Influence of pore pressure on natural frequency wandering of structures under earthquake conditions

Kowalczyk, Piotr; Gajo, Alessandro

doi:10.1016/j.soildyn.2020.106534

Cited by 3 publications

(3 citation statements)

References 31 publications

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Section: Verification Of the Resultsmentioning

confidence: 88%

“…With the increase in seawater depth, the maximum principal stresses of the tunnel bottom and top plates show an increasing trend of decreasing growth rate. This indicates that the seawater depth has a suppression effect on the vertical frequency of the tunnel [53]. With the increase in the replacement rate of the piled foundation, the stress peaks of the top and bottom plates are shifted toward the wave source direction, and the shift angle in the middle is about twice the shift angle of the left and right sides (θ1 = 2θ2), as shown in Figure 8a.…”

Section: Parametric Analysismentioning

confidence: 88%

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Deformation and Stress Analysis of Pile-Supported Immersed Tunnels under Seismic Loads

Zhuang,

Fan,

et al. 2023

Applied Sciences

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The stress and deformation of pile-supported immersed tunnels under seismic loads is a critical issue in tunnel design. This paper utilizes ABAQUS (version 2020) finite element software to analyze the seismic load response of the sand compaction pile-immersed tunnel–seawater pressure (SIS) system, which is verified by a physical model. The study shows that the suppression effect of the seawater on the vertical frequency of the tunnel increases with depth. When the replacement rate of the piled foundation reaches 50%, the deformation of the tunnel “H-shaped” structures increases, which also changes the vertical frequency of the tunnel. However, the presence of the suppression effect causes resonance injury at the far end of the tunnel from the earthquake source, resulting in a shift of the peak stress point. It was also found that seawater pressure affects the resistance–deflection (p-y) at the tip of the pile more than at the end of the pile. The slenderness ratio (γ) of the pile affects the p-y value at the end of the pile more than at the tip of the pile. The connection between the piled foundation and the tunnel is most stable when γ is in the range of 9.25 to 15.

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Section: Verification Of the Resultsmentioning

confidence: 88%

Section: Parametric Analysismentioning

confidence: 88%

Deformation and Stress Analysis of Pile-Supported Immersed Tunnels under Seismic Loads

Zhuang,

Fan,

et al. 2023

Applied Sciences

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“…The model has been proven to be effective in predicting sand behaviour for a wide range of boundary value problems (e.g. [1,37,51]). The constitutive parameters are carefully calibrated on the basis of element tests of Perth sand samples.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of the effects of foundation scour on the response of a bridge pier

et al. 2022

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Foundation scour can have a detrimental effect on the performance of bridge piers, inducing a significant reduction of the lateral capacity of the footing and accumulation of permanent settlement and rotation. Although the hydraulic processes responsible for foundation scour are nowadays well known, predicting their mechanical consequences is still challenging. Indeed, its impact on the failure mechanisms developing around the foundation has not been fully investigated. In this paper, numerical simulations are performed to study the vertical and lateral response of a scoured bridge pier founded on a cylindrical caisson foundation embedded in a layer of dense sand. The sand stress–strain behaviour is reproduced by employing the Severn-Trent model. The constitutive model is firstly calibrated on a set of soil element tests, including drained and undrained monotonic triaxial tests and resonant column tests. The calibration procedure is implemented considering the stress and strain nonuniformities within the samples, by simulating the laboratory tests as boundary value problems. The numerical model is then validated against the results of centrifuge tests. The results of the simulations are in good agreement with the experimental results in terms of foundation capacity and settlement accumulation. Moreover, the model can predict the effects of local and general scour. The numerical analyses also highlight the impact of scouring on the failure mechanisms, revealing that the soil resistance depends on the hydraulic scenario.

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Structural Response to High Frequency Motion Released in Nonlinear Soil

Kowalczyk

2022

Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 202

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Influence of pore pressure on natural frequency wandering of structures under earthquake conditions

Cited by 3 publications

References 31 publications

Deformation and Stress Analysis of Pile-Supported Immersed Tunnels under Seismic Loads

Deformation and Stress Analysis of Pile-Supported Immersed Tunnels under Seismic Loads

Numerical modelling of the effects of foundation scour on the response of a bridge pier

Structural Response to High Frequency Motion Released in Nonlinear Soil

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