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Ultimate strength prediction of DRM timber beams by plastic approach: theoretical formulation and verification

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: theoretical formulation and verification. In: Mechanical Properties And Bending Strength Theory For Malaysian Structural Timber. Penerbit UTM, Johor, pp. 67-82. ISBN 978-983-52-0567-5

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Official URL: http://www.fka.utm.my/jsb/redzuan/5P/bookchapter_f...

Abstract

Unlike most man-made materials, such as steel and concrete, wood is unique and natural. It is a discontinuous, heterogeneous, orthotropic, inelastic, and hygroscopic material [1]. Throughout history, the unique characteristics and the comparative abundance of wood have made it a natural material for houses, bridges, vehicles, furniture, tools and decorative objects. It has been used for its cheap price, high strength to weight ratio, decoration and availability. Today, wood is prized for a multitude of uses for most of the same reasons. The strength of timber has been a subject of interest and has been studied for a long time since it was used as a structural material. Now, modern computers and advanced theories, such as anisotropic finite-element theory, fracture mechanics, and orthotropic elastic theory, have contributed to the understanding of the mechanical behaviour of wood [1]. However, the existing literature for structural applications of timber is mostly available for softwoods but not so much for tropical hardwoods. The present analysis and design procedures for timber structures are based on elastic analysis and allowable stress design method (ASD) [2,3,4], except for the design of joints where plastic analysis has been established [5]. Hence, it is essential to explore the use of plastic analysis for timber structures, especially for flexural elements, since plastic analysis and load and resistant factor design (LRFD) have been advanced for other structural materials, such as steel and concrete [2,6,7,8]. In this research, bending, tension and compression tests were conducted on structural sized timber specimens in accordance with ASTM D 198-84 procedures [9]. One of the local hardwood timbers, Dark Red Meranti, was chosen as the test material. In the present research, a new stress model was proposed to predict the ultimate bending strength of DRM timber beams. Then, the model was verified by the results of bending, tension and compression tests. Ultimate tensile and compressive strengths of test specimens from established research results were used in the model to compare the strength of DRM timber beams.

Item Type:Book Section
Uncontrolled Keywords:timber beams, plastic
Subjects:T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:28059
Deposited By: Fazli Masari
Deposited On:05 Sep 2012 10:19
Last Modified:05 Sep 2012 10:19

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