Article
Engineering, Civil
Yan Xu, Chuan Tong, Jianzhong Li
Summary: A simplified model and analytical formulas were proposed to determine the damping coefficient of nonlinear viscous dampers of cable-stayed bridges, under near-fault ground motions. The accuracy of the method was verified through numerical analysis of a real cable-stayed bridge model.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
Zhiwang Chang, Haoran Wu, Katsuichiro Goda
Summary: Proper parameterization of near-fault ground motions is crucial in earthquake engineering. This study proposes a progressive iterative approach for the automated parameterization of velocity pulses in near-fault motions. The approach matches a pulse model to the smoothed motion and derives the parameterized pulse by best fitting in both the time and spectral domains. The method avoids convergence to local minimums and achieves a good match between the extracted pulse and the original motion.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Construction & Building Technology
Necmettin Gunes
Summary: This study examines the effects of near-fault pulse-like ground motions on seismically isolated buildings and finds that the pulse period significantly affects isolator displacements, superstructure drift ratios, and superstructure load distributions.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Geological
Jinjun Hu, Longbing Ding, Xutong Zhou, Mingji Liu, Jingyang Tan
Summary: Offshore near-fault ground motions during the 2016 OffMie Mw6.0 earthquake in the Nankai Trough of Japan were studied using data from the DONET1 seafloor seismic network. The results show that offshore spectral acceleration and peak ground velocity are higher than onshore values. Analysis of pulse-like ground motions reveals differences in amplitude, frequency content, and energy between offshore and onshore motions. These findings have implications for seismic design of offshore engineering structures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Civil
Lu-Xi Li, Chao Li, Hong Hao
Summary: This study provides a comprehensive assessment on the seismic performance of post-tensioned self-centering (PTSC) frames under near-fault pulse-like ground motions (NPGMs). The effects of pulse period and energy dissipation on the PTSC frames are analyzed, and recommendations for the design of PTSC frames are provided based on the results.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Wenzhi Zheng, Ping Tan, Jian Li, Hao Wang, Yanhui Liu, Zhibin Xian
Summary: A novel superelastic conical friction pendulum isolator (SCFPI) is developed by combining an improved conical friction pendulum isolator (CFPI) with shape memory alloy (SMA) to improve the seismic performance of bridges. The SCFPI system is designed with a flat sliding function to enhance adaptability under service loadings. The study proposes a cost-effective design method and conducts case studies to demonstrate the effectiveness of the SCFPI system and design method under near-fault ground motions.
STRUCTURAL CONTROL & HEALTH MONITORING
(2023)
Article
Construction & Building Technology
Xiangxiu Li, Ping Tan, Aiwen Liu, Xiaojun Li
Summary: This study investigates the failure mechanism of the mega-sub isolation system under near-fault ground motions, revealing that the correlations of intensity indices and structural responses vary, with acceleration-related indices showing the worst correlations and displacement-related indices displaying high linearity. The sensitivity of structural responses to different parameters is also analyzed, indicating that the failure probability of the sub-structure is higher than that of the mega-structure under near-fault ground motion. Additionally, in the collapse state, the failure probability of the isolation layer exceeds that of the sub-structure.
ADVANCES IN STRUCTURAL ENGINEERING
(2021)
Article
Engineering, Geological
Hongjuan Chen, M. Hesham El Naggar, Jian Chu, Xiaojun Li, Qiumei He, Lihui Wang, Xianwei Liu, Longyun Zhou
Summary: This paper presents shaking tests conducted on a 1/30-scale utility tunnel model using a multi-shaking table array system. The model utility tunnel-soil system was subjected to input motions simulating near-fault ground motions with and without velocity pulse. The test data, including acceleration, strain, and displacement of the soil bed and model tunnel responses, were collected and analyzed. The soil data analysis indicated that the boundary effect of the model soil box used in the test was negligible. The observed small soil settlements confirmed that the physical and mechanical properties of the model soil did not change significantly during the tests. The results also showed that the transverse dynamic responses of the utility tunnel and surrounding soil under near-fault ground motion with velocity pulse were much greater than those without velocity pulse. Therefore, the effect of velocity pulse should be considered in the design of utility tunnels.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
X. T. Ma, C. Bao, S. Doh, H. Lu, L. X. Zhang, Z. W. Ma, Y. T. He
Summary: This study analyzed and compared the dynamic response characteristics of a base-isolated structure, a story-adding isolated structure, and a story adding seismic structure under different ground motion conditions using numerical simulation. The results showed that base isolation can effectively extend the period of the main structure, reduce the seismic response on the upper structure, and demonstrate excellent damping performance.
