Axial stress-strain curves for two Bamboo species (Guadua Angustifolia Kunth and Bambusa Oldhamii)
In this paper, experimental stress-strain curves of tensional and compressional tests carried out in Mexico for two bamboo species (Guadua Angustifolia Kunth and Bambusa Oldhamii) as wells as a comparison with those obtained in Ecuador and Colombia, are evaluated. For the Guadua Angustifolia Kunth, similar curve shapes for Mexican, Colombian and Ecuadorean bamboos were observed. This, in despite of variations in the test conditions, physic and geometric specimen properties, and original specimen position in the bamboo culm. Next, through a least square analysis, characteristic equations for these stress-strain curves were obtained. Bambusa Oldhamii species always shown the higher tensional and compressional strengths, 56.1 MPa and 273.3 MPa. Stress-strain curves for theses bamboo species were compared with that of unreinforced concrete. By considering the high strength and ductility capacity, the bamboo has a better behavior under axial stress than the unreinforced concrete and could be used for the building construction.
Keywords: Bamboo, Angustifolia, Oldhamii, Relationship, tension, compression