Behaviour of timber beams of different species under pure bending and pure torsion / Nordin Hassan

This experimental project which consists the testing of small timber specimens has its main purpose the provision of data for the comparison of the strength properties of different species. Actually, timbers should be tested both in the green condition and in the seasoned condition. But in this experimental project, only timbers in the seasoned (air-dry) were tested due to the inavailability of timbers in green condition. The test results may be used to show the behaviour of timbers involving the pattern of cracks and the relations between load and deflection, and between torque and angle of twist. Furthermore, the results may also be used to determine the relation between strength and such properties as specific gravity and density to determine the effect on strength as to assist in the establishment of design functions for structural timber. The results of tests made with the 2cm. standard, owing to dimensional effect, directly comparable in all properties with those for the 2 in standard. A more extensive comparison with the results tests from laboratory, may be obtained if the results tested in accordance with the former standard are corrected to the equivalent values for the 2 in. standard. Unfortunately, the test with the 2 cm. standard is not done due to the difficulties the preparation of the specimen as well as the test itself. However, with this experimental project, the writer hopes that it will provide some ideas and knowledge to everybody concerning timber beam which is one of the important construction materials.