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Numerical Simulation of the Post-Tensioned Beams Behaviour Under Impulse Forces Loading.

Anna Jancy1, Adam Stolarski1

  • 1Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 gen. Sylwestra Kaliskiego Street, 00-908 Warsaw, Poland.

Materials (Basel, Switzerland)
|December 11, 2025
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Summary

Numerical simulations reveal that post-tensioned beams exhibit reduced dynamic load capacity under constant force impulse loads but significantly enhanced capacity under time-varying loads, influenced by prestressing eccentricity.

Keywords:
concrete damage analysisdynamic analysisfinite element method analysisforce impulse loadpost-tensioned beams

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Area of Science:

  • Structural Engineering
  • Computational Mechanics
  • Materials Science

Background:

  • Post-tensioned beams are critical structural elements.
  • Understanding their dynamic behavior under impulse loads is essential for safety.
  • Previous research has focused on static or different dynamic loading conditions.

Purpose of the Study:

  • To numerically simulate and analyze the dynamic behavior of post-tensioned beams under two distinct impulse load types.
  • To investigate the influence of prestressing eccentricity on dynamic load capacity.
  • To compare dynamic and static load capacities.

Main Methods:

  • Utilized the Abaqus program for detailed numerical simulations.
  • Employed concrete damage plasticity and Johnson-Cook models for material behavior.
  • Calibrated dynamic models using experimental and static analysis data.
  • Solved dynamic equilibrium equations using an explicit procedure.

Main Results:

  • Constant force impulse loads resulted in a ~5% decrease in dynamic load capacity compared to static tests.
  • Short-term, time-varying impulse loads significantly increased dynamic load capacity.
  • Higher prestressing eccentricity led to greater dynamic load capacity (211% of static).

Conclusions:

  • The type of impulse load critically affects the dynamic load capacity of post-tensioned beams.
  • Time-varying impulse loads can substantially enhance structural performance beyond static predictions.
  • Prestressing eccentricity is a key parameter influencing dynamic response and capacity.