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

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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