PHYSICS AND CHEMISTRY OF THE EARTH
(2021)
Article
Geosciences, Multidisciplinary
X. T. Ma, C. Bao, S. Doh, H. Lu, L. X. Zhang, Z. W. Ma, Y. T. He
Summary: This study investigated the dynamic response characteristics of base-isolated structures and story-adding isolated structures under different seismic scenarios. The results showed that base isolation can significantly extend the period of the structure and reduce seismic response, and both types of isolated structures demonstrated good damping performance.
PHYSICS AND CHEMISTRY OF THE EARTH
(2021)
Article
Engineering, Geological
Jun Feng, Boming Zhao, Tianci Zhao
Summary: The approach detects near-fault pulse-like ground motion using the VMD technique, decomposing the original ground motion into IMFs and obtaining a low-frequency signal. The classification standard for pulse-like ground motions is calibrated using 596 records based on energy indicator, with a further identification of significant velocity pulse at the beginning possibly caused by forward-directivity effects.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
Satish Bhagat, Anil C. Wijeyewickrema, Naresh Subedi
Summary: The study found that base-isolated buildings experience larger inter-story drift ratios and floor accelerations under near-fault ground motions with fling-step and forward-directivity characteristics. Removing the dominant pulse from the ground motions resulted in different outcomes. Additional analysis using artificial pulses showed that responses were larger for fling-step pulses compared to forward-directivity pulses.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Yu Li, Chen Li, Guo-Hui Zhao
Summary: By converting the seismic isolated simply-supported beam bridge into an equivalent bilinear single-degree-of-freedom system and inputting near-fault ground motion records, a parametric study on the near-fault seismic input energy spectra was conducted. It was found that parameters like post-yield stiffness ratio and damping ratio have an impact on the near-fault seismic input energy spectra. Additionally, factors such as site soil conditions and distance to rupture plane also play a role in determining the seismic input energy spectra.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Construction & Building Technology
Amirhossein Emamikoupaei, Ali Bigdeli, Konstantinos Daniel Tsavdaridis
Summary: In recent earthquakes, structures near seismic sources have suffered severe damage due to near-fault ground motions. This study aims to assess the structural effects of mid-rise steel Modular Building Systems (MBSs) under near-fault pulse-like and non-pulse-like records. The results show that near-field pulse-type ground motions generate larger demands on the MBS compared to non-pulse ground motions.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2023)
Article
Engineering, Mechanical
Peidong Guo, Han Zhao, Ping Xiang, Xiang Liu, Jincheng Tan, Lizhong Jiang
Summary: This paper presents an efficient and feasible approach for analyzing the train-bridge coupling system under random near-fault earthquakes. The validity of the method has been demonstrated through Monte Carlo simulations, and the sensitivity of the response to seismic randomness has been discussed.
