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<p>This study proposes a novel grid-type tunnel anchorage (GTA) for suspension bridges, featuring the gridded holes layout on the surface of the anchorage body that differs fundamentally from conventional tunnel-type anchorages (TTA) in load transfer and structural interaction. Combining elastic wave theory with FLAC3D numerical simulations, the seismic response of the GTA under varying seismic wave incidence angles was obtained. Under the modeling conditions of this study, relative to the TTA, the GTA reduced concrete volume by 23% and increased the anchorage body–surrounding rock contact area by 137%, enhancing both material efficiency and interface engagement. Simulations show that the GTA lowers displacement, stress, and transmitted seismic energy, while achieving a more uniform strain distribution. These results demonstrate the GTA’s potential to improve seismic resilience and provide a lightweight, efficient design strategy for large-span bridge anchorage systems.</p>

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Seismic Response of Grid-Type Tunnel Anchorage Under Varying Wave Incidence Angles

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Guojun Yang,
  • Zhiwei Hou,
  • Yongfeng Du,
  • Ke Xu,
  • Zongjian Han

摘要

This study proposes a novel grid-type tunnel anchorage (GTA) for suspension bridges, featuring the gridded holes layout on the surface of the anchorage body that differs fundamentally from conventional tunnel-type anchorages (TTA) in load transfer and structural interaction. Combining elastic wave theory with FLAC3D numerical simulations, the seismic response of the GTA under varying seismic wave incidence angles was obtained. Under the modeling conditions of this study, relative to the TTA, the GTA reduced concrete volume by 23% and increased the anchorage body–surrounding rock contact area by 137%, enhancing both material efficiency and interface engagement. Simulations show that the GTA lowers displacement, stress, and transmitted seismic energy, while achieving a more uniform strain distribution. These results demonstrate the GTA’s potential to improve seismic resilience and provide a lightweight, efficient design strategy for large-span bridge anchorage systems.