Soil Dynamics and Earthquake Engineering最新文献_第6页

The shear characterization of hydrate-bearing clayey-silty sediments with layered hydrate distributions: Insights from different hydrate saturations and effective confining pressures

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.soildyn.2025.109289

Songkui Sang , Liang Kong , Zhaoyuan Zeng , Yapeng Zhao , Jiaqi Liu , Yifan Zhu , Shijun Zhao

The mechanical behavior of hydrate-bearing sediments (HBS) is influenced by the layered hydrate distribution, and comprehensively understanding the mechanical properties of layered HBS is a precondition for achieving safe and efficient hydrate exploration. In this paper, a series of consolidation-drained triaxial tests of layered hydrate-bearing clayey-silty sediments (LHBCSS) were carried out with the clayey-silty reservoir in the South China Sea as the investigation background. The evolution rules of cohesion c and internal friction angle φ of LHBCSS under different impact factors were investigated. The shear dilatation characteristics of LHBCSS were clarified. The shear mechanism of the LHBCSS was revealed. The results show that the strain hardening dominates the stress-strain curves of LHBCSS, and the effective confining pressure σ′ promotes the strain hardening. The failure strength σ_f and stiffness increased with the increment of the upper layer saturation. The c rises exponentially with the upper layer saturation, while the impact of upper layer saturation on the φ is insignificant. With the increase of σ′, the LHBCSS transforms from shear dilatation to shear contraction. The shear dilatation characteristics of the LHBCSS are influenced by the coupled impacts from multiple influencing factors.

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引用次数: 0

Hybrid empirical ground-motion model for the Alborz region of northern Iran

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.soildyn.2025.109292

Mehran Davatgari-Tafreshi, Shahram Pezeshk

The Alborz region is situated in northern Iran and is a seismically active region that has experienced several devastating earthquakes. Due to the scarcity of recorded data, only a few Ground Motion Models (GMMs) have been developed explicitly for the Alborz region, and most of the previous GMMs for Iran have been developed for the entire country by combining data from all five seismotectonic provinces. The capabilities of the Hybrid Empirical Method (HEM) in developing GMMs for regions with sparse recorded datasets enable us to develop a new GMM for the Alborz region. In this study, using the HEM approach, we developed a new GMM to predict Peak Ground Acceleration (PGA) and spectral accelerations (SAs) across periods ranging from 0.01 to 10 s in the Alborz region of northern Iran. The dataset comprises 775 acceleration records generated by 167 events, recorded at 309 stations within the range of 1 km < R_jb < 160 km and 3 < M_w < 7.4, from 1980 to 2020. We adopted a simple functional form that is a function of moment magnitudes (M_w) and Joyner-Boore distance (R_jb) for the reference site condition with V_S30 = 760 m/s. This model is applicable for M_w in the range of 3–7.5, R_jb ≤ 200 km, and the reference site condition with V_S30 = 760 m/s.

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引用次数: 0

Seismic fragility assessment of non-invasive geotechnical seismic isolation for existing bridges

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-08 DOI: 10.1016/j.soildyn.2025.109266

Ziqiang Ma, Yurun Li, Dongsheng Wang

Geotechnical seismic isolation (GSI) is a new concept that has been proposed recently. The injection of polyurethane into the soil layer (non-intrusive GSI) reduces seismic fragility without altering the original structure, which may provide an effective seismic isolation solution for existing bridge structures. The purpose of this study was to investigate the seismic isolation effect and isolation mechanism of non-invasive GSI applied to existing bridges. First, a noninvasive GSI site modeling method is described based on the results of existing soil-polyurethane resonance column tests and the OpenSees computational platform. Subsequently, a refined dynamic analysis model of site-existing bridge interactions was established by combining the rusting theory. The seismic isolation effect of the non-invasive GSI and its effect on the seismic response of the bridge were explored using a nonlinear dynamic time-course analysis. The results showed that non-invasive GSI soils can change the characteristic period of ground motion, thus reducing the site effect. The seismic isolation effect was positively correlated with the percentage of injected polyurethane. Altering the characteristic period of the site and avoiding as many of the preeminent periods of ground motion as possible is the result of noninvasive GSI. The non-invasive GSI soil layer reduces the structural response and provides seismic isolation throughout the life cycle of corroded piers, and its fragility is significantly reduced. Especially, the “old” piers have significant seismic isolation effect, effectively limiting serious damage or even collapse under earthquakes. The results of this study provide a reference for noninvasive GSI design of existing bridge structures.

