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
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