Structural Characteristic Laminated Timber of Indonesian Timber

International Journal of Innovative Research in Advanced Engineering (IJIRAE) ISSN: 2349-2763
Issue 12, Volume 2 (December 2015) www.ijirae.com
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Structural Characteristic Laminated Timber of Indonesian
Timber
Sri Handayani*
Fakhri Muhammad Woro Yuniarti
Semarang State University Semarang State University Semarang State University
Abstract — Timber is natural resource that inexhaustible if it is managed well. Timber is also called as renewable
resource. And timber include a material which is easily made in to other goods. Meanwhile, structures timber are
expensive and hard to obtain. But, non structures timber which is easily to obtain doesn’t use optimally. There for,
there should be effort of timber processing technology to solve the problem. The using of construction wood is also
limited to the wood which is familiar to society, such as teak, sonokeling, meranti, and the other. Meanwhile, albasia
which is easily to obtain and cheaper doesn’t use optimally. The technologies used in order to support wood as is by
laminated. Laminate is a combination of great variety of one or more by which the material is made into a thin layers
and glued each other so that make a form of larger dimensions. Engineering experiments done by making a
laminated beams of albasia and glugu. And also, laminate or Glued laminated timber (glulam, GLT), a highly
important product of the wood industry and widely applied in construction engineering, is one of the first one-
dimensional structures which, in comparison to single solid wood beams, has a more useable mechanical potential in
strength and stiffness thanks to homogenization effects. The purpose of this research is to know how much the
increases of the flexible strenght of albasia after laminated and how the influence of an adhesive variations.
Keywords— Timber, laminated, Glugu, Albasia, Flexible strength.
I. INTRODUCTION
Indonesian timber is very potential for used as a building material. Timbers are having other advantage if used as
building material, flexible, not easy to broke when being effected of earthquake, not get corrosion from a high humidity
in tropics regions. The use of timber in construction are continues to increase, for structural and non structural. The use
of timber which is redundantly would case availability of timber goes depleted. There for, , there should be effort of
timber processing technology to solve the problem. The using of construction wood is also limited to the wood which is
familiar to society, such as teak, sonokeling, meranti, and the other. Meanwhile, albasia which is easily to obtain and
cheaper doesn’t use optimally. The technologies used in order to support timber as construction material is by laminates.
Laminate is a combination of great variety of one or more by which the material is made into a thin layers and glued
each other so that make a form of larger dimensions. This research was applying laminated technology, using glugu and
albasia as beams laminates. The purpose of this research is to find an increase flexible strenght in beam laminates, and
the influence of an adhesive material variations. The other purposes from this research is to improve the quality of the
wood, the improvement of the quality of albasia, so that can be used as a construction material. This research is expected
to have a benefits, among others: (1) Utilizing wood that is easily obtained and achievable price, to used as glued
laminated timber; (2) Giving counseling to public, about the use of glued laminated timber in construction; (3)
Academically, can provide insight the development of science and technology of glued laminated timber as building
materials.
II. METHODOLOGY
Data collection techniques conducted with methods of observation, which is observing the results of testing using
sheets of observation. The analysis will be used in this research is the descriptive analysis prosentase to observe the
average value of the results of testing the physical properties of wood. Analysis variance be used to analyze the
difference as a result of treatment variation laminates. Object of this research is wood, wood with a different kind. Wood
construction and wood non construction. The variables which was set in the research, among others: (1) Functional: any
laminated wood must be used as its major function for building materials or construction material; (2) Easily obtained:
can be exploited easily; (3) Achievable: glued laminated timber have to be more achieved of wood construction , but with
the same quality. Various type of testing are listed in table 1.
TABLE 1. TESTING SPECIFICATION
Type of Testing Type of Glue Type of Wood Wood Position Information Sample
1. Water content
-
- Albasia
- Glugu
-
5 sample of both
wood, and the
dimension is 3x5x8 cm

