KEKUATAN SAMBUNGAN TEGAK (BUTT JOINT) STRUKTUR BALOK LAMINASI (GLULAM BEAMS) DARI KAYU LOKAL
ABSTRACT: In a line with
technology growth in wood working and manufacturing, the require of raw
materialwoodhighly increase. Thats why the efforts for raising the efficient of
wood as one ofconstruction materials is needed. One of the alternatives is
using low quality wood of fast growingwood with laminating technology. This
study purposed to find out the optimum strength of scarfjoint using resin Urea
Formaldehyde and the influence of kemiri (Aleurites moluccana willd)glulam beam
towards the strength. The specimen of glulam beam has size of 75 mm in width,
125mm in thickness, and 2500 mm in length, with two variation of butt joint
placement. Threespeciments are used in each variation of butt joint placement.
Slices of Kemiri wood are laminatedusing Urea Formaldehyde (UA-104) glue with
the thickness of 40/MDGL. The test is carried outby giving lateral static load
on the specimen gradually until the crack of the specimen. The testindicates
that the variation of butt joint placement has no effect to its strength. The
averagemaximum strength of glulam beam BLK 1 is 1570,24 kg; BLK 2 is 1498,78
kg; while for BLKS 3is 1332,21 kg. If compared to the strength of solid beams
of Kemiri wood that is 1093,94 kg,glulam beam has more strength of 34,11 %. The
crack of glulam beams in the tests is started onthe stress area. The crack is
continued on the strain area and followed by the fracture in thebottom of the
wood.
Penulis: Ratna Widyawati
Kode Jurnal: jptsipildd100167