PROBABILISTIC ENGINEERING MECHANICS
(2023)
Review
Engineering, Civil
Yu Huang, Bei Zhang
Summary: Flow-structure interaction is crucial for preventing geo-disasters, and physical modeling is challenging due to complex rheology, transient nature, and nonlinear response. Hierarchical scaling and coupled modeling are recommended to address key issues, while investigating the impact of Coriolis effect. Robust numerical tools are also recommended for experiment design and mechanism exploration.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Yu Huang, Bei Zhang
Summary: Debris-flow disaster has caused significant casualties and economic losses. The design strategy for disaster prevention should focus on improving impact force estimation, run-up height prediction, failure analysis, and plain configuration planning. Current methods mostly rely on hydraulic theory, lacking consideration for physical mechanisms, such as nonstationary flow regimes, impact patterns, and barrier characteristics. Physically based design strategies and robust physical modeling methods and numerical simulation tools are needed to understand flow-structure interaction mechanisms and verify structure design strategies. Additionally, the resilience-based disaster prevention concept should be emphasized for effective preparedness, response, and recovery.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Chunxiang Li, Kexing Luo, Liyuan Cao
Summary: This paper proposes a data-driven simulation methodology for multivariate nonstationary wind velocity based on S-transform, with the explicit introduction of time-varying coherence functions. The proposed method is validated through simulations and further improved using inverse S transform-based regulation and control method. The results demonstrate the feasibility and accuracy of the proposed approach in simulating nonstationary wind velocity.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Environmental Sciences
Yu Huang, Yi'an Wang, Suran Wang
Summary: The large-deformation shear flow of a particle system exhibits random characteristics, making accurate modeling difficult. This study conducted ring-shear experiments on common engineering materials to quantify the effect of dynamic crushing on the instability of shear flow. The fluctuation characteristics of the stress ratio are negatively correlated with the shear rate. The research on the fluctuation characteristics of particle systems will help in developing a dynamic model for landslide systems, improving prediction and prevention of landslide disasters.
Article
Geosciences, Multidisciplinary
Hualin Cheng, Yu Huang, Weijie Zhang, Qiang Xu
Summary: This study analyzed the formation conditions and physical processes of the catastrophic Hongchun gully debris flow, which occurred in the areas affected by the Wenchuan earthquake in 2010. The smoothed particle hydrodynamics method was used to reconstruct the flow process, and the hazard intensity and risk level were assessed using the ArcGIS platform. The study proposed a new hazard assessment model for debris flows and provided guidance for reconstruction planning in earthquake-hit areas.
Article
Engineering, Geological
Bei Zhang, Yu Huang
Summary: The impact behavior of superspeed granular flows is crucial for barrier design, but lacks sufficient understanding. This study used centrifuge modeling and numerical modeling to investigate the energy consumption mechanism during granular flow impacts and proposed a static failure mode to estimate the action force. Additionally, it was found that reduced scale models under lower stress conditions may underestimate the impact force.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Hongqiang Hu, Yu Huang, Liuyuan Zhao, Min Xiong
Summary: This study investigates the stochastic seismic responses of a slope reinforced by an anchored pile structure through shaking table tests. It is found that under random excitation, the seismic responses of the slope exhibit significant variability. The use of probabilistic methods allows for a more reliable assessment of the slope's seismic response.
Editorial Material
Environmental Sciences
Yu Huang, Jin Sun, Chongqiang Zhu
Article
Environmental Sciences
Hao Shi, Yu Huang
Summary: This article describes a multiphase extension of the delta-plus-SPH model for modeling non-Newtonian multiphase flow. Modifications are made to improve the accuracy and stability, including a modified numerical diffusive term and a special shifting treatment near the phase interface. The Herschel-Bulkley model is used to describe non-Newtonian fluids, and a sub-particle term is added in the momentum equation for large eddy simulation. The GPU acceleration technique is applied for computational efficiency. Tests show that the proposed SPH model can accurately capture highly transient incompressible two-phase flows with consistent pressure across the interface.
Article
Computer Science, Interdisciplinary Applications
Yu Huang, Zhengying He, Atsushi Yashima, Zhiyi Chen, Chunxiang Li
Summary: A framework for multi-objective optimization design of Pile-anchor structures (PAS) in slopes is proposed in this study, considering the uncertainty of soil properties. The framework incorporates reliability theory and Monte Carlo simulations to account for the spatial variability of soil properties. An illustrative example demonstrates that the optimal PAS design achieves minimum failure probability and lowest total cost.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Geosciences, Multidisciplinary
Hualin Cheng, Martin Mergili, Yu Huang
Summary: This study uses a numerical model to analyze the flow and sediment erosion processes of debris flows. The results show that the erosion models accurately predict the movement and channel erosion of the debris flows, and the most serious sediment erosion occurs along the sides of the channels. In addition, the model is applied to predict the dynamical behavior and bulking process of a specific debris flow, showing an increase in discharge and hazard intensity due to sediment erosion. This study provides more scientific basis for risk assessment and hazard mitigation of large-scale debris flows in mountainous areas.
