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Compressive performance of AFRP reinforced laminated bamboo stub columns

Archives of Civil and Mechanical Engineering volume 22, Article number: 31 (2022) Cite this article

Abstract

Engineered bamboo construction can be affected by natural defects, insects, corrosion, etc., which will result in damaging the mechanical properties of structural components. However, traditional reinforcement methods such as setting steel supports and increasing the cross-sectional area of components may cost a lot and cause a negative influence on the appearance of building. Many engineering practices and research works show that applying FRP (Fiber Reinforced Polymer/Fiber) sheet is an economical and efficient method for reinforcing and retrofitting building structures. Therefore, the compressive performance of AFRP (Aramid Fiber Reinforced Polymer/Fiber) reinforced laminated bamboo lumber (LBL) stub columns was studied in this paper. Through six groups (three replicates for each group) of stub columns with six different cloth ratios, the influence of AFRP on the failure pattern and mechanical properties of bamboo columns was explored. The test results showed that AFRP could effectively restrain the lateral deformation and improve the mechanical behavior of LBL columns. With the increase in cloth ratio, the ultimate strength and elastic modulus increased linearly in general, while the Poisson’s ratio gradually decreased. The reduced modulus of reinforced columns in the elastoplastic stage increased up to 161.31% compared with normal columns. Although the ductility of LBL columns laterally wrapped by AFRP was greatly improved, the initial stiffness, yield point and turning points between elastoplastic stage and plastic stage basically remained unchanged in contrast to unreinforced columns. Based on the test results, an empirical equation considering the cloth ratio was proposed to calculate the ultimate strength of AFRP reinforced LBL columns, using ‘Lam and Teng’ model. In addition, a simplified equation was also proposed to calculate the compressive strength of reinforced LBL columns derived from Mises yield criterion. The results of this work can be a reference to promote the application of strengthening and retrofitting engineered bamboo structure with FRP.

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Acknowledgements

The writers gratefully acknowledge Zhen Wang, Ben Chen, Xiaoyan Zheng, Shaoyun Zhu, Liqing Liu, Dunben Sun, Jing Cao, Yanjun Liu and others from the Nanjing Forestry University for helping with the tests.

Funding

This work was supported by the National Natural Science Foundation of China (No. 51878354 & 51308301); the Natural Science Foundation of Jiangsu Province (No. BK20181402 & BK20130978); Postgraduate Research &Practice Innovation Program of Jiangsu Province; six talent peak high-level projects of Jiang-su Province (No. JZ-029); and a Project Funded by the Priority Academic Program Development 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.

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Authors and Affiliations

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

    Chaokun Hong, Haitao Li, Dong Yang & Hang Li

  2. Joint International Research Laboratory of Bio-Composite Building Materials and Structures, Nanjing Forestry University, Nanjing, 210037, China

    Chaokun Hong, Haitao Li, Dong Yang & Hang Li

  3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China

    Chaokun Hong

  4. College of Civil Engineering, Southeast University, Nanjing, 210096, China

    Huizhong Zhang

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

    Rodolfo Lorenzo

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  1. Chaokun Hong
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  2. Haitao Li
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  3. Dong Yang
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  4. Hang Li
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Correspondence to Haitao Li.

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Hong, C., Li, H., Yang, D. et al. Compressive performance of AFRP reinforced laminated bamboo stub columns. Archiv.Civ.Mech.Eng 22, 31 (2022). https://doi.org/10.1007/s43452-021-00354-9

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