Surjono Surjokusumo
Fakultas Kehutanan, Institut Pertanian Bogor, Kampus IPB Darmaga Bogor, Jawa Barat, 16680.

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Rasio Ikatan Pembuluh sebagai Substitusi Rasio Modulus Elastisitas pada Analisa Layer System pada Bilah Bambu dan Bambu Laminasi Bahtiar, Effendi Tri; Nugroho, Naresworo; Karlinasari, Lina; Darwis, Atmawi; Surjokusumo, Surjono
Jurnal Teknik Sipil Vol 21, No 2 (2014)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Anatomi bambu disusun oleh sel-sel yang heterogen. Komponen anatomi bambu yang memberikan sumbangan terbesar pada sifat mekanisnya adalah ikatan pembuluh, sehingga kerapatan ikatan pembuluh dapat digunakan sebagai variabel dasar untuk menganalisa sifat mekanis bambu. Kerapatan ikatan pembuluh bergradasi dari tepi hingga ke dalam bambu sehingga dapat diturunkan suatu fungsi linier ataupun non linier sebagai pendekatannya. Rasio modulus elastisitas (E) yang lazim digunakan pada metode transformed cross section, pada penelitian ini dicoba diganti dengan rasio ikatan pembuluh dengan asumsi bahwa keduanya adalah ekuivalen. Hasil penelitian memperlihatkan bahwa terdapat nilai korelasi Pearson yang tinggi antara hasil teoritis dan hasil empiris, sedangkan hasil uji t-student data berpasangan menunjukkan bahwa tidak ada perbedaan yang signifikan antara keduanya. Dengan demikian model transformasi yang diturunkan dapat digunakan untuk melakukan analisa layer system pada bilah bambu maupun bambu laminasi dengan hasil yang dapat dipertanggungjawabkan. Dari ketiga model transformasi terpilih (linier, logaritmik, dan power) model power adalah model yang terbaik karena menghasilkan nilai yang paling mendekati data empiriknya.Abstract. Bamboo anatomy is constructed from many types of cells. Vascular bundles are the cells which give the highest contribution to the bamboo strength, thus the density distribution of vascular bundles could be used as the main variable for analyzing the layer system of bamboo strip and laminated bamboo. The density of vascular bundles distribution degrade from outer to inner in a regular manner which could be fitted by linear and nonlinear function. Ratio of modulus of Elasticity (E) which widely used in transformed cross section method for analyzing the layered system was substituted by ratio of density distribution of vascular bundles within assumption that both are highly correlated. The data in this study proved that there was high Pearson’s correlation between the theoretical and empirical result, and the paired t-student test also showed both were not significantly different; thus the new method could be applied in very good result. There are three model applied in this study namely linear, logarithm, and power. Power model is the best among others since its theoretical results the nearest estimation to the empirical measurement.
Keandalan Papan Lapis dari Kayu Damar (Agathis loranthifolia Salisb.) Terpadatkan sebagai Pelat Buhul pada Arsitektur Konstruksi Atap Kayu The Strength of Densified Agathis (Agathis loranthifolia Salisb.) Plyboard as Gusset in Wood Roof Construction Rilatupa, James; Surjokusumo, Surjono; Nandika, Dodi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 2, No 1 (2004): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

The aim of this research is to know the densified agathis plyboard characteristics and reliability is used for semi isotropic gusset in wood roof construction, and also to look for suitable models of its connectors for roof construction.  The material use for this research is agathis board with dimension of 36 cm (L) x 12 cm (T) x 2 cm (R).  This board has been densified until it reached 1 cm in thickness (R). Glue used for this research is epoxy with the trade name Eurepox-710 (resin) and mixed with Euredur-140 (hardener).  The bolt used for the testing of embedded strength is bolt St.37 with diameter of 11.12 mm.The result showed that densification could increase physical nature and mechanical strength. The physical nature and mechanical strength also indicated that densified agathis board could be used as gusset in wood roof construction.  Results of bolt embedded strength and its ANOVA showed that the gusset of densified agathis plyboard will be reliable for each connection angles, and indicated that the Hankinson theory could not be implemented to forecast the bolt embedded strength for another connection angles. Based on questioners model of the gusset will revealed which is in accordance with the roof construction as issued for the second drawing of the gusset for each connection type.  This model has been considered to posses aesthetical and harmonically features wood roof construction of a building