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引用次数: 0

Effect of water table on the behaviour of retaining walls and adjacent structures during earthquake loading

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-07 DOI: 10.1016/j.soildyn.2025.109273

Xiaoyu Guan, Gopal Santana Phani Madabhushi

In the context of container ports, the water table is typically lower than the ground surface of the backfill, allowing container cranes to load or unload freight from ships. Although previous studies of the seismic behaviour of retaining walls embedded in saturated soils have been performed, the same water table and ground surface are adopted for simplicity. Moreover, limited research has been conducted considering the influence of existing structures, i.e. container cranes in a more specific sense, on retaining wall systems subjected to seismic loading. In this research, a series of dynamic centrifuge tests were performed on the same retaining wall system with the same structure on the backfill, but with different water tables to investigate the effect of water tables on the dynamic behaviour of retaining walls and adjacent container cranes. This paper presents the dynamic response of soil and retaining walls in terms of accelerations, displacements, and deformations. The behaviour of the structure on the backfill is also presented. Very interestingly, it is found that the lowered water table caused changes in the failure mechanism of this retaining wall system.

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引用次数: 0

Sobol’ sensitivity analysis of a 1D stochastic elasto-plastic seismic wave propagation

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-07 DOI: 10.1016/j.soildyn.2025.109283

Hexiang Wang , Fangbo Wang , Han Yang , Katarzyna Staszewska , Boris Jeremić

A novel numerical framework for the Sobol’ sensitivity analysis of 1D stochastic elasto-plastic wave propagation is proposed and evaluated. The forward propagation of uncertain input motions through uncertain elasto-plastic soils and structures is often conducted using the finite element method (FEM) together with the Monte Carlo simulation. However, it is computationally much more efficient to use the stochastic elasto-plastic FEM (SEPFEM) instead. Hence the developed framework is based on the SEPFEM. The backward propagation of uncertainties, that is, the determination of relative influences of individual uncertain input motions and uncertain material properties on the resulting uncertain seismic wave propagation, is known as the global sensitivity analysis. A global sensitivity analysis, namely, the Sobol’ sensitivity analysis, is included in the proposed framework. Uncertain input, bedrock motions are obtained using the ground motion prediction equations of Fourier amplitude spectra and Fourier phase derivative, and they are modeled as a non-stationary random process. Stochastic elasto-plastic soil properties are represented as heterogeneous random fields. The random process and the random fields are discretized in the probabilistic space using an orthogonal Hermite polynomial chaos (PC) basis. The probabilistic system response is obtained efficiently using the Galerkin stochastic FEM. The Sobol’ sensitivity analysis is conducted for the PC-represented uncertain system response. The benefits of the presented framework to the site-specific probabilistic seismic hazard analysis are discussed.

The novel approach enables to take into account the uncertainty in both, seismic load and elasto-plastic material parameters, and to assess their individual influences on the overall uncertainty in the resulting wave field accurately and efficiently. The presented framework has been implemented into Real-ESSI Simulator and, here, it is evaluated and demonstrated to be very useful for the seismic site response analysis.

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引用次数: 0

A new collapse mechanism of RC frame structures under earthquakes: Shaking table tests and numerical analysis

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-07 DOI: 10.1016/j.soildyn.2025.109281

Zhe Xu , Zi-Han Chen , Feng Lin

For the reinforced concrete (RC) frame structures under mega earthquakes, it is well acknowledged that damage primarily concentrates at beam ends and column ends. Successively, a certain number of plastic hinges develop which can trigger the structural collapse. However, the present study found that the plastic hinges could form at the mid-span of the first story beams in an RC frame structure configured with a slab opening on one side of the first floor. To investigate the failure behavior and collapse mechanism, first, shaking table tests were conducted on three 1/10-scale three-story RC frame models M1, M2 and M3, each configured with a slab opening on one side of the first floor. The models M1 and M2 were identical and conducted for repetition, while the model M3 served as a reference and was strengthened at the mid-span of the first story beams to prevent from forming a plastic hinge at this location. Then, the time history analysis and pushover analysis were performed using the finite element method. Finally, the prototype RC frame structures were numerically simulated till collapse under five bidirectional earthquakes. Test and numerical results found that for the models M1 and M2, the plastic hinges consistently formed at the mid-span of the first story beams and contributed to the new collapse mode towards the side with the slab opening. However, for the model M3, the plastic hinges concentrated at the beam ends and columns ends, behaving in the commonly recognized collapse towards the side without the slab opening. The pushover analysis found that the slab on one side of the first floor significantly influenced the distribution of cross-sectional bending moments along the first story beams, leading to the plastic hinges developing at the mid-span of the first story beams.

