scholarly journals Studi Eksperimental Kuat Tumpu Baut Sejajar Serat Metode Lubang Penuh dan Setengah Lubang

2021 ◽  
Vol 6 (3) ◽  
pp. 155
Author(s):  
Erma Desmaliana ◽  
Nessa Valiantine Diredja ◽  
Oki Bernadi
Keyword(s):  
Specific Gravity ◽  
Experimental Testing ◽  
Testing Methods ◽  
Bearing Strength ◽  
Bolt Diameter

ABSTRAKKuat tumpu baut merupakan salah satu parameter penting dalam menentukan suatu sambungan baut. Berdasarkan persamaan SNI 7973:2013, kuat tumpu ditentukan berdasarkan berat jenis kayu, diameter pengencang, dan arah serat kayu. Pada penelitian kali ini terdapat dua metode pengujian eksperimental yaitu metode lubang penuh dan metode setengah lubang berdasarkan ASTM D5764-97a (2002). Pengujian dilakukan menggunakan kayu Mahoni dengan sejajar arah serat dan tiga variasi diameter baut yaitu 1/2 inchi, 5/8 inchi dan 3/4 inchi yang dibandingkan dengan analisis teoritis berdasarkan SNI 7973:2013. Hasil penelitian menunjukan bahwa pengujian eksperimental kuat tumpu baut memiliki nilai yang lebih besar dibandingkan dengan persamaan berdasarkan SNI 7973:2013, dengan nilai persen beda untuk pengujian metode lubang penuh sebesar 22,914% untuk sampel a; 5,806% untuk sampel b; 3,759% untuk sampel c; sedangkan untuk pengujian menggunakan metode setengah lubang sebesar 20,927% untuk sampel AA; 16,954% untuk sampel BB; 15,326% untuk sampel CC.Kata kunci: kuat tumpu baut, sejajar serat, SNI 7973:2013 ABSTRACTBolt bearing strength is one of the important parameters in bolt connetion design. According to the SNI 7973:2013, bearing strength is determined based on specific gravity of timber, diameter of fasterner and direction of timber grain. In this research, there are two experimental testing methods, full hole and half hole testing based on ASTM D5764-97a (2002). Mahogany timber with parallel grain direction was carried out in this test using three variations of bolt diameter, which are 1/2 in, 5/8 in and 3/4 in. This study compares the value of bolt bearing strength with theoritical analysis based on SNI 7973:2013. The result showed that the experimental of bearing strength had a greater value than the equation of theoritical analysis based on SNI 7973:2013, with percentage of difference for full hole testing are 22.914% for sample a, 5.806% for sample b, 3.759% for sample c, while the percentage of difference for half hole testing are 20,297% for sample AA, 16.954% for sample BB, and 15.326% for sample CC.Keywords: bolt bearing strength, parallel grain, SNI 7973:2013

scholarly journals Evaluasi Kuat Tumpu Alat Sambung Baut pada Papan WPC dari Limbah Sengon dan Plastik HDPE

2016 ◽  
Vol 22 (2) ◽  
pp. 129
Author(s):  
Yudhi Arnandha ◽  
Iman Satyarno ◽  
Ali Awaludin ◽  
Arfiati Fardhani
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Shear Wall ◽  
High Shear ◽  
Wood Plastic Composite ◽  
Bearing Strength ◽  
Plastic Composite ◽  
Structural Purpose ◽  
High Shear Strength ◽  
Bolt Diameter

Wood Plastic Composite (WPC) is wood based material that been produce by mixing sawdust as main composition and plastic polymer as bonding agent. Nowadays, WPC board already been produced in Indonesia using Sengon sawdust and recycle HDPE plastic. Sengon sawdust was used as WPC since its availability from plywood production waste, moreover HDPE plastic considered had higher strength and more rigid than PET plastic. WPC occasionally being used as non structural material, moreover from previous study about mechanical properties of WPC, it was found that WPC Sengon has high shear strength around 25 – 30 MPa. These lead that WPC Sengon had a potential used as shear wall sheathing, thus additional research need to be conducted in order to study the type of bolt and diameter of the bolt can be used for these shear wall. This study aimed to investigate the dowel bearing of bolt using full hole method based on ASTM D5764 with type and bolt diameter as specimen variation. Two types of bolt were used in this study; stainless bolt and standard bolt with diameter each of 6 mm, 8 mm, 10 mm and 12 mm. According to ANOVA, there was insignificant result between stainless bolt and standard one, but there was significant result based on diameter of the bolt. Hereafter, it can be recommended the used of 10 mm diameter of bolt for structural purpose with dowel bearing strength around 67 – 70 MPa.