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III. TESTING EQUIPMENT
1. Sample Preparation
a. Glugu
Glugu is include the wood which is need long time to grow but multifunctional. Glugu can be used as the
building material, furniture material, bridge emergency and the others. Based on The Regulation of Indonesia
Construction Wood,, glugu include the second wood class. This class is a class which is can be use for
structural material. In this research, glugu’s dimentions which is used are, wide = 5 cm, thick = 1 cm, and
length = 76 cm.
b. Albasia
Albasia is include the wood which fast to grow and easily to obtain. In Indonesia, the wood is very familiar
and abundance. Based on The Regulation of Indonesia Construction Wood, albasia include the fourth wood
class. Class which is can’t use for structural material. In this research, albasia’s dimentions which is used are,
wide = 5 cm, thick = 3 cm, and length = 76 cm. And for beam control, the dimentions are, wide = 5 cm, thick
= 5 cm, and length = 76 cm.
c. Adhesive
This research is using two kind of glue, epoxy and aibon.
2. Tools
a. Crab Machine
b. Machine scales
c. Calipers
d. Saw
e. Oven
f. Clamp
g. Desiccator
h. Digital load detector
i. flexible machine test
2. Weight type
-
- Albasia
- Glugu
-
5 sample of both
wood, and the
dimension is 1x1x4
3. Shear strenght
- Epoxy
- Aibon
- Albasia
- Glugu
5 sample of both
wood, and the
dimension is 3x4x8
4. Prestressed of
block control
- Epoxy
- Aibon
- Albasia
- Glugu
5 sample of both
wood, and the
dimension is 5x5x76
5. Prestressed of
laminated
- Epoxy
- Albasia
- position: albasia in the center of
laminates
- position: albasia in the side of
laminates
5 sample of both glue.
Center dimension: 3
cm. Side dimension: 1
cm.
- Aibon
- Glugu
- position: albasia in the center of
laminates
- position: albasia in the side of
laminates
5 sample of both glue.
Center dimension: 3
cm. Side dimension: 1
cm.

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Fig. 1 Crab machine Fig. 2 Machine scales
Fig. 3 Calipers Fig. 4 Saw
Fig. 5 Oven Fig. 6 Clamp
Fig. 7 Desiccator Fig. 8 Digital Load Detector
Fig. 9 Flexible machine test

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IV.RESULT AND DISCUSSION
The results of this research includes the achievement of the output target of the research, namely data analysis and testing
objects test, as follows: Wood water content; (1.1) albasia water content: the average of albasia water content is 16.62 %,
can be seen on figure 1; ( 1.2 ) glugu water content: the average of glugu water content is 19,83 %, can be seen on a
figure 2; ( 2 ) Wood weight type; ( 2.1 ) albasia weight type: the average of albasia weight type is 0.39 grams/cm3, can
be seen on a figure 3; ( 2.2 ) Glugu weight type: the average of glugu weight type is 0.84 grams/ cm3, can be seen on a
figure 4: (3) Shear strength with adhesive variation; of the results of testing obtained shear strength glued laminated
timber, the average for an adhesive aibon is 39.11 kg/cm2, and to an Adhesive epoxy is 66.717 kg/cm2. Then of these
results, shear strenght greater is that uses an adhesive epoxy, can be seen on the figure 5 and 6: (4) Wood flexible
strenght; (4.1) According to PKKI, albasia included in strong class IV, the average value of flexible strenght 360- 500
kg/cm2, and glugu included in strong class II, and the value of flexible strenght 725-1100 kg/cm2. Can be seen on a
figure 7 to albasia flexible strenght, and figure 8 for glugu flexible strenght and table 2. (4.2) Flexible strength of glued
laminated timber: with differences in variations of adhesive and the position of wood. These differences can be seen from
figure 9, 10, 11, and 12. The biggest flexible strength is made by EPS, with an adhesive epoxy and the position albasia is
in the middle. The result showed that the product increased laminates, strong class IV into a buoyant strong III, with an
increase in 254.025 kg/ cm2 or 59.72 %. Of which initially was strong class IV 425.325 kg/ cm2 become 679.350 kg/
cm2 (class III). Can be seen on a figure 13 and table 3.
Fig. 10 Albasia water content Fig. 11 Glugu water content
Fig. 12 Albasia weight type Fig. 13 Glugu weight type
Fig. 14 Shear strength of laminated timber with aibon Fig. 15 Shear strength of laminated timber with epoxy

