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学者姓名：练强
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Abstract ：
Earthquake-induced debris flow landslides pose a serious threat to bridge structures. However, current research on the dynamic response and damage mechanisms of bridges due to debris flow landslides is still insufficient; the fragility analysis of bridges under the combined effects of earthquakes and related geological hazards needs further improvement. In this paper, a bridge dynamic response simulation method is proposed for the coupled effects of transverse earthquakes and debris flow landslides. The method first establishes an integrated model of the mountain and bridge piers, using the discrete element method to calculate the dynamic impact of the landslide on the piers. Subsequently, a nonlinear dynamic model of the bridge is established using the finite element method. By inputting the time histories of transverse seismic motion and landslide impact, the coupled effects of transverse earthquakes and landslides are analyzed. The paper analyzes the influence of sliding distance, landslide length, and slope gradient on the dynamic response and fragility of bridges through case studies. Research reveals that the shear capacity of the pier under the coupled effects of earthquakes and landslides should be considered. The combined effects also increase the displacement response of the piers, with the maximum pier top drift ratio of the case bridge increasing by 334 % at a 35 degrees slope compared to the earthquakeonly condition. Under the coupled effects of earthquakes and landslides, the piers will experience significant residual deformation in the direction of the landslide. Increases in sliding distance, landslide length, and slope gradient all increase the fragility of bridges under various damage states, with the complete damage probability of the case bridge rising from 5 % under earthquake-only conditions to 47 % at a 35 degrees slope. The slope gradient has the greatest sensitivity to the fragility of bridges, followed by the sliding distance, and finally the landslide length.
Keyword ：
Bridge damage mechanisms Bridge damage mechanisms Bridge fragility Bridge fragility Debris flow landslides Debris flow landslides Earthquake and landslide coupling Earthquake and landslide coupling Mountain bridges Mountain bridges
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| GB/T 7714 | Lian, Qiang , Chen, Libo , Dang, Xinzhi et al. Dynamic response and fragility of mountain bridges under the coupled effects of transverse earthquakes and landslides [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2025 , 188 . |
| MLA | Lian, Qiang et al. "Dynamic response and fragility of mountain bridges under the coupled effects of transverse earthquakes and landslides" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 188 (2025) . |
| APA | Lian, Qiang , Chen, Libo , Dang, Xinzhi , Zhuo, Weidong , Li, Changchun . Dynamic response and fragility of mountain bridges under the coupled effects of transverse earthquakes and landslides . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2025 , 188 . |
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Abstract ：
To assess the importance of bridges in road networks and achieve uniform traffic loss risk in seismic design, this paper introduces a novel bridge seismic design methodology incorporating the Seismic Importance Adjustment Factor (SIAF) and uniform traffic loss risk. The key technical contributions are as follows: (1) defining SIAF and developing an integrated framework that couples seismic design with traffic loss risk assessment; (2) proposing a calculation method for traffic loss risk that accounts for traffic demand variations during different periods of the day, uncertainties in post-earthquake bridge repair times, and dynamic traffic flow reassignment in post-earthquake road networks; (3) establishing design indicators for traffic loss risk and defining five seismic risk design levels based on historical disaster data; (4) validating the methodology through case studies on bridges and road networks, demonstrating how SIAF interconnects seismic design with risk-based design targets and adapt seismic design standards to varying network redundancies. The research demonstrates that SIAF can quantify bridge importance within complex road networks and provide a practical reference for the development of seismic design standards.
Keyword ：
Redundancy Redundancy Road network Road network Seismic design standard Seismic design standard Traffic loss risk Traffic loss risk Uniform seismic risk Uniform seismic risk
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| GB/T 7714 | Lian, Qiang , Zhuo, Weidong , Dang, Xinzhi et al. Bridge seismic design method incorporating seismic importance adjustment factor and uniform traffic loss risk [J]. | BULLETIN OF EARTHQUAKE ENGINEERING , 2025 , 23 (4) : 1797-1827 . |
| MLA | Lian, Qiang et al. "Bridge seismic design method incorporating seismic importance adjustment factor and uniform traffic loss risk" . | BULLETIN OF EARTHQUAKE ENGINEERING 23 . 4 (2025) : 1797-1827 . |
| APA | Lian, Qiang , Zhuo, Weidong , Dang, Xinzhi , Zhang, Qiwei . Bridge seismic design method incorporating seismic importance adjustment factor and uniform traffic loss risk . | BULLETIN OF EARTHQUAKE ENGINEERING , 2025 , 23 (4) , 1797-1827 . |
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