| Abstract |
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Geometrical shape of bamboo usually assumed as tapered hollow pipe. This study proved that the dimensional changes along the bamboo stem significantly affected to its Modulus of Rupture (SR) value which measured from third point loading bending test. Therefore if the bending test applied using third point loading configuration, the SR value should be adjusted by strength ratio of taper (Ct). Ct is the ratio between (SR) calculated in the center span and the maximum bending stress along the bamboo beam. This study resulted mathematical formulae to calculate the Ct value for overall range of bamboo taper based on six species namely Tali (Gigantochloa apus (Bl.Ex Schult.f) Kurz), Hitam (Gigantochloa atroviolaceae Widjaja), Andong (Gigantochloa psedorundinaceae), Ampel (Bambusa vulgaris Schrad), Gombong (Gigantochloa verticillata (Willd) Munro), and Mayan (Gigantochloa robusta Kurz). The first tree species were obtained from the Bogor market, while the others were harvested from bamboo clumps in Arboretum Bamboo – Bogor Agricultural University. Then the formula was applied to sketch the graphical style in order to simplify the result. |
