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<p>This study presents an integrated field-experimental and numerical investigation into the dynamic behavior of a large-span simply supported trough girder bridge under heavy-haul freight trains. Through on-site dynamic load testing and development of a vehicle-bridge coupled finite element model incorporating track irregularities, the bridge responses and train operational indices are quantified, and the impact of changes in cross-sectional height on structural dynamic behavior is further explored. Key findings revealed the following: Experimentally, under 80&#xa0;km/h operation, the mid-span dynamic displacement reaches 2.56&#xa0;mm, with longitudinal stresses of 0.76 and − 1.52&#xa0;MPa. Maximum mid-span accelerations are 0.58&#xa0;m/s² laterally and 1.26&#xa0;m/s² vertically. Near-traveling side responses exceed those on far-travelling side, deck vertical accelerations surpass web upper-flange values, whereas lateral accelerations exhibit an opposite relationship. Simulations indicated that the mid-span bottom plate’s lateral dynamic response is significantly smaller than its vertical response under train passage. The maximum lateral and vertical dynamic displacements are 0.30 and 7.68&#xa0;mm, with accelerations of 0.25 and 3.34&#xa0;m/s², respectively. Train safety indices increase and then decrease with rising speed, and the number of trains significantly affects stability. Increasing the cross-sectional height substantially reduces mid-span bottom plate vertical displacement, vertical acceleration, and lateral acceleration but minimally affects lateral displacement. It also improves web bilateral resistance to vertical vibrations while intensifying its transverse vibrations.</p>

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Dynamic Performance of a Large-Span Simply-Supported Trough Girder with Variable Cross-sectional Height

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Xun Zhang,
  • Baijiao Wang,
  • Yingming Zhen,
  • Guoqing Hu,
  • Junfeng Guo,
  • Rongzhang Xi,
  • Penghui Chen

摘要

This study presents an integrated field-experimental and numerical investigation into the dynamic behavior of a large-span simply supported trough girder bridge under heavy-haul freight trains. Through on-site dynamic load testing and development of a vehicle-bridge coupled finite element model incorporating track irregularities, the bridge responses and train operational indices are quantified, and the impact of changes in cross-sectional height on structural dynamic behavior is further explored. Key findings revealed the following: Experimentally, under 80 km/h operation, the mid-span dynamic displacement reaches 2.56 mm, with longitudinal stresses of 0.76 and − 1.52 MPa. Maximum mid-span accelerations are 0.58 m/s² laterally and 1.26 m/s² vertically. Near-traveling side responses exceed those on far-travelling side, deck vertical accelerations surpass web upper-flange values, whereas lateral accelerations exhibit an opposite relationship. Simulations indicated that the mid-span bottom plate’s lateral dynamic response is significantly smaller than its vertical response under train passage. The maximum lateral and vertical dynamic displacements are 0.30 and 7.68 mm, with accelerations of 0.25 and 3.34 m/s², respectively. Train safety indices increase and then decrease with rising speed, and the number of trains significantly affects stability. Increasing the cross-sectional height substantially reduces mid-span bottom plate vertical displacement, vertical acceleration, and lateral acceleration but minimally affects lateral displacement. It also improves web bilateral resistance to vertical vibrations while intensifying its transverse vibrations.