Study on the Methodology for Reliability-based Bridge Design Considering the Equivalent Scour Load
Date Issued
2014
Date
2014
Author(s)
Chen, Chih-Hao
Abstract
Taiwan is located in a convergent plate boundary. As a consequence, more than two-thirds of this island are rugged mountains, which caused the rivers are steep and have rapid currents. Also, mainly caused by typhoons and the plum rain season, the amount of precipitation is more than 2500mm in Taiwan. These factors result in severe scour problems for cross-water bridges. As the current AASHTO-LRFD bridge design codes did not consider scour effect in the design procedure, the current codes cannot ensure the safety of bridges under scour along with other hazard events.
This study proposed a procedure to evaluate the failure probability of bridges with pile foundations under scour event. Equivalent scour load is used to transfer the scour depth into a load form. By using a series of experimental single-pile bridge lateral loading test, the relation between the reduction of resistance of the bridge pier and the corresponding scour depth is obtained. The revised equivalent scour load formula which can be used for the bridge failure probability estimation is proposed. Also, the scour fragility curves which are related to the flume test result are established. A methodology for bridge design considering scour is also proposed in this study, which could be a reference for the following research on bridge scour issue.
Subjects
橋梁沖刷
等效沖刷作用載重
易損性曲線
SDGs
Type
thesis
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