Article
Geosciences, Multidisciplinary
Yu Huang, Hao Shi, Bei Zhang
Summary: In mountainous areas, rock avalanches can cause large impact forces on structures. Baffle systems are commonly used in torrent channels to dissipate flow energy and minimize destructive effects. This paper presents a crown-like baffle system that effectively dissipates flow energy through particle-particle interaction. The results show that the proposed baffle system can reduce the residual kinetic energy by up to 18.75% compared to a conventional baffle system, making it a cost-effective solution.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Engineering, Geological
Yu Huang, Boyu Fu, Zhen Guo, Atsushi Yashima
Summary: In this paper, a modified deformation coordination model is proposed to accurately calculate the internal force of anchored piles. The interaction between the anchor and pile is divided into two stages: the application of prestressed anchor cables and the action of landslide thrust. Using the virtual work principle and graph multiplication theory, a deformation coordination equation is established and the calculation formula for anchor cable tensile stress is obtained. An engineering case study demonstrates the capability of the proposed model to calculate the internal force of anchored piles.
SOILS AND FOUNDATIONS
(2023)
Article
Engineering, Geological
Yu Huang, Zhengying He
Summary: This study proposes a novel methodology for implementing rainfall-resilient design for slope systems by combining the resilience design philosophy and stability analysis. The design-oriented resilient criterion and recovery strategies for slope systems are analyzed and compared with traditional design criteria. This rainfall-resilient design can effectively support landslide mitigation in the coastal area of Southeast China.
SOILS AND FOUNDATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Dianlei Feng, Can Yi, Man Hu, Tao Gao, Yu Huang
Summary: In this study, a new soil turning numerical model based on the SPH method has been proposed, and an elastoplastic constitutive model has been implemented. The model was validated through a landslide benchmark test and a combined experimental numerical investigation on the soil turning process. The results show that the proposed SPH model can accurately reproduce the soil turning process.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Shaohui Liu, Lizhong Jiang, Wangbao Zhou, Jian Yu
Summary: This study evaluates the post-earthquake damage to track-bridge systems by conducting nonlinear time history analysis on a CRTS II ballastless track simply-supported beam system subjected to transverse earthquake loading. It explores the characteristics of residual displacement and stiffness degradation of the track-bridge system under transverse earthquakes. The research investigates the effect of earthquake-induced stiffness degradation on high-speed trains and proposes a reconstruction method for earthquake-induced dynamic irregularity characteristic curve considering probability guarantee rates. The results indicate that earthquake-induced dynamic irregularity can effectively quantify the running performance of high-speed trains under earthquake-induced stiffness degradation conditions.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Rui Zhang, Xiangqian Sheng, Wenliang Fan
Summary: This study introduces a novel approach for the probabilistic assessment of seismic earth pressure against nonlinear backfills. Nonlinear upper bound analysis is used to obtain the seismic earth pressure through optimization procedure, and probability analysis of nonlinear backfill properties is considered by combining adaptive dimension decomposition with the direct integral method.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Qiangqiang Sun, Yu Xue, Menghao Hou
Summary: This study investigated the use of Tire-derived aggregate (TDA) as backfill material for geotechnical seismic isolation in utility tunnels. Nonlinear numerical analyses were conducted, and the results showed that TDA backfill was an excellent alternative for risk mitigation during strong earthquakes, significantly reducing deformation and forces. The proposed system could potentially save costs compared to expensive seismic mitigation measures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Yan-Guo Zhou, Dong-Chao Zhang, Kai Liu, Yun-Min Chen
Summary: This study investigated the large deformations caused by liquefaction in sloping ground and the methods for evaluation and mitigation. Soil element tests and centrifuge model tests were conducted to study the relationship between residual strain and Post-liquefaction Deformation Potential (PLDP). The tests showed that the developments of residual strain were controlled by PLDP, which is correlated with the maximum cyclic shear strain. The applicability of PLDP was verified in model tests, and the mitigation mechanisms of densification and drainage induced by stone columns were observed.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jiajin Zhao, Zhehao Zhu, Dexuan Zhang, Hao Wang, Xi Li
