Dynamic responses and damage behavior of hollow RC piers against rockfall impact

Zhao, Wuchao; Feng, Huida; Ye, Jihong; Jia, Qingxuan

doi:10.1016/j.tws.2023.110771

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…where Hstand is the effective elevation of the landslide surface, and Hi is the elevation of th bridge pier bottom, χ is the effective width of the impact surface, taken as 0.85 for a circu lar cross-section. The impact energy of the debris particles under different pier arrangement scheme calculated according to Equation (12), is shown in Figure 16. From the analysis in Figur 16, it can be seen that the reduction in impact energy of the debris bodies was not signifi cant in the arrangements of y = 0 m, 3 m, and 6 m. However, when y = 9 m, the impac energy on the bridge pier was significantly reduced, indicating that under a smaller latera slope terrain on both sides, the sliding debris particles have a certain clustering effec which promotes the intensification of disaster damage in the central area of the V-shape valley.…”

Section: Impact Energy Analysismentioning

confidence: 99%

“…With a lateral offset y = 0 m or y = 3 m of the pier, the impact angl θ changed from 0° to 30°; the impact energy of the bridge pier did not change significantl with the increase of the impact angle, but when the impact angle θ was changed from 30 to 45°, the impact energy significantly increased. When the lateral offset of the #1 pie column was y = 6 m or y = 9 m, the change in impact energy was relatively small at a The impact energy of the debris particles under different pier arrangement schemes, calculated according to Equation (12), is shown in Figure 16. From the analysis in Figure 16, it can be seen that the reduction in impact energy of the debris bodies was not significant in the arrangements of y = 0 m, 3 m, and 6 m. However, when y = 9 m, the impact energy on the bridge pier was significantly reduced, indicating that under a smaller lateral slope terrain on both sides, the sliding debris particles have a certain clustering effect, which promotes the intensification of disaster damage in the central area of the V-shaped valley.…”

Section: Impact Energy Analysismentioning

confidence: 99%

“…In terms of model experiments, Luo et al [11] conducted impact tests on rectangular bridge piers to investigate the dynamic propagation of damage, impact forces, and dynamic displacement responses of piers under rolling stone impact. Zhao et al [12] studied the impact forces, lateral displacement, internal forces, and failure modes of hollow rectangular reinforced concrete piers under rockfall impact through indoor model tests and finite element numerical simulations. Chen et al [13] studied the factors influencing the maximum impact force of debris flows on bridge piers.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Impact Law of V-Shaped Gully Debris Avalanches on Double-Column Piers

Cheng,

Gao

2024

Buildings

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The concrete piers in steep mountain areas are highly susceptible to damage disasters due to the impact of debris avalanches, which pose a serious threat to the safe operation of bridge structures. In order to investigate the impact load characteristics of debris avalanches on bridge pier structures in V-shaped valley mountain areas, Particle Flow Code 3D (PFC3D) models based on a discrete element method were applied in this study to establish a full-scale three-dimensional model of a debris avalanche in a V-shaped valley. By installing double-column piers in the influence zone of the debris avalanche, the impact force, accumulation morphology, motion characteristics of debris particles, internal force response of the double-column piers, and impact energy indicators were investigated. In addition, parameters such as the layout position of the piers and the impact angle of the debris were studied. The results showed that the particles at the front edge of the debris avalanche have a significant impact on the magnitude and distribution of the impact force on the piers. It is important to consider the layout position of the piers and the impact angle of the debris when designing bridge pier structures in high, steep mountain areas. There was a significant difference in the movement patterns between the particles at the front and rear edges of the landslide. The particles at the front edge had a higher velocity and stronger impact, while the particles at the rear edge had a slower velocity and were more likely to be obstructed by bridge piers, leading to accumulation. The obstruction effect of the piers on the debris particles was closely related to their positioning and the impact angle. Piers that were closer to the center of the valley and had a larger impact angle have a more significant obstruction effect, and the topography of the valley had a significant focusing effect on the debris avalanche, resulting in a greater impact force and energy on the piers located closer to the center of the valley. The impact force amplitude and duration of landslide debris on bridge piers showed a significant difference between the bottom and upper piers, as well as between the piers on the upstream and downstream sides. These research findings can provide valuable references for the design and disaster assessment of bridge piers for impact prevention in steep slopes and mountainous areas with deep ravines.

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Section: Impact Energy Analysismentioning

confidence: 99%

Section: Impact Energy Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Impact Law of V-Shaped Gully Debris Avalanches on Double-Column Piers

Cheng,

Gao

2024

Buildings

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“…They established the relationship between maximum impact force and impact distance, as well as debris flow volume. Zhao et al [15] conducted impact tests on reinforced concrete hollow piers to study the impact force, internal forces, and failure modes. They analyzed the effects of parameters including rock diameter, impact velocity, and pier reinforcement ratio on the dynamic response and damage modes of the piers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Dynamic Response of Concrete Bridge Piers under the Impact of Rock Debris Flow

Cheng

2024

Buildings

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The impact and damage caused by debris flow on concrete bridges have become a typical disaster scenario. However, the impact disaster mechanism of debris flow on bridge structures remains unclear. This study focused on investigating the impact mechanism of debris avalanches on concrete bridge piers. By employing the discrete element numerical simulation method to examine the effect of debris on concrete bridge piers, the analysis explored the influence of three significant factors: the pier’s section shape, the impact distance, and the slope angle of the sliding chute. The discussions included the accumulation pattern of rock debris, the impact force on the pier, and the shear force and bending moment at the pier’s bottom, as well as the displacement and velocity response laws at the pier’s top. The results demonstrate that rectangularly shaped piers have a high efficiency in obstructing debris, leading to higher impact forces and internal forces on piers. Arched-shaped piers exhibit a short-duration, high-peak instantaneous impact from debris. Increasing the impact distance of the piers can significantly reduce the impact force of debris. The accumulation height of debris, pier impact force, and the pier’s bottom internal forces decrease and then increase with the increase in slope angles, with a 45° slope angle being the critical point for the transition of debris impact on piers. The results can provide references for the disaster prevention design of concrete bridge structures in hazardous mountainous areas.

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Hybrid RNN and metaheuristic approach for modeling and optimization of seismic behavior in thin-walled rectangular hollow bridge piers

Alkhawaldeh

2023

Asian J Civ Eng

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Dynamic responses and damage behavior of hollow RC piers against rockfall impact

Cited by 12 publications

References 41 publications

Study on the Impact Law of V-Shaped Gully Debris Avalanches on Double-Column Piers

Study on the Impact Law of V-Shaped Gully Debris Avalanches on Double-Column Piers

Numerical Analysis of the Dynamic Response of Concrete Bridge Piers under the Impact of Rock Debris Flow

Hybrid RNN and metaheuristic approach for modeling and optimization of seismic behavior in thin-walled rectangular hollow bridge piers

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