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Length effect on bending properties and evaluation of shear modulus of parallel bamboo strand lumber

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Abstract

One hundred sixty-two parallel bamboo strand lumber (PBSL) beams were tested for the bending properties under three-point bending with variable span. Two typical failure types were classified, type I was tension failure of the bamboo fiber located below the neutral axis at mid-span, while type II was shear failure which was mainly found in specimens with large depth-span ratio. The shear modulus \({\text{G}}_{{{\text{LR}}}}\) of PBSL was also calculated according to Timoshenko’s bending theory. To evaluate the shear modulus, 45° off-axis compression tests had been done. The results showed that the mean values of shear modulus for \({\text{G}}_{{{\text{LT}}}}\), \({\text{G}}_{{{\text{TR}}}}\), and \({\text{G}}_{{{\text{LR}}}}\) are 1254.5 MPa, 408.1 MPa, and 716.4 MPa, respectively. The bending test result was compared with the shear modulus measured by 45° off-axis compression test. It was found that the shear modulus measured by three-point bending test with variable span was significantly less than the shear modulus obtained by 45° off-axis compression test. The empirical equation of shear factor s corresponding to depth-span ratio h/l was proposed. The calculation results gained from the proposed formula are in good agreement with the 45° off-axis compression test results.

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Acknowledgements

The study is supported by the National Natural Science Foundation of China (51878354 & 51308301), the Natural Science Foundation of Jiang-su Province (No. BK20181402 & BK20130978), Six Peak High-level Talents Project of Jiangsu Province, Postgraduate Research & Practice Innovation Program of Jiangsu Province, and Qinglan Project of Jiangsu Higher Education Institutions. Any research results expressed in this paper are those of the writer(s) and do not necessarily reflect the views of the foundations. The authors gratefully acknowledge, Zhenhua Xiong, Huizhong Zhang, Ke Zhou, Zhen Wang, Hang Li, Xiaoyan Zheng, Shaoyun Zhu, Liqing Liu, Dunben Sun, Jing Cao, Yanjun Liu, Junhong Xu and others from the Nanjing Forestry University for helping with the tests.

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Authors and Affiliations

  1. College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China

    Dong Yang, Haitao Li, Chaokun Hong & Huizhong Zhang

  2. Joint International Research Laboratory for Bio‑composite Building Materials and Structures, Nanjing Forestry University, Nanjing, 210037, China

    Dong Yang, Haitao Li, Chaokun Hong & Huizhong Zhang

  3. Jiangxi Feiyu Bamboo Stock Co. Ltd, Fengxin, 330700, China

    Dongdong Wei & Conggan Yuan

  4. University College London, London, WC1E 6BT, UK

    Rodolfo Lorenzo

  5. University of Naples Federico II, Via Claudio 21, 80133, Naples, Italy

    Ileana Corbi & Ottavia Corbi

  6. Ganzhou Sentai Bamboo Company Ltd, Ganzhou, 341001, China

    Zhenhua Xiong

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  1. Dong Yang
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  2. Haitao Li
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Correspondence to Haitao Li.

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Yang, D., Li, H., Wei, D. et al. Length effect on bending properties and evaluation of shear modulus of parallel bamboo strand lumber. Eur. J. Wood Prod. 79, 1507–1517 (2021). https://doi.org/10.1007/s00107-021-01714-1

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