles across all loading directions

with a decrease of 38.3% and 35.2% in the perpendicular to grain II direction

respectively. Finally

the characteristic values for the structural design of BS under compression were derived

and a degradation model considering F-T cycles was established to provide data support for the reliability design of BS structures in cold regions.

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references

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