Jemaa, Y, Yeboah, D and Gkantou, M (2024) Flexural performance of glulam timber beams with glued-in BFRP rods connections. Construction and Building Materials, 443. ISSN 0950-0618

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Abstract

Glued-in rods technique (GiR) is an attractive, yet a relatively new, option to effectively connect structural timber members. With timber buildings accounting for almost 90 % of single-storey residential buildings in developed countries, this technique could be an effective answer for the rehabilitation of aging existing timber beams, thus serving to enhance sustainability and circularity in timber construction. Compared to steel rods, the use of fibre reinforced polymer (FRP) rods could provide additional benefits due to lower weight, better corrosion resistance and lower thermal conductivity. Research on the behaviour of members bonded with Basalt FRP glued-in rods is limited. Nevertheless, until now, there is still no guidance for fabrication and design of such members with any type of FRP rods. The present paper reports an experimental programme on the ultimate performance of glued laminated (glulam) timber beams bonded with glued-in BFRP rods. The article's research significance lies in the type, rod arrangement and material of the glued-in rods connection. In particular, the article examines experimentally four connection types, with the key studied parameters being the rod diameter (8 mm and 10 mm) and the rod arrangement (D1: two rows of 2 rods each over the cross-section, one row on the tensile zone and one row on the compression zone; D2: four rods aligned vertically across the beam's depth). Four replicates were tested for each connection type, leading to a total of 16 test specimens. A four-point bending arrangement with a 2300 mm span was adopted to determine the moment capacity of the connections. Load-displacement response and failure mechanisms were monitored and evaluated. The prominent failure mode observed was bar pull-out and tensile splitting of timber. Design D1 connections with 10 mm bars exhibited the best performance in terms of moment capacity and maximum displacement at failure. The article also offers insights into the observed strain and FRP-adhesive-timber bond behaviour of GiR rods via the use of strain gauges attached to the embedded rods. Addressing the absence of design guidance for such members, the paper proposes theoretical models capable of predicting their moment capacity and the rotational stiffness. In particular, the proposed models achieved mean values of 1.15 for the moment resistance and of 0.99 for the rotational stiffness compared to the experimental data.

Item Type:	Article
Uncontrolled Keywords:	0905 Civil Engineering; 1202 Building; Building & Construction
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Divisions:	Civil Engineering & Built Environment
Publisher:	Elsevier
SWORD Depositor:	A Symplectic
Date Deposited:	27 Aug 2024 09:38
Last Modified:	27 Aug 2024 09:45
DOI or ID number:	10.1016/j.conbuildmat.2024.137628
URI:	https://researchonline.ljmu.ac.uk/id/eprint/24016

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