Bridge Scour and Substructure Deterioration: Case Study

Avent, R. Richard; Alawady, Mohammed

doi:10.1061/(asce)1084-0702(2005)10:3(247)

Cited by 28 publications

(10 citation statements)

References 2 publications

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“…It typically results in a loss in foundation stiffness that can compromise structural safety. With regard to scour, visual inspections involve the use of divers to inspect the condition of foundation elements (Avent and Alawady 2005). These types of inspections can be expensive and can have limited effectiveness as inspecting the condition of the foundation can be dangerous in times of flooding, when the risk of scour is highest.…”

Section: Bridge Scourmentioning

confidence: 99%

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

2016

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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 identify 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 is it 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 is 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.

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Section: Bridge Scourmentioning

confidence: 99%

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

2016

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“…Moreover, corrosion of the pile cross-section also contributes to the pile buckling failure. For example, corrosion resulted in approximately 44% reduction of cross-section of timber piles in the Hatchie River Bridge, (Thompson 1990), and 50% reduction of cross-section of steel HP piles in the I-10 Bridge over the Jourdan River in Mississippi (Avent and Alawady 2005). In terms of steel HP shapes, buckling can occur globally (flexural buckling) or locally (local buckling).…”

Section: Vertical Failurementioning

confidence: 99%

Case History Analysis of Bridge Failures due to Scour

Lin¹,

Han²,

Bennett³

et al. 2014

Climatic Effects on Pavement and Geotechnical Infrastructure

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Scour is a major cause for bridge failure. To understand the characteristics of bridge failures under scour conditions and provide useful information for scour countermeasure, this study reviewed and analyzed totally 36 historical cases of bridge failure due to scour, including their hydraulic, geotechnical, and structural conditions and failure modes. Based on the collected data, most of scour depths (i.e. up to 41%) ranged from 0.5 to 5 m, but the maximum scour depth could be up to 15 m. Local scour was accounted for 64% bridge failures, followed by channel migration (14%), and contraction scour (5%). Possible bridge failure modes due to scour included vertical failure, lateral failure, torsional failure, and bridge deck failure. Approximately 70% of bridge failures were lateral and vertical. The findings from this study can be updated when more cases of bridge failure under scour conditions are collected and/or become available.

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“…Following recent failures (Maddison 2012), scour monitoring is receiving increasing interest among asset owners. Traditionally, diving inspections were adopted (Avent and Alawady 2005); however these tend to be subjective, labor-intensive and dangerous to undertake during flooding, when the likelihood of scour occurrence is highest. Moreover, as scour holes tend to refill with sediment upon subsidence of floodwaters, this can pose challenges for the success of visual-based assessment procedures.…”

Section: Introductionmentioning

confidence: 99%

Use of mode shape ratios for pier scour monitoring in two-span integral bridges under changing environmental conditions

2020

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In this paper, a novel pier scour indicator is introduced, which uses the ratio between mode shape amplitudes identified at two points on an integral bridge structure to monitor the progression of scour erosion. The mode shape ratio (MSR) is investigated as an additional parameter to complement the use of changes in natural frequency as a scour indicator. The approach is demonstrated using numerical modelling and the MSR is extracted from acceleration signals arising in the structure due to modelled ambient and vehicle-induced vibrations. The MSR shows higher sensitivity to scour erosion than the more commonly researched natural frequency. Furthermore, the variation in MSR under temperature fluctuations is inversely related to that of frequency, in that it increases with increasing temperature whereas frequency decreases with increasing temperature. This inverse relationship potentially enables the separation of the scour effect from the temperature influence on the dynamics of the system.

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Bridge Scour and Substructure Deterioration: Case Study

Cited by 28 publications

References 2 publications

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

Case History Analysis of Bridge Failures due to Scour

Use of mode shape ratios for pier scour monitoring in two-span integral bridges under changing environmental conditions

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