Train-Track-Bridge Dynamic Interaction on a Bowstring-Arch Railway Bridge: Advanced Modeling and Experimental...

Area of Science:

• Structural Engineering
• Railway Engineering
• Computational Mechanics

Background:

• Accurate modeling of train-track-bridge interaction is essential for railway safety and performance.
• Previous models often simplify complex dynamic behaviors, necessitating validation against real-world data.

Purpose of the Study:

• To validate a 3D dynamic interaction model of a train-track-bridge system on a bowstring-arch railway bridge.
• To assess the model's accuracy in predicting dynamic responses under operational conditions.

Main Methods:

• Finite element models for train, track, and bridge subsystems were developed and calibrated.
• An uncoupled computational approach (TBI software) was used, employing iterative procedures for compatibility.
• Experimental tests under traffic actions, synchronized by GPS, provided validation data.

Main Results:

• The model accurately reproduced upward deck displacements and alternating rail stresses, characteristic of arch bridges.
• Train speed significantly influenced bridge acceleration responses.
• A very good correlation was achieved between numerical predictions and experimental measurements (accelerations, displacements, strains).

Conclusions:

• The validated 3D dynamic interaction model provides a reliable tool for analyzing complex train-track-bridge behaviors.
• The model's accuracy is attributed to incorporating train parametric excitation, bridge dynamics, and track irregularities.
• This research contributes to enhanced safety and design optimization in railway bridge engineering.