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Fig. 16 Shear strength of laminated timber with aibon
Fig. 17 Shear strength of laminated timber with epoxy
Fig. 18 EPG (An adhesive material: glue epoxy, and wood position:
glugu in the middle)
Fig. 19 AIG (An adhesive material: glue aibon, and position wood:
glugu in the middle)
Fig. 20 EPA (An adhesive material: glue epoxy, and position wood:
albasiah in the middle)
Fig. 21 AIA (An adhesive material: glue aibon, and position wood:
albasiah in the middle)
Table 2. Inspection flexible strength of beam control
Inspection Flexible Strenght of Beam Control
No.
Flexible Strenght of Beam Control
Explanation
Albasia Glugu
1. 505.367 811.333
According to The Regulation of Indonesia
Construction Timber, albasia include the fourth wood
class. With the average of flexible strength 360 – 500
kg/cm2
.
2. 350.601 780.925
3. 454.465 736.693
4. 390.598 821.457
Average 425.325 787.602

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Table 3. Flexible strength of beam control
No.
Maximum Loading (kg) Flexible strength of beam control
Explanation
EPG AIG EPA AIS EPG AIG EPA AIS
1. 550 650 850 650 515.498 541.718 708.401 541.718 According to The Regulation
of Indonesia Construction
Timber, glued laminated
timber include the third wood
class. With the average of
flexible strength 500 - 725
kg/cm2
.
2. 690 675 750 600 614.938 564.077 626.752 572.203
3. 600 630 800 730 530.336 586.669 702.897 603.441
Average 613.333 651.667 800 660 554.591 564.155 679.350 572.454
Fig. 21 Flexible strenght of glued laminated timber beam
V. CONCLUSION
After conducting the research, can be concluded that: (1) Prestressed of glued laminated timber with EPG code is
554.591 kg/cm2, and maximum load is 690 kg; (2) Prestressed of glued laminated timber with EIG code is 564.155
kg/cm2, and maximum load is 675 kg; (3) Prestressed of glued laminated timber with EPS code is 679.350 kg/cm2, and
maximum load is 850 kg; (4) Prestressed of glued laminated timber with EIS code is 572.454 kg/cm2, and maximum
load is 730 kg.
The biggest prestressed is made by glued laminated timber with EPS code, with an adhesive epoxy and the position
albasia is in the middle. The result showed that the product increased laminates, strong class IV into a buoyant strong III,
with an increase in 254.025 kg/ cm2 or 59.72 %. Of which initially was strong class IV 425.325 kg/ cm2 become 679.350
kg/ cm2 (class III).
VI. SUGGESTION
From the research that has been done, there are some suggestions that can be concluded to the reader and further
research, among others: (1) Gluing on the side of the wood, possible there are not sticking perfect because the surface of
wood is not uniform, then need more carefulness, because perfection of gluing is make affect of glued laminated timber
strenght. (2) To prevent damage occurs on the surface of glue, need attention in the process of the emphasis of test
objects.
ACKNOWLEDGMENT
The author would to say thank you to Directorate Gendral of Higher Educat (DIKTI) through PKM funding to
support this research.
REFERENCES
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field test with stakes. Philadelpia. 1995.
[3] Fakhri. 2001. Pengaruh Jumlah Kayu Pengisi Balok Komposit Kayu Keruing-Sengon terhadap Kekuatan dan
Kekakuan Balok Kayu Laminasi (Glulam Beams). Universitas Pascasarjana UGM.
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Bagian Utara Jawa Tengah, [Jurnal]. Semarang. Teknik Sipil FT UNNES.
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Structural Characteristic Laminated Timber of Indonesian Timber

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