scholarly journals Comparison of Parallel Dowel-Bearing Strength of Mengkulang, Kempas and Pine Glulam between ASTM D 5764-97a and BS EN 383: 2007

2018 ◽  
Vol 7 (3.11) ◽  
pp. 206
Author(s):  
Nor Jihan A. Malek ◽  
Rohana Hassan ◽  
Azmi Ibrahim ◽  
Hussein M. H. Almanea ◽  
Tee H. Hean
Keyword(s):  
Moisture Content ◽  
Strength Test ◽  
Wood Moisture Content ◽  
Timber Species ◽  
Wood Moisture ◽  
Bearing Strength ◽  
Significant Parameter ◽  
Different Types ◽  
Wood Grain ◽  
Bolt Diameter

Dowel-bearing strength is a significant parameter for designing wood connection. The strength of timber connection can be influenced by the bolt diameter, wood grain direction either parallel or perpendicular, thickness of wood, moisture content and other parameters. The dowel-bearing strength test was conducted with a 12 mm bolt diameter dowel, for three different types of timber species, which were mengkulang (Heritiera sp.), kempas (Koompassia malaccensis) and pine (Pinus sp.) glulam. The dowel was placed parallel to the timber grain direction with a glue line at the center of the half-hole test. The 5% diameter offset load (F5%) for dowel-bearing strength (Fy) was determined by using the ASTM D 5764-97a whereas the dowel-bearing strength (Fh) was determined based on BS EN 383: 2007. The results of the three different types of wood showed that the Malaysian timber kempas and mengkulang were 51.740% and 32.966%, respectively, which were higher than the European timber pine. The results of the dowel-bearing strengths (Fh), which were based on the BS EN 383: 2007 gave higher values compared to ASTM D 5764-97a.  

Analytical tools to predict changes in properties of oriented strandboard exposed to the fungus Postia placenta

Holzforschung ◽  
2006 ◽  
Vol 60 (3) ◽  
pp. 332-338 ◽  
Author(s):  
Scott M. Kent ◽  
Robert J. Leichti ◽  
Jeffrey J. Morrell ◽  
David V. Rosowsky ◽  
Stephen S. Kelley
Keyword(s):  
Weight Loss ◽  
Shear Strength ◽  
Specific Gravity ◽  
Near Infrared ◽  
Oriented Strand Board ◽  
Nir Spectroscopy ◽  
Coefficient Of Determination ◽  
Multivariate Statistical ◽  
X Ray ◽  
Bearing Strength

Abstract Weight loss, specific gravity and strength are traditional measures of how wood changes after fungal exposure. This study investigated the effects of fungal decay on properties of oriented strand board (OSB) made of aspen including weight loss, specific gravity, dowel-bearing strength, shear strength, and alkali solubility. Shear strength and alkali solubility were strongly correlated with specific gravity. In addition, X-ray densitometry and near-infrared (NIR) spectroscopy were used to study the decay process. X-Ray densitometry was used to assess localized density around the dowel-bearing embedment zone of a nail. A statistical model using the specific gravity directly under the nail from dowel-bearing strength tests as the explanatory variable had a higher coefficient of determination than models using the gross specific gravity of the sample. Predictive models using NIR spectro-scopy, in combination with multivariate statistical methods, showed promise as predictors of weight loss, shear strength, dowel-bearing strength, and solubility.

scholarly journals Selected Problems of Experimental Testing Marine Stern Tube Bearings

