Maintenance planning optimization for deteriorating bridges considering related risks
| Autor: | Yen-Shun Hsu, 許硯舜 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 Making an efficient maintenance plan with limited funding is the toughest segment for the bridge management organization. Since the bridge structure is very complicated and the maintenance process is multiform and full of uncertainty, adopting a suitable strategy for bridge maintenance is not only an interesting but also a critical problem. Conventionally, the bridge maintenance usually goes with the criterion which is called “Fix it while it is damaged!” Such a manner not only raises the risks of the users, but also causes a huge waste in social resource and funding. For the reasons above, the bridge maintenance strategy must be reformed to save the maintaining cost and provide a reliable safeguard. Most bridge maintenance system models are established to minimize the life-cycle maintaining cost of the deteriorating bridges. In this study, we propose a novel strategy to build the bridge maintaining model from a different viewpoint. Based on the tradeoff between bridge performance and maintenance cost, we consider the risks associated with bridge deterioration and maintenance cost. With this approach, the proposed bridge maintaining model can be more realistic and more flexible. In this study, we consider the tradeoff between bridge condition index, safety index, and maintenance cost in life-cycle. The maintaining strategy is made by combining both active and passive maintenance. By different maintaining strategies, Particle Swarm Optimization is used as the search engine to find the optimal maintenance time in life-cycle. Moreover, with the Monte-Carlo simulation, the uncertain risk of bridge deterioration and maintaining cost are incorporated into the study. With the time-varying bridge performance index, the proposed bridge maintaining strategy can provide proper condition index and safety index with different maintenance budget. For the decision maker, the bridge maintaining strategy is no longer being limited with minimizing the cost. Depending on the relative importance, the managers may place on various objectives under consideration, which provide much more flexibility to select the final compromise maintenance solution. At last, an example is used to validate the result of model. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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