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引用次数: 0

Study on the resonance response of soil–pile-nuclear island structural system under seismic excitation

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-06 DOI: 10.1016/j.soildyn.2025.109256

Xiankai Zhang , Wenhao Qi , Feng Xia , Changyuan Liu , Xu Han

Resonance can significantly amplify a structure’s response to seismic loads, leading to extended damage, especially in critical infrastructure like nuclear power plants. Thus, this study focuses on the resonance effects of the dynamic interaction between layered soil, pile foundations, and nuclear island structures, which is particularly important given the limited availability of bedrock sites for such facilities. Specifically, this study explores the resonance behavior of nuclear islands under various seismic conditions through large-scale shaking table tests by developing a dynamic interaction model for layered soil–pile-nuclear island systems. The proposed model comprises a 3 × 3 pile group supporting the upper structure of a nuclear island embedded within a three-layer soil profile. Sinusoidal waves of varying frequencies identify the factors influencing the system’s resonance response. Besides, the resonance effects are validated by inputting seismic motions based on compressed acceleration time histories. Furthermore, the impact of non-primary frequency components on structural resonance is assessed by comparing sinusoidal wave components. The findings reveal that resonance effects increase as the amplitude of the input seismic motion increases to a certain threshold, after which the effect stabilizes. This trend is particularly pronounced in the bending moment response at the pile head. Additionally, an independent resonance phenomenon is observed in the superstructure, suggesting that its resonance effects should be considered separately in nuclear island design. Similar resonance effects are observed when the predominant frequency of sinusoidal waves closely matches the compressed seismic motions, suggesting that sinusoidal inputs effectively simulate structural resonance during seismic design testing.

{"title":"Study on the resonance response of soil–pile-nuclear island structural system under seismic excitation","authors":"Xiankai Zhang , Wenhao Qi , Feng Xia , Changyuan Liu , Xu Han","doi":"10.1016/j.soildyn.2025.109256","DOIUrl":"10.1016/j.soildyn.2025.109256","url":null,"abstract":"<div><div>Resonance can significantly amplify a structure’s response to seismic loads, leading to extended damage, especially in critical infrastructure like nuclear power plants. Thus, this study focuses on the resonance effects of the dynamic interaction between layered soil, pile foundations, and nuclear island structures, which is particularly important given the limited availability of bedrock sites for such facilities. Specifically, this study explores the resonance behavior of nuclear islands under various seismic conditions through large-scale shaking table tests by developing a dynamic interaction model for layered soil–pile-nuclear island systems. The proposed model comprises a 3 × 3 pile group supporting the upper structure of a nuclear island embedded within a three-layer soil profile. Sinusoidal waves of varying frequencies identify the factors influencing the system’s resonance response. Besides, the resonance effects are validated by inputting seismic motions based on compressed acceleration time histories. Furthermore, the impact of non-primary frequency components on structural resonance is assessed by comparing sinusoidal wave components. The findings reveal that resonance effects increase as the amplitude of the input seismic motion increases to a certain threshold, after which the effect stabilizes. This trend is particularly pronounced in the bending moment response at the pile head. Additionally, an independent resonance phenomenon is observed in the superstructure, suggesting that its resonance effects should be considered separately in nuclear island design. Similar resonance effects are observed when the predominant frequency of sinusoidal waves closely matches the compressed seismic motions, suggesting that sinusoidal inputs effectively simulate structural resonance during seismic design testing.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"191 ","pages":"Article 109256"},"PeriodicalIF":4.2,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143260641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of landslides induced by earthquake risk of Istanbul: A comprehensive study utilizing an integrated DFS-AHP and DFS-EDAS approach

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-05 DOI: 10.1016/j.soildyn.2025.109285