2019 ◽  
Vol 26 (2) ◽  
pp. 142-154
Author(s):  
Agnieszka Barszczewska ◽  
Ewa Piątkowska ◽  
Wojciech Litwin
Keyword(s):  
Experimental Testing ◽  
Experimental Tests ◽  
Main Shaft ◽  
Testing Methods ◽  
Wide Range

Abstract This paper presents typical methods for conducting experimental tests on main shaft slide bearings. There are described their possible testing capabilities, advantages, drawbacks and limitations. Various testing methods were analyzed to find a solution able of providing a wide range of possible investigations at possibly acceptable limitations.

scholarly journals IMPROVEMENT OF THEORETICAL COMPETENCE OF BEGINNER ATHLETES IN CYCLIC SPORTS

2020 ◽  
Author(s):  
Viktoriia Bohuslavska ◽  
Іvan Hlukhov ◽  
Maryn Pityn
Keyword(s):  
Theoretical Analysis ◽  
Experimental Testing ◽  
Training System ◽  
General Level ◽  
Initial Training ◽  
Testing Methods ◽  
Interactive Tools ◽  
Literary Sources ◽  
Legislative Framework ◽  
Effectiveness Of Training

Introduction. Despite the constant modernization of the athletes’ training system, as well as the existing legislative framework aimed at innovative transformations in the field of physical education and sports, currently, there is no information on the use of interactive tools in the theoretical training of athletes in cyclic sports, and it does not meet modern requirements for training athletes. The study aimed to compare the effectiveness of training with the use of traditional and author’s interactive tools of theoretical training of beginner athletes in cyclic sports. Material and methods. In this work, the following research methods were used: theoretical analysis and generalization of literary sources, pedagogical observation, pedagogical experiment, pedagogical testing, methods of mathematical statistics. The study included 36 people involved in kayaking and canoeing at the stage of initial training. The sports experience of the subjects was 1-2 years, qualification at the level of III sports categories. Classes on the developed programs were conducted in the preparatory period of the macrocycle. Results. Training, in which only the theoretical training tools recommended by the curriculum were used, proved to be ineffective in most sections of knowledge at the stage of initial training of athletes. Training sessions with the use of interactive tools proved to be more effective than classes that used only the theoretical training tools recommended by the curriculum. Conclusions. Classes with the use of interactive theoretical training tools contributed more to the increase of the general level of theoretical training of young rowers at the stage of initial training - up to 57,4 % (p < 0.05) than classes using only theoretical training tools recommended by the curriculum. - up to 40,8 % (p < 0.05). Prospects for further research in this direction include the development and experimental testing of the author’s interactive tools for theoretical training, which will increase the level of theoretical training of athletes at different stages of training in cyclical sports.

Evaluation of experimental testing methods for the design of permeable friction course mixtures

2019 ◽  
Vol 206 ◽  
pp. 385-396 ◽  
Author(s):  
Yongchang Wu ◽  
Huaxin Chen ◽  
Qinwu Xu ◽  
Zhen Zhang ◽  
Fangfang Jiao
Keyword(s):  
Experimental Testing ◽  
Testing Methods

scholarly journals A new slip surface in noncohesive slopes

2022 ◽  
Vol 1212 (1) ◽  
pp. 012033
Author(s):  
J A Repadi ◽  
F Bari ◽  
F A Ismail ◽  
A Andriani ◽  
A Hakam
Keyword(s):  
Experimental Method ◽  
Slip Surface ◽  
Experimental Testing ◽  
Testing Methods ◽  
Sand Material ◽  
Slope Safety

Abstract Determining the slope slip surface is difficult, prominent and uncertain. Slip-surface are utilized to estimate slope safety. This study aimed at investigating the slip surface caused by statistical loads by using experimental testing methods. The experimental method was conducted by providing a statistical load on the sand slope The load was used until the slope collapsed. Sand slopes were modeled in a glass box measuring 110 cm x 40 cm x 10 cm. The sand material used was sand that passed through sieve no.10 and was held by sieve no. 200. At a distance of 2.5 cm horizontally and at a distance of 5 cm vertically, colored marks were used to see the pattern of grain movement. Observations were conducted until the slope collapsed. The collapse pattern revealed in the experimental method is non-circular.

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