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.
design application, the tabulated values are adjusted by modification factors to arrive at the allowable values used for each design. This ap proach produces more realistic design values for a specific situation. In general terms, the basic timber design sequence is as follows: 1. Compute load effects and select an initial member size and ...
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