Open Access
ARTICLE
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:
Structural Durability & Health Monitoring 2020, 14(3), 229-248. https://doi.org/10.32604/sdhm.2020.09104
Received 12 November 2019; Accepted 03 March 2020; Issue published 14 September 2020
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.
Keywords
Cite This Article
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.
Citations