Physical and strength properties of Bambusa striata
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Strength properties of round bamboo Bambusa striata were determined under static bending and compression parallel to grain tests in air dry and green conditions taking with node and without node at centre of the test specimens from bottom, middle & top portions of the culms. The results show that strength properties i.e. fibre stress at elastic limit (FS at EL), modulus of rupture (MoR), modulus of elasticity (MoE), and maximum crushing stress (Max. CS) are always found higher in air dry than green condition. The presence of node at the centre of the specimen increases strength properties i.e. FS at EL, MoR, and MoE (except Max. CS) significantly in green condition. However difference in ‘Max. CS’ determined in presence and absence of node at the centre of the specimens is found to be statistically non –significant at 95% confidence level. The result also indicates that strength properties occurs maximum at the top and minimum at the middle portion and wall thickness minimum at top and maximum at bottom portion of the bamboo. Bambusa striata species has also been classified (strength wise) on the basis of MoE, MoR, and Max. CS in green condition and found to fall in Group-III for construction purposes.
KeywordsSp. gr. FS at EL MoR MoE Max. CS Wall thickness
The authors are thankful to the Director, Forest Research Institute, Dehradun for encouraging and providing facilities for carrying this work. Authors are also thankful to the Head, Forest Products Division, Dr. Sadhana Tripathi, Scientist–G, Forest Products Division and staff of Timber Mechanics Discipline for providing guidance, encouragement as and when required and for technical support.
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