Identification of the best finger joint configuration for Sri Lankan wood species based on the flexural strength

Influence of geometry on the stiffness of corner finger joints

BioResources ◽

10.15376/biores.14.2.2946-2960 ◽

2019 ◽

Vol 14 (2) ◽

pp. 2946-2960

Author(s):

Gourav Kamboj ◽

Vladimír Záborský ◽

Tomáš Girl

Keyword(s):

Wood Species ◽

Polyvinyl Acetate ◽

Beech Wood ◽

Bending Moment ◽

Elastic Stiffness ◽

Finger Joint ◽

Finger Joints ◽

Number Of Teeth ◽

Fagus Sylvatica L ◽

Wood Strength

Finger joints enable the full utilization of wood. The finger joint technique is used to eliminate wood defects that would otherwise weaken the wood strength. This research project evaluated how the wood species, adhesive type, and number of teeth affect the elastic stiffness of finger joints. The adhesives used were polyurethane and polyvinyl acetate, and the wood species were beech (Fagus sylvatica L.) and spruce (Picea abies L.). This study also determined the elastic stiffness of finger joints with 2 teeth and 5 teeth. For this purpose, the samples were loaded via a bending moment reaction, with tensile or compression forces in the angular plane. The highest elastic stiffness was obtained from the beech wood samples with 5 teeth bonded with polyvinyl acetate adhesive under tensile stress. Therefore, it was concluded that the elastic stiffness increased when the number of teeth increased. However, further studies on the elastic stiffness of finger joints are necessary in relation to the finger teeth length and surface area of the glue between the finger joint connections.

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Experimental study on the effectiveness of finger joint with variations in wood species toward bending strength of glulam beams

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/361/1/012038 ◽

2019 ◽

Vol 361 ◽

pp. 012038

Author(s):

B Anshari ◽

A Rofaida ◽

F Mahmud ◽

Pathurahman ◽

R Rahmalia

Keyword(s):

Experimental Study ◽

Wood Species ◽

Bending Strength ◽

Finger Joint

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Flexural strength properties of glulam made from combining of sago bark and two wood species from West Papua

European Journal of Wood and Wood Products ◽

10.1007/s00107-017-1229-0 ◽

2017 ◽

Vol 76 (1) ◽

pp. 385-388

Author(s):

Wahyudi ◽

Mulyana Arifudin

Keyword(s):

Flexural Strength ◽

Wood Species ◽

Strength Properties ◽

West Papua ◽

Sago Bark

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The flexural strength of glue laminated timber beams based on deflection and strain rate with four point bending loading system

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1212/1/012034 ◽

2022 ◽

Vol 1212 (1) ◽

pp. 012034

Author(s):

S Maricar ◽

K Sulendra ◽

H Listiawaty ◽

H O Baide

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Wood Species ◽

Urea Formaldehyde ◽

Compressive Force ◽

Bending Test ◽

Laminated Beams ◽

Laminated Beam ◽

Four Point Bending ◽

External Reinforcement

Abstract The development of utilization of low quality wood as construction material is needed to reduce the exploitation of natural forests. However, low quality wood species have disadvantages in terms of mechanical properties. The mechanical properties of Sengon wood are relatively low, so it does not qualify as a structural element. Therefore, the system glulam can be applied to overcome this problem. The system glulam can produce relatively light structural elements with adequate performance. This system has been extensively developed, even at the stage of applying external reinforcement, to improve the performance of structural laminated beams. On that basis, this study aims to determine the flexural strength of laminated beams of Sengon wood as a low quality wood species. In order to achieve this goal, the laminated beam was tested using method four point bending test method. Tests were carried out on long span laminated beams (L = 2750 mm) to observe flexural strength. There are five (5) laminated blocks tested, namely (BLS-1, BLS-2, BLS-3, BLS-4 and BLS-5). Each group has dimensions of 55 mm in width and 155 mm in height. Each specimen consists of six layers of wood boards with a density Falcata 0.3 g / cm3. The thickness of each layer was 26 mm and bonded with resin urea formaldehyde cold setting. Double-sided adhesive laying of 350 gr / m2 at a compressive force of 2 MPa. The analysis result shows that the load-deflection relationship between BS-L consists of linear and nonlinear phases. The load performance characteristics of the two types of laminated beams are expressed as the ratio of the proportional limit load to the maximum load. The ratio value is expressed in the form P eBL-s = 0.7P max BL-S andM eBL-s = 0.7M max BL-S. This form is similar to previous studies with a Pe to Pmax ratio of 0.80.9. In this case, the average flexural strength of the laminated beam is 17 MPa with a maximum strain of 0.004.

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