Behavior of CFRP-Strengthened Chamfered Laminated Bamboo Lumber under Eccentric Compression
Publication: Journal of Composites for Construction
Volume 26, Issue 2
Abstract
Laminated bamboo lumber (LBL) is an engineered bamboo with consistent and reliable mechanical properties that can be utilized in structural applications. Experimental studies showed that LBL columns perform well under compression, but the addition of eccentricity could induce excessive tensile stress, which may cause premature failure to bamboo fibers. This paper investigates the use of Carbon Fiber-Reinforced Polymer (CFRP) to suppress cracking of LBL in the tensile zone of eccentrically loaded columns. The mechanical properties of CFRP strengthened chamfered LBL columns with four eccentricity values of 30, 60, 90, and 120 mm were tested. Obtained results were analyzed to propose two analytical models to predict the ultimate bearing capacity of LBL columns under the considered loading case. Test results showed that most of the specimens failed due to delamination at the contact surface between CFRP and bamboo, resulting in fracture of CFRP at the midheight of the column. Consequently, mechanical connections in LBL also failed, and columns suffered a complete failure. Strain distributions within the column cross section showed linear variation showing compatibility with elastic bending theory. LBL columns strengthened using CFRP showed higher resistance under eccentric loading when compared against typical LBL columns; as the eccentricity was increased from 30 mm to 120 mm in 30 mm intervals, the ultimate load increased by 10.9%, 6.3%, 13.7%, and 17.9%, respectively. The results predicted using the two proposed models showed good agreement with test results.
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Acknowledgment
This study was funded by the National Natural Science Foundation of China (Grant Nos. 51878354 and 51308301), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20181402 and BK20130978), Six talent peak high-level projects of Jiangsu Province (Grant No. JZ-029), and Qinglan Project Fund 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 writers gratefully acknowledge Zhen WANG, Hang Li, Ben Chen, Jiachen Lei, Gensheng Cheng, Han Zhang, Nianqiang Zhou, Longlong Zhao, Xiaoyan Zheng, Shaoyun Zhu, Liqing Liu, Junhong Xu, Dunben Sun, Jing Cao, Yanjun Liu, and others from the Nanjing Forestry University for helping with the tests.
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Journal of Composites for Construction
Volume 26 • Issue 2 • April 2022
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© 2022 American Society of Civil Engineers.
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Received: Aug 18, 2021
Accepted: Dec 5, 2021
Published online: Feb 2, 2022
Published in print: Apr 1, 2022
Discussion open until: Jul 2, 2022
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