Strength of structural timber members with finger-joints and metal plate connectors
Finger jointing of short off-cuts for structural purposes particularly for lightweight roof truss and prefabricated timber house is likely an economical method of minimizing waste and generating benefits. The primary goal of this research is on the possibility of using finger-jointed timber wi...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8220/1/24p%20DAVID%20YEOH%20ENG%20CHUAN.pdf http://eprints.uthm.edu.my/8220/ |
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| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English |
| Summary: | Finger jointing of short off-cuts for structural purposes particularly
for lightweight roof truss and prefabricated timber house is likely an economical
method of minimizing waste and generating benefits. The primary goal of this
research is on the possibility of using finger-jointed timber with metal plate
connectors for structural purposes, i.e. in trusses: internal members, top and
bottom chord. This research assessed the strength properties of finger-jointed
strength group B timber and the influence of number of joints and its positioning
on strength. The glue applied for finger jointing is polymer isocyanate adhesive
or commercially known as Koyo glue. Bending, compression and tension tests
were carried out and the results show that the efficiency of the joints in relation to
the strength of the unjointed specimens were greatly influenced by the
positioning and number of joints. The results obtained from tests indicated that
modulus of rupture decreases with the presence of finger joint while modulus of
elasticity is not affected. Tests on the performance of connection with metal plate
using finger-jointed timber showed small difference in the basic working load as
compared to the unjointed specimens. The study suggests that the combination
use of finger-jointed timber with metal plate connector for structural purposes is
acceptable depending on the joint efficiency, the position and number of the
finger joint in the member, and the type of stresses (i.e. compression, tension or
bending) in the member. |
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