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Long-Term Bending Behaviour of Prestressed Glulam Bamboo-Wood Beam Based on Creep Effect

Nan Guo1,*, Huajing Xiong1, Mingtao Wu1, Hongliang Zuo1, Fengguo Jiang2, Xiaofeng Hou3, Dabo Xin1

1 School of Civil Engineering, Northeast Forestry University, Harbin, 150040, China
2 School of Civil Engineering, Heilongjiang University of Science and Technology, Harbin, 150027, China
3 Heilongjiang Metallurgical Design Planning Institute, Harbin, 150040, China

* Corresponding Author: Nan Guo. Email: email

Structural Durability & Health Monitoring 2020, 14(3), 229-248. https://doi.org/10.32604/sdhm.2020.09104

Abstract

Creep is an important characteristic of bamboo and wood materials under long-term loading. This paper aims to study the long-term bending behaviour of prestressed glulam bamboo-wood beam (GBWB). For this, 14 pre-stressed GBWBs were selected and subjected to a long-term loading test for 60 days. Then, a comparative analysis was performed for the effects of pretension values, the number of pre-stressed wires, and long-term load on the stress variation of the steel wire and the long-term deflection of the beam midspan. The test results showed that with the number of prestressed wires increasing, the total stress of the steel wire in the beam midspan and the ratio of the long-term deflection to the total deflection decreases decreased, but when the number of steel wires exceeded 4, the total stress and long-term deflection was less influenced; with the pre-tension value increasing, the ratio of the total stress of the steel wire in the beam midspan and the ratio of the long-term deflection to the total deflection also decreased, but when the prestress force was greater than 3.975 kN, the total stress and long-term deflection were less affected; with the other parameters unchanged, when the value of the long-term load increased, the total stress of the steel wire decreased, and the long-term deflection of the beam midspan increased, which shall be more significant with the long-term load greater than 30% of the standard ultimate bearing capacity. After the test, the experimental data were fitted, and the creep coefficient was given. Finally, the long-term stiffness calculation formula of the pre-stressed GBWB based on creep effect was proposed. The research findings have certain theoretical significance and engineering value.

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APA Style
Guo, N., Xiong, H., Wu, M., Zuo, H., Jiang, F. et al. (2020). Long-term bending behaviour of prestressed glulam bamboo-wood beam based on creep effect. Structural Durability & Health Monitoring, 14(3), 229-248. https://doi.org/10.32604/sdhm.2020.09104
Vancouver Style
Guo N, Xiong H, Wu M, Zuo H, Jiang F, Hou X, et al. Long-term bending behaviour of prestressed glulam bamboo-wood beam based on creep effect. Structural Durability Health Monit . 2020;14(3):229-248 https://doi.org/10.32604/sdhm.2020.09104
IEEE Style
N. Guo et al., "Long-Term Bending Behaviour of Prestressed Glulam Bamboo-Wood Beam Based on Creep Effect," Structural Durability Health Monit. , vol. 14, no. 3, pp. 229-248. 2020. https://doi.org/10.32604/sdhm.2020.09104

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cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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