Nurhayati, Lilis and Dewi, Sri Murni and Wisnumurti, Wisnumurti and Nuralinah, Devi (2025) Identification of the mechanical performance of finger-jointed laminated merbau timber beams reinforced with carbon fiber reinforced polymer (CFRP). Eastern-European Journal of Enterprise Technologies, 6 (7). pp. 30-44. ISSN 1729-3774
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HASIL SIMILARITY-LILIS NURHAYATI-IDENTIFICATION OF THE MECHANICAL PERFORMANCE OF FINGER-JOINTED LAMINATED MERBAU TIMBER BEAMS.pdf Download (7MB) | Preview |
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Abstract
In this research, the mechanical properties and the
reinforcement mechanism of finger-jointed laminated
Merbau beams processed from wood-industry wastes
are investigated and unreinforced specimens and exter
nally U-shaped carbon fiber reinforced polymer (CFRP)
strengthened beams are compared. The problem to be
solved is the brittle failure and reduced flexural capaci
ty of finger-jointed glulam; hence, it determines the com
bined impact of joint orientation (face-finger and face
butt), the number of lamination (three and five layers),
and CFRP reinforcement on block-assembled beams
with randomly distributed finger joints through four
point bending tests. The outcome of the study reveals
that the use of CFRP has a huge impact on the flexur
al performance of the material, with the ultimate load
being increased by 27.4–48.8% and the maximum bending
moment being raised by 45.3% when compared to non-re
inforced beams. The mid-point deflection at the maxi
mum load has also increased by 6.5–51.4%, which shows
a higher capacity for deformation and better ductility of
the material.
The noted enhancements are credited to the success
ful shifting of the stress from the timber tension zone to
the CFRP, lessening of stress concentration at the finger
joint discontinuities, and the crack initiation and prop
agation taking longer time in random locations which
together change the structural response from sudden brit
tle fracture to more stable damage progression leading
up to failure. Among the tested configurations, face-butt
beams have obtained the highest modulus of elasticity of
20.46 GPa (an 8.8% increase), while the five-lamina face
butt configuration strengthened by CFRP has reached
the greatest modulus of rupture of 55.85 MPa (a 33.4%
increase). The three-lamina face-finger beams showed
the highest increase of MOR after reinforcement, being at
48.30 MPa (a 46.4% increase). Changing lamination from
three to five layers raised flexural strength by 18.9%, sug
gesting a homogenization effect that improves stress dis
tribution in laminated beams composed of blocks. All in
all, the collaboration of finger-joint configuration, num
ber of lamination, random block assembly, and CFRP
strengthening has opened a door to convert Merbau
wood waste into higher-performance engineered timber
elements for low-carbon structural applications
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | merbau, glulam, beams, CFRP, reinforce ment, bending, mechanical performance, MOE, MOR |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor > HD28 Management. Industrial Management T Technology > T Technology (General) |
| Divisions: | Fakultas Teknik > Prodi Teknik Industri |
| Depositing User: | Lilis Nurhayati |
| Date Deposited: | 27 Feb 2026 03:51 |
| Last Modified: | 27 Feb 2026 03:51 |
| URI: | https://repositori.ukdc.ac.id/id/eprint/2577 |
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