Shear Stress of Bamboo Scrimber-Strain Relationship and Extraction of Strength Characteristic Values
-
摘要: 【目的】为了解重组竹的受剪性能并安全高效地应用于结构设计。【方法】对3组不同工况下的重组竹标准小试件进行剪切试验，研究重组竹横纹、顺纹及面内剪切力学性能和应力—应变关系。【结果】重组竹横纹剪切强度最高，平均值为15.49 MPa，约是顺纹剪切强度的2.1倍、面内剪切强度的2.7倍。依据破坏模态对试件进行分类，提出相应的应力—应变表达式，计算曲线与试验曲线拟合较好。【结论】采用参数法和非参数法对试验值进行统计分析，基于试验值计算累积分布函数下5%分位值和75%置信度水平下5%分位值的参数法容许极限(PTL)，认为最优概率分布下的PTL能较好体现重组竹受剪力学特征。Abstract: 【Objective】 In order to comprehend the shear performance of bamboo scrimber and apply it to structure design safely and efficiently. 【Method】 Shear tests on three groups of small specimens of bamboo scrimber under different working conditions were carried out in this study，so as to study the mechanical properties and stress—strain relationship of the strength perpendicular to grain，parallel to grain and in plane shears of bamboo scrimber. 【Result】 The results showed that bamboo scrimber had the highest shear strength perpendicular to grain，the average value was 15.49 MPa，which was around 2.1 times that of shear parallel to grain strength and 2.7 times that of shear in plane. The specimens were classified according to the failure modes，and the relevant stress—strain expression was proposed. The calculation curve fit well with the test curve. 【Conclusion】 The test results were statistically analyzed by using both parametric and non-parametric methods. Based on the test values，the 5% quartile value and the parameter method tolerance limit (PTL) under the 75% confidence level were calculated，and the PTL is considered to better reflect the shearing mechanical characteristics of bamboo scrimber.
-
Key words:
- Bamboo scrimber /
- Shear performance /
- Failure mode /
- Stress-strain relationship /
- Characteristic value
-
包茜虹. 重组竹的应力-应变关系与强度准则[D]. 南京:南京林业大学,2015. 陈复明,李德月,周海英,等. 竹质双拼梁构件研发及其在装配式建筑中的应用[J]. 世界林业研究,2019,32(3):61-66. 国家林业和草原局. LY/T 3194-2020 结构用重组竹[S]. 北京:中国标准出版社,2020. 李延军,许斌,张齐生,等. 我国竹材加工产业现状与对策分析[J]. 林业工程学报,2016,1(1):2-7. 刘其松. 纤维布增强重组竹材的力学性能与耐水性能[J]. 木材工业,2019,33(4):1-4. 上官蔚蔚. 重组竹物理力学性质基础研究[D]. 北京:中国林业科学研究院,2015. 于文吉. 我国重组竹产业发展现状与趋势分析[J]. 木材工业,2012,26(1):11-14. 中华人民共和国建设部. JG/T 199-2007 建筑用竹材物理力学性能试验方法[S]. 北京:中国标准出版社,2007. 钟永. 结构用重组竹及其复合梁的力学性能研究[D]. 北京:中国林业科学研究院,2018. ASTM International. ASTM D2915-17 Standard Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products[S]. West Conshohocken,PA:ASTM International,2017. ASTM International. ASTM D7078/D7078M-20 Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method[S]. West Conshohocken,PA:ASTM International,2020. Chen J P,Guagliano M,Shi M H, et al. A comprehensive overview of bamboo scrimber and its new development in China[J]. European Journal of Wood and Wood Products,2021,79:363-379. Xiao Y,Zhou Q,Shan B. Design and Construction of Modern Bamboo Bridges[J]. Journal of Bridge Engineering,2010,15(5):533-541. -
点击查看大图
计量
- 文章访问数: 113
- HTML全文浏览量: 17
- PDF下载量: 29
- 被引次数: 0
下载:
