Transcription of BASIC TIMBER DESIGN CONCEPTS FOR BRIDGES
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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.
Timber bridges are designed according to the principles of engineering mechanics and strength of materials, assuming the same basic linear elastic theory applied to other materials. The method used for design is the allowable stress design method, which is similar to service load design for structural steel.
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