Transcription of TYPES OF TIMBER BRIDGES - Forest Products Laboratory
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TYPES OF TIMBER BRIDGES - Forest Products Laboratory
TYPES OF TIMBER BRIDGES INTRODUCTION TIMBER BRIDGES are seen today in many TYPES and configurations. Some of these BRIDGES evolved from designs developed many years ago, while others have developed as a result of modem technological advances in TIMBER design and fabrication. Regardless of the specific configuration, all TIMBER BRIDGES consist of two basic components, the superstructure and the substructure (Figure 2-1). The superstructure is the framework of the bridge span and includes the deck, floor system, main supporting mem bers, railings, and other incidental components. The five basic TYPES are the beam, deck (slab), truss, arch, and suspension superstructures. The substructure is the portion of the bridge that transmits loads from the superstructure to the supporting rock or soil.
truss, parallel-chord designs are practical when vertical clearance is suffi cient for the truss depth and arc especially economical for deep crossings where reduced bent height can result in substructure savings (Figure 2-15). Figure 2-13.__Typical truss …
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