Bahar Yalcin Kavus , Alev Taskin

Secondary disasters, the grim aftermath of earthquakes, encompass a range of life-threatening risks, including aftershocks, building collapses, landslides, tsunamis, fires, and water pollution. These disasters, far from being mere inconveniences, can cause significant damage and loss of life. The gravity of secondary disasters, particularly in high-risk areas like Istanbul, underscores the need for comprehensive study and preparation. This study specifically addresses the risk of post-earthquake landslides in Istanbul and emphasizes the importance of proactive preparation to mitigate the consequences of these hazards. It explicitly examines the European side of Istanbul and aims to rank the districts according to their post-earthquake landslide risk. The criteria for weighting are determined based on a comprehensive review of the literature on landslide risks triggered by earthquakes. The Decomposed Fuzzy Analytic Hierarchy Process (DFS-AHP) is used to determine the importance of each criterion, and the Decomposed Fuzzy Evaluation based on the Distance from Average Solution (DFS-EDAS) method ranks the alternatives. This study introduces a new approach that contributes methodologically and practically to the limited literature on secondary disasters. In particular, this study presents the first application of AHP and EDAS models integrated with DFS. This approach advances the literature and offers a replicable framework that can be adapted for similar risk assessments in other regions worldwide. By identifying high-risk zones and prioritizing areas for emergency response, this methodology provides a practical tool that can support disaster preparedness and response strategies globally. The study also aims to support municipal authorities in formulating effective preparedness and risk mitigation strategies appropriate to Istanbul's unique geological and urban structure.

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引用次数: 0

Cyclic test and numerical analysis of an innovative re-centering SMA cable-wrapped wedge friction damper

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-05 DOI: 10.1016/j.soildyn.2025.109268

Chenliang Fan , Hui Qian , Yifei Shi , Linsheng Huo

In order to address the problems associated with conventional friction dampers, including excessive residual displacements, limited initial stiffness and unstable energy dissipation, a novel solution is introduced in this study: the SMA cable-based recentering wedge friction damper (RWFD). This innovative system integrates a re-centering mechanism controlled by SMA cables and a friction damper design designed to achieve re-centering functionality and stable energy consumption. This study details the complex construction and assembly of the re-centering SMA cable wedge friction damper and explains its principle of operation.In this study, loading tests have been performed on SMA cables and the results are given with conclusions and recommendations. In addition, this study also produces a real component equal to the RWFD 3D model for loading test, the loading phenomenon and results are analyzed, which provides important information for the subsequent simulation analysis.The finite element refinement model of RWFD, which is consistent with the theoretical model and experimental results, is established and rigorously verified, and the key parameters affecting the performance of RWFD are comprehensively analyzed: longitudinal thickness of SMA cable, initial pre-tensioning stress, transversal width of SMA cable, and friction surface coefficient. The load-displacement curves of the corresponding models were derived from the finite element model simulations and evaluated using the relevant performance indicators. The evaluation results not only validate the effectiveness of RWFD, but also provide valuable insights for optimising its performance.

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引用次数: 0

Hysteretic and seismic behavior of thick rubber bearings under bidirectional shear loading

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering

Pub Date : 2025-02-05 DOI: 10.1016/j.soildyn.2025.109279

Mohammed Samier Sebaq , Ying Zhou , Zengde Zhang

The behavior of thick rubber bearings (TRBs) is complex because of their thick rubber layers, which are specifically designed to reduce vertical and horizontal vibrations. Although extensive literature supports the benefits of TRBs, there is a lack of research examining the performance of TRBs subjected to the bidirectional shear deformation. Therefore, this study numerically investigates the hysteretic behavior of four full-scale TRBs under bidirectional shear loading, including box, circle, and figure-eight orbits. First, numerical models were developed in ABAQUS software and validated against experimental results by comparing hysteretic curves of TRBs under unidirectional loading, along with data from a single square TRB under bidirectional loading available in the literature. Then, this study examined the effects of bidirectional loading on the effective stiffness and damping ratio of bearings, the shear stress distribution and strain energy of the rubber layers, as well as the Mises stress distribution of the steel shims. The numerical results showed that bidirectional loading altered the shape of the hysteretic curves, particularly under the figure‐eight orbit loading. Bidirectional loading reduced effective stiffness, and increased shear stress at varying shear strains and Mises stress along the steel shims. Finally, the behavior of 10-story building with TRBs under coupled ground motions was investigated. It indicated that bidirectional ground motions significantly increased the horizontal acceleration and deformation of TRBs, as well as their vertical deformation. This led to higher shear stress, strain energy in the rubber layers, and Mises stress in the steel shims compared to unidirectional motion.

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引用次数: 0