کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
804276 | 1467876 | 2013 | 10 صفحه PDF | دانلود رایگان |
• Framework is proposed to generate state-dependent fragility curves of bridges using vibration measurement data.
• The framework is demonstrated and validated through fragility analysis of a two-span reinforced concrete bridge.
• Developed bridge fragility curves are used for the prediction of bridge reliability under future events.
• Predicted reliability values are in well agreement with the physical damage observed in the bridge.
This study provides a framework that integrates bridge condition (or state) with vulnerability assessment of bridges under external loading. The proposed framework is demonstrated by developing state-dependent fragility curves of a two-span reinforced concrete bridge. Condition of the bridge at various post-loading stages are identified using vibration measurement data obtained from a series of shake table tests. Extended Kalman filter method is used for such identification of bridge condition in terms of effective stiffness values. Identified stiffness values are employed in finite element models of the bridge to represent damaged bridge conditions at different phases of the experimental program. For each bridge condition, time history analyses are performed with a suite of earthquake ground motions and state-dependent seismic fragility curves of the bridge are developed. Result shows substantial increase in bridge seismic vulnerability as condition of the bridge degrades during successive shake table tests. It is further shown that the developed state-dependent fragility curves can successfully predict bridge reliability for experimental loading stages.
Journal: Probabilistic Engineering Mechanics - Volume 33, July 2013, Pages 116–125