J.2 Example FS Standard Design.pdf

This is a U.S. Department of Agriculture Forest Service Standard Trail Plan for a Longitudinal Glulam Deck Panel Trail Bridge (Structure 963). The document provides detailed technical specifications and construction drawings for a glulam trail bridge system suitable for federal highway projects on forest lands.

The bridge design features glued-laminated timber deck panels with a longitudinal configuration, supported by posts spaced at 5-foot maximum intervals. Key structural components include solid sawn or glue-laminated curb members, running planks (2" x 8" minimum), railing systems with posts, backing planks, and sills. The design accommodates pedestrian live loads of 65 to 90 pounds per square foot and ground snow loads ranging from 120 to 200 pounds per square foot, with deck panel depth requirements varying from 5 1/8" to 12 1/4" depending on span length (6 to 30 feet) and loading conditions. Materials specifications require identification number 5 glulam species in wet condition with industrial appearance for deck panels, Southern Pine rough sawn number 2 grade for curb members and sills, and Western Red Cedar select structural grade for treated components. All structural steel hardware must meet AASHTO M270 Grade 50W specifications with galvanized or unfinished finishes. The document includes comprehensive construction details for typical connections, post mounting angles, curb block assemblies, and field treatment procedures for wood preservation using pentachlorophenol or copper naphthenate in light oil. Foundation alternatives and abutment connection details are referenced in supplementary standard drawings 965-10 through 965-40.