Pradeep, Amal (2025) Dynamic Amplification Effect on Bridges under Traffic Loads: Parametric Study and Novel Design Integration Approach. Masters thesis, Concordia University.
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Abstract
Bridges are critical infrastructure that significantly contribute to connectivity and economic growth. Ensuring their durability necessitates addressing dynamic effects from traffic loads, quantified through the Dynamic Amplification Factor (DAF). This factor, influenced by bridge and vehicle parameters, poses challenges for accurate assessment due to the complex interplay of these factors.
This study undertook a comparative analysis of analytical models and revealed that DAF can be reliably estimated using bridge parameters. Results highlighted notable DAF variations even among bridges with similar spans and frequencies, exposing limitations in current design codes. While dynamic amplification generally decreased with increasing bridge span, the reduction also depended on bridge frequency. Higher vehicle velocities elevated DAF, but no consistent trend emerged due to the influence of bridge characteristics.
A 3D Finite Element Model in Abaqus, incorporating skew angles through the Vdload subroutine, showed minimal DAF variation for skew angles up to 30°, with a 20% increase observed at 45°. These findings emphasize the significance of skew angles on dynamic amplification.
The study proposes a DAF estimation approach based on bridge span and frequency. Validation against dynamic load test data showed consistency in 15 of 17 cases, with an error margin below 5%. A regression-based formula was developed, demonstrating alignment with existing codes while identifying inadequacies in DAF values for short to medium-span bridges.
| Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering |
|---|---|
| Item Type: | Thesis (Masters) |
| Authors: | Pradeep, Amal |
| Institution: | Concordia University |
| Degree Name: | M.A. Sc. |
| Program: | Civil Engineering |
| Date: | 21 January 2025 |
| Thesis Supervisor(s): | Bagchi, Ashutosh |
| Keywords: | Dynamic Amplification Factor (DAF), Bridge parameters, Moving load method, Finite element analysis (FEA), Skew angle impact, Vehicle velocity, Parametric study, Regression analysis. |
| ID Code: | 995042 |
| Deposited By: | Amal Pradeep |
| Deposited On: | 17 Jun 2025 17:23 |
| Last Modified: | 17 Jun 2025 17:23 |
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