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TIMBER BRIDGES IN THE UNITED STATES.
| 题名： | TIMBER BRIDGES IN THE UNITED STATES. |
| 作者： | Duwadi-SR; Ritter-MA |
| 关键词： | TIMBER-BRIDGES; TIMBER-CONSTRUCTION; BUILDING-MATERIALS; LIGHTWEIGHT-MATERIALS; STRENGTH-OF-MATERIALS; CHEMICAL-DEICING-AGENTS; RESISTANCE-MATER; DEMONSTRATION-PROJECTS; INTERMODAL-SURFACE-TRANSPORTATION-EFFICIENCY-ACT; WOOD-STRUCTURES |
| 摘要： | Timber bridges represent about 7 percent of the bridges listed in the National Bridge Inventory. In the early years of this nation, timber was the material of choice for bridges. However, wood was gradually replaced by iron, steel, and concrete in the late 19th and early 20th centuries. Wood is a desirable bridge construction material because it is a renewable resource that is resistant to the effects of deicing agents and can sustain substantially higher loads over a short period of time. Wood is also lightweight and easier to fabricate and construct, and it can be constructed regardless of the weather and without detriment to the material. This article presents a historical perspective on the use of timber bridges, briefly describes the various types of timber bridges, and summarizes the national timber bridge demonstration and research programs. |
| 总页数： | Public Roads. 1997. Winter 60(3) pp32-40 (6 Phot., 5 Fig., 13 Ref.) |
| 报告类型： | 科技报告 |
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