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Calculating a Bridge Assessment Dynamic Ratio Using a Bridge Weigh-In-Motion system Jason Dowling Young Researchers Seminar 2009 Torino, Italy, 3 to 5 June 2009

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Overview 1. Bridge Weigh-In-Motion 2. Model Description 3. Assessment Dynamic Ratio 4. Theoretical Simulations - New Algorithm 5. Conclusions Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Instrumented Bridges.... Bridge Weigh-In-Motion Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Moses Algorithm (1979) Bridge Weigh-In-Motion Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Typical ‘Measured’ Response, M me... Bridge Weigh-In-Motion Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Bridge Weigh-In-Motion Calculating a Bridge ADR Using a B-WIM system Jason Dowling x M th...

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Moses Algorithm (1979) Matrix solution technique: Bridge Weigh-In-Motion Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Truck Model... Model Description Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Road ‘Carpet’ Profile Model Description Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Statistical Data - GVW & Velocity - Axle Spacing & Axle Weights Model Description Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Definition: associated with a return period i.e. not a single event. Assessment Dynamic Ratio (ADR) Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Source: SAMARIS (2006) Trends in ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Source: OBrien et. al (2009) Trends in ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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10 years... (500,000 trucks/year) 25m Bridge Class ‘A’ Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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10 years... (500,000 trucks/year) 25m Bridge Class ‘A’ Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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50 years 25m Bridge Class ‘A’ Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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50 years 25m Bridge Class ‘A’ Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Simulation Variability... Five 10 year simulations Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Tendency to under-weigh Steer Axle... Theoretical Simulations - Errors... Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Cause of under-estimation of ADR... Theoretical Simulations - Errors... Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Dynamic Response - Time & Freq. Domains Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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10 Responses represented in the Freq. Domain Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Filtered Response - Time & Freq Domains Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Incorporating filtering of dynamic signal... Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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‘Measured’ Influence Line Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling x New M th...

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Static BM using New Approach Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Example 1: 10 years... Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Example 2: 10 years... Theoretical Simulations - ADR Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Max Static BM Errors using New Approach... Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling Worst Case...

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Worst Case: Max Static BM Error... Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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Worst Case: Max Static BM Error... Theoretical Simulations - New Algorithm Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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In Summary: General ADR trends in keeping with recent findings... The Classic Moses Algorithm over-estimates Maximum Static Strain... Incorporating Filtering of the dynamic signal improves predictions... Conclusions Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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My Thanks to the 6th European Framework Project ARCHES for funding my work. Thank you for listening. Calculating a Bridge ADR Using a B-WIM system Jason Dowling

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