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<p>This study investigates the seismic performance of tunnel-type anchorage (TTA) by installing a damping layer between the anchorage body and the surrounding rock. Based on wave propagation theory, the calculating formula for the dynamic response of the anchorage system under seismic excitation is derived. A series of numerical simulations are conducted to systematically evaluate the influence of key parameters on the damping effectiveness, including (i) the type of damping layer material, (ii) the seismic wave dominant frequency, (iii) the thickness of the damping layer, and (iv) coupling effect of damping layer thickness and seismic wave dominant frequency. To quantitatively evaluate seismic mitigation, a performance metric called the “damping efficiency ratio” is introduced. The results indicate that sponge rubber, due to its higher stiffness, generally exhibits superior damping performance compared to foamed concrete. The optimal damping layer thickness is 35&#xa0;cm. Increasing it to 40&#xa0;cm leads to localized stress resurgence due to insufficient stiffness. Coupled analysis reveals that the seismic wave dominant frequency and the damping layer thickness are the primary factors governing the structural dynamic response. Moreover, the damping layer does not reduce the TTA's static load-bearing capacity.</p>

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Study on Damping Layer and Its Damping Efficiency of Tunnel-Type Anchorage in Suspension Bridges Under Seismic Loading

  • 期刊论文

  • 发表日期：

    2025年8月6日

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

摘要

This study investigates the seismic performance of tunnel-type anchorage (TTA) by installing a damping layer between the anchorage body and the surrounding rock. Based on wave propagation theory, the calculating formula for the dynamic response of the anchorage system under seismic excitation is derived. A series of numerical simulations are conducted to systematically evaluate the influence of key parameters on the damping effectiveness, including (i) the type of damping layer material, (ii) the seismic wave dominant frequency, (iii) the thickness of the damping layer, and (iv) coupling effect of damping layer thickness and seismic wave dominant frequency. To quantitatively evaluate seismic mitigation, a performance metric called the “damping efficiency ratio” is introduced. The results indicate that sponge rubber, due to its higher stiffness, generally exhibits superior damping performance compared to foamed concrete. The optimal damping layer thickness is 35 cm. Increasing it to 40 cm leads to localized stress resurgence due to insufficient stiffness. Coupled analysis reveals that the seismic wave dominant frequency and the damping layer thickness are the primary factors governing the structural dynamic response. Moreover, the damping layer does not reduce the TTA's static load-bearing capacity.