BASIC TIMBER DESIGN CONCEPTS FOR BRIDGES

BASIC TIMBER DESIGN CONCEPTS FOR BRIDGES INTRODUCTION For thousands of years, TIMBER BRIDGES and other TIMBER structures were built primarily by trial and error and rule of thumb. Designs were based on past experience, and little concern was given to efficient material usage or economy. As the complexity of structures increased, more attention was focused on the importance of accurate engineering methods. Research was undertaken to develop DESIGN criteria for wood with the same level of accuracy and reliability available for other engineering materials. As a result, developments in TIMBER DESIGN have advanced substantially in this century. Although wood is orthotropic and differs in many respects from other materials, wood structures are designed using many of the same equations of mechanics developed for isotropic materials.

values should be viewed only as the basis or starting point for determining the allowable values to be used for design. An abbreviated summary of tabulated values for sawn lumber and glulam is published in AASHTO; however, these values do not include all species and grades and may not be current.

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  Bridge, Basics, Design, Concept, Value, Timber, Determining, Allowable, Basic timber design concepts for bridges, Allowable values

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