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Suspension Trail Bridge using Sustainable Materials, Montana

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Abstract:

Construction of the 27,5 m suspension pedestrian bridge over Rattlesnake Creek near Missoula, Montana, did not sacrifice aesthetics, or spare innovation, in providing a valuable link in the city's trail system. Engineers reviewed historic US Forest Service trail suspension-bridge construction, relying on the proven technology to construct a bridge with small-diameter wood (smallwood), salvaged from bug-killed lodgepole pine, and other sustainable design materials. With its lathe-turned native smallwood and subtle arch, the bridge, built with grants including US Forest Service funds, is in harmony with its rustic environment. Most of the bridge is constructed of reused materials. A running surface made of recycled tires covers a composite deck made of waste plastic and sawdust. The 150 mm diameter smallwood members were cut from wasting lodgepole pines and used for floorbeams and braces. Half-rounds were used for the lattice-patterned stiffening trusses that form the bridge's sides. Many ravaged lodgepole pines are salvageable, giving the wood potential as an economical, abundant construction material ideal for trail bridges. Lodgepole pine smallwood is now used in building construction, but the Rattlesnake project was the first bridge built with this locally recycled material. Across the heavily wooded American Northwest, pine bark beetles have killed large areas of lodgepole pines. These standing dead trees are mostly left to waste. There is a tremendous opportunity to develop this resource for constructing buildings and bridges. Smallwood, a 150 to 230 mm material officially known as small-diameter roundwood, is well suited for making joists and intermediate members. Friends of Missoula Parks, a nonprofit group, received a grant from the US Forest Service (USFS) to promote the use of smallwood in constructing a pedestrian bridge over Rattlesnake Creek in a forest near Missoula, Montana.

Keywords: BRIDGE; CABLE SUSPENSION; COMPOSITE LAMINATE; PEDESTRIAN BRIDGE; SMALLWOOD; SUSTAINABLE DESIGN; WOOD/PLASTIC

Document Type: Research Article

DOI: https://doi.org/10.2749/101686608783726722

Publication date: 2008-02-01

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    Structural Engineering International (SEI), the quarterly Journal of IABSE, published since 1991, is the leading international journal of structural engineering dealing with all types of structures and materials. SEI offers its readers a unique blend of short profiles on recent structures, and longer, in-depth technical articles on research, development, design, construction and maintenance. Articles are written by practicing engineers and academia from around the world and reflect the high standards of IABSE. IABSE Peer Review stamps are given to papers that have passed through a highly selective review process and demonstrate a significant contribution to the state of structural engineering knowledge.To recognise contributions of the highest quality, an Outstanding Paper Award is presented each year.

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