期刊
JOURNAL OF BRIDGE ENGINEERING
卷 21, 期 10, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)BE.1943-5592.0000931
关键词
Scour; Vibrations; Frequency; Soil stiffness; Bridges; Structural health monitoring (SHM)
资金
- Earth and Natural Sciences (ENS) Doctoral Studies Programme
- Higher Education Authority (HEA) through Programme for Research at Third Level Institutions (PRTLI-5)
- European Regional Development Fund (ERDF)
- European Union SMART RAIL [285683]
- European Union H2020 project DESTination RAIL [636285]
Bridge scour is the number one cause of failure in bridges located over waterways. Scour leads to rapid losses in foundation stiffness and can cause sudden collapse. Previous research on bridge health monitoring has used changes in natural frequency to identify damage in bridge beams. The possibility of using a similar approach to identifying scour is investigated in this paper. To assess if this approach is feasible, it is necessary to establish how scour affects the natural frequency of a bridge, and if it is possible to measure changes in frequency using the bridge dynamic response to a passing vehicle. To address these questions, a novel vehicle-bridge-soil interaction (VBSI) model was developed. By carrying out a modal study in this model, it is shown that for a wide range of possible soil states, there is a clear reduction in the natural frequency of the first mode of the bridge with scour. Moreover, it is shown that the response signals on the bridge from vehicular loading are sufficient to allow these changes in frequency to be detected. (C) 2016 American Society of Civil Engineers.
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