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Ultimate strength prediction of DRM timber beams by plastic approach:experimental results and discussions

Saleh, Abd. Latif and Mohamed, Zainai and Khin, Maung Zaw and Abu Bakar, Suhaimi (2008) Ultimate strength prediction of DRM timber beams by plastic approach:experimental results and discussions. In: Mechanical Properties And Bending Strength Theory For Malaysian Structural Timber. Penerbit UTM, Johor, pp. 48-66. ISBN 978-983-52-0567-5

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Official URL: https://www.researchgate.net/publication/268256387...

Abstract

A new stress model is developed to predict the ultimate bending strength of solid timber beams by using the principle of plasticity. The model predicts the actual bending strength of timber beams from the ratio of ultimate tensile and compressive strengths of the beam material. Standard bending, tension and compression tests are conducted on structural sized specimens to verify the proposed stress model using a local hardwood timber, Dark Red Meranti (DRM). The experimental results of 12 beams, 10 tension specimens and 15 compression specimens are used to verify the proposed model. Test results showed that there is a significant non-linear relationship of the load and the deformation for timber in bending and in compression, but the stress-strain relationship is linear in tension. The strain is linearly distributed across the beam section throughout the test, and the neutral axis shifts towards the tension side when the beam is loaded beyond the proportional limit. Although the tensile strength of timber is larger than its compressive strength, modulus of elasticity (MOE) in tension and compression is approximately the same. 1.0 INTRODUCTION During the research, bending, tension and compression tests were conducted on structural sized Dark Red Meranti (DRM) timber specimens in accordance with ASTM standard procedures (D 198-84, 1992). A new stress model was also proposed to predict the ultimate bending strength of DRM timber beams. Then, the model was verified by using the experimental results of bending, tension and compression tests. Ultimate tensile and compressive strengths of test specimens were the input parameters in the model. During bending tests, the distribution of strain in mid-section wood fibres, the ultimate load, and the deflection of beams were recorded. The ultimate load and the values of strains at certain load levels were recorded during direct tension and compression tests. Moisture content and density of test specimens were also determined according to ASTM D 4442-92 (1992) and D 2395-83 (1992) procedures.

Item Type:Book Section
Uncontrolled Keywords:plastic, timber beams
Subjects:T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:28060
Deposited By: Fazli Masari
Deposited On:05 Sep 2012 10:19
Last Modified:18 Jun 2017 00:40

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