落叶松材顺纹拉/压-横向剪切复合受力性能研究

谢启芳; 韩永刚; 张利朋; 王莹锦; 吴亚杰

落叶松材顺纹拉/压-横向剪切复合受力性能研究

谢启芳^{1, 3},
韩永刚^{1, 2},
张利朋^{1, 2, ,},
王莹锦^{1, 2},
吴亚杰^{1, 2}

1.
西安建筑科技大学　土木工程学院, 西安 710055
2.
西安建筑科技大学　结构工程与抗震教育部重点实验室, 西安 710055
3.
东北林业大学　土木与交通学院, 哈尔滨 150040

基金项目: 国家自然科学基金 (52408347, 52178303)；陕西省重点研发计划项目(2023-GHZD-03)

详细信息

通讯作者:
张利朋，博士，助理教授，研究方向为木材强度准则与本构、古建筑木结构抗震保护　E-mail: lpgzhang@xauat.edu.cn

中图分类号: TU366.2；TB332
计量
- 文章访问数: 37
- HTML全文浏览量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-01
- 修回日期: 2024-08-05
- 录用日期: 2024-09-03
- 网络出版日期: 2024-09-16

Research on composite mechanical properties of larch under perpendicular-to-grain tension/compression and transversal shear

XIE Qifang^{1, 3},
HAN Yonggang^{1, 2},
ZHANG Lipeng^{1, 2
, ,},
WANG Yingjin^{1, 2},
WU Yajie^{1, 2}

1.
School of Civil Engineering Xi'an University of Architecture & Technology, Xi'an 710055, China
2.
Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture &Technology, Xi'an 710055, China
3.
School of Civil and Transportation Engineering, Northeast Forestry University, Harbin 150040, China

Funds: National Natural Science Foundation of China (52408347, 52178303); Shaanxi Province key research and development plan project (2023-GHZD-03)

摘要

摘要: 实际木结构中木材大多同时受到顺纹正应力与横向剪应力复合作用，掌握其复合受力性能是木结构受力分析的重要基础。研发并制作了一种用于测试木材拉/压-剪切复合受力性能的杠杆加载装置与试件，基于此开展了木材顺纹拉/压、横纹剪切以及顺纹正应力与横向剪应力复合加载试验，其中，剪切荷载由单轴试验机提供、拉/压加载由杠杆装置实现。考察了不同拉/压-剪切应力复合作用下木材试件的破坏形态、应力-应变曲线、拉/压-剪切复合强度特性，进一步考察了经典正交各向异性强度准则对落叶松材拉/压-剪切复合受力强度的表征效果，结果表明，Hill准则、Hasebe准则的适用性最好。研究结果可为木结构的精细化受力分析提供重要借鉴。
- 落叶松 /
- 顺纹拉/压 /
- 剪切 /
- 拉/压-剪切复合受力 /
- 强度与变形 /
- 强度准则
Abstract: The majority of wood within the actual wooden structure experiences a combination of normal stress along the grain and transverse shear stress. A lever-loading device and specimen were developed and manufactured to assess the composite mechanical properties of wood under tension/compression and shear stress. Experiments were conducted to evaluate longitudinal tension/compression, transverse shear, longitudinal normal stress, and transverse shear stress under combined loading conditions. The uniaxial testing machine supplied the shear load, while the lever device facilitated tension/compression loading. The investigation delved into failure modes, stress-strain curves, and composite strength characteristics of wood specimens under various normal-shear combined stresses. Furthermore, the study explored the efficacy of classical orthotropic strength criteria in determining the normal-shear composite strength of wood. Results indicate that Hill criterion and Hasebe criterion exhibited superior performance.These findings serve as crucial reference for the precise stress analysis of wooden structures.
- larch /
- parallel-to-grain tension/compression /
- shear /
- combined tension/compression-shear behavior /
- strength and deformation /
- strength criterion

HTML全文

图 1 试件尺寸 (单位：mm)

Figure 1. Dimensions of wood specimens (unit: mm)

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图 2 试验装置

Figure 2. Test set-up

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图 3 数据测量

Figure 3. Data measurement

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图 4 LR试件破坏形态

Figure 4. Failure modes of LR specimens

f_t,R—Tensile strength of the specimen; f_c,R—Compressive strength of the specimen.

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图 5 LR试件应变分布

Figure 5. Strain contour of LR specimens

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图 6 LT试件破坏形态

Figure 6. Failure modes of LT specimens

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图 7 LT试件应变分布

Figure 7. Strain contour of LT specimens

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图 8 落叶松试件应变分布

Figure 8. Strain distribution of larch wood

"T" is the time it takes to load

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图 9 落叶松试件应力-应变曲线

Figure 9. Stress-strain curves of specimens of larch wood

"DL" means uniaxial tensile loading, "DY" means uniaxial compressive loading, and "J" means shear loading.

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图 10 落叶松试件应力-应变曲线

Figure 10. Stress-strain curves of specimens of larch wood

"LJ" indicates stretch-shear combined loading, and "LY" indicates compression-shear combined loading.

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图 11 落叶松试件抗剪强度、峰值应变和剪切模量的变化

Figure 11. Variation of shear strengths, peak strains, and shear moduli of larch wood

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图 12 落叶松试件强度准则的比较

Figure 12. Comparison of strength criterion of larch wood

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表 1 试件分组

Table 1. Grouping of specimens

Stress	Numbers of normal stress levels	Specimen type
	Numbers of normal stress levels	LR	LT
Uniaxial tension	/	3	3
Uniaxial compression	/	3	3
Shear	/	3	3
Combined tension-shear	4	12	12
Combined compression -shear	3	9	9
Notes: In LR and LT specimens, "L" is the longitudinal direction of wood, "R" is the radial direction of wood, and "T" is the chord direction of wood, where "L" represents the tensile/compressive loading direction, and "R" and "R" represent the shear loading direction.

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表 2 LR试件材性 (单位：mm)

Table 2. Mechanical properties of LR specimens (unit: mm)

	f_t,R	f_c,R	f_v,R	E_t	E_c	G
Mean value	60.24	44.67	10.72	48481.33	7809.29	1322.89
Coefficient of variation	7.71%	2.72%	2.85%	27.22%	21.52%	9.08%
Notes: “f_t,R” is tensile strength, “f_c,R” is compressive strength, “f_v,R” is shear strength, “E_t” is tensile modulus, “E_c” is compression modulus, and “G” is shear modulus.

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表 3 LT试件材性(单位：mm)

Table 3. Mechanical properties of LT specimens (unit: mm)

	f_t,R	f_c,R	f_v,R	E_t	E_c	G
Mean value	47.17	50.16	12.20	19333.0	15121.60	1279.15
Coefficient of variation	8.34%	1.83%	5.91%	12.83%	18.71%	4.92%

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表 4 木材强度准则强度预测能力评估指标

Table 4. Evaluation index of strength prediction ability of wood strength criteria

strength criteria	k
strength criteria	First quadrant	Second quadrant	Total
Hill-t	3.10	12.50	15.59
Hill-c	2.40	9.03	11.43
Van der put	8.72	9.22	17.94
Hasebe	3.19	3.93	7.12
SIA 265	6.44	10.20	16.64
Note: "k" is the sum of the ratio of the absolute residual value of each data point to the test value.

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