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Condition Assessment of Timber Bridges. 2. Evaluation of Several Stress-Wave Tools. Forest Service general technical rept.
| 题名： | Condition Assessment of Timber Bridges. 2. Evaluation of Several Stress-Wave Tools. Forest Service general technical rept. |
| 作者： | BRADSHAW, B. K.; ROSS, R. J.; VATALARO, R. J.; WACKER, J. P. |
| 关键词： | *Structural-timber; *Wooden-bridges; *Drilling-machines; *Machine-tools.;Wooden-structures; Evaluation-; Assessments-; Loads-Forces; Deterioration-; Decay-; Timber-construction; Bridge-maintenance; Inspection-; Research-project. |
| 摘要： | Wood deterioration is one of the most common damage mechanisms in timber bridge structures and often inflicts damage internally. This may occur without visible signs appearing on the surface until a members load-bearing capacity has been largely destroyed. Determining an appropriate load rating for an existing timber bridge and establishing rational rehabilitation, repair, or replacement decisions require an accurate assessment of the bridges existing condition. Knowledge of the condition of the bridge can lead to savings in repair and replacement costs by minimizing labor and materials and extending its life. In timber bridge structures, the degradation of a load- bearing (in-service) member may be caused by any one of several organisms that derive their nourishment or shelter from the wood substrate in which they live. For example, several types of fungi attack wood. The hyphae of these fungi secrete enzymes that depolymerize the chemical components of wood, thereby lowering the density, strength, and hardness of a member. This results in a significant reduction in load-carrying capacity, which in turn may result in the members failure. |
| 报告类型： | 科技报告 |
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