Summary: This paper studies the fabric properties during sand liquefaction using 3D constant-volume cyclic triaxial DEM tests. The results show good consistency with experimental data. The evolution of fabric characteristics is assessed using the coordination number and mechanical coordination number. The second-order contact normal fabric tensor is introduced to analyze complex inter-particle contacts and the shear strain is used as a bridge to describe the evolution of coordination number and anisotropy degree.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jinqiang Li, Zilan Zhong, Shurui Wang, Kaiming Bi, Hong Hao
Summary: The corrosion-protection liner technology improves the seismic performance of water supply pipelines and reduces the failure probability under earthquake excitations.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Abdellah Cherif Taiba, Youcef Mahmoudi, Mostefa Belkhatir
Summary: This article provides a comprehensive analysis of Liu et al.'s (2023) published paper in the Soil Dynamics and Earthquake Engineering journal, which examines the impact of particle shape on the wave velocity of sand. By enhancing the content integrity, this article serves as a valuable discussion piece for readers interested in this research topic.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Weijian Zhong, Binbin Li, Yanhui Liu, Ping Tan, Fulin Zhou
Summary: In this paper, the Flexible Limit Protective Device (FLPD) was improved to a Flexible Energy Dissipating Device (FEDD) to better control the seismic response of base-isolated structures. Experimental investigation and numerical simulation were conducted to study the compression behavior and optimize the design of FEDDs. The results showed that FEDDs with optimal parameters effectively reduced isolator displacements and kept the inter-story drift angle within a safe range during earthquakes.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Xinhua Xue, Xiaojie Yuan, Li Tao
Summary: In this study, gene expression programming (GEP) was used to establish the relationship between the capacity energy required to trigger sand liquefaction and several major parameters. The GEP model showed higher accuracy and better performance compared to existing models, as confirmed by experimental data.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Xiao-ling Zhang, Hao Lan, Xian-hui Zhao, Cheng-shun Xu, Ke-min Jia
Summary: The study investigates the reinforcement principle of inclined liquefiable site using concrete pile and gravel pile methods. The results show that concrete piles have a better reinforcement effect on inclined liquefiable site compared to gravel piles, and increasing the diameter of gravel piles greatly improves the reinforcement effect. The pile group reinforcement model is more effective in reducing lateral displacement of the site soil compared to the single pile reinforcement model.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jinxin Sun, Haoyu Sun, Mengmeng Lu, Bolin Han
Summary: The implementation of stone columns is an effective way to improve the stability of liquefiable soil. However, existing mathematical models often neglect vertical seepage within the soil, leading to calculation errors. This study proposes a new mathematical model that considers both radial and vertical seepage, and conducts a parameter analysis to investigate the effects of column spacing, cyclic stress ratio, and consolidation parameters on excess pore water pressure.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jonathan F. Hubler, James P. Hanley, Andrew C. Stolte, Liam Wotherspoon, Kyle M. Rollins
Summary: This study performed blast liquefaction tests in an area that experienced extensive liquefaction. It used multi-channel analysis of surface waves (MASW) testing to evaluate changes in shear wave velocity (VS) before and after blasting. The study found that array length has an impact on the immediate changes in VS following blasting, but these changes decrease at 24 hours post-blast.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Lowell Tan Cabangon, Gaetano Elia, Mohamed Rouainia, Suraparb Keawsawasvong, Teraphan Ornthammarath
Summary: The impact of far-field earthquakes on underground structures, especially tunnels, has been relatively less explored compared to near-field earthquakes. However, the study found that far-field earthquakes can generate forces in tunnel lining that are equally destructive as those induced by near-field motions, especially when they contain long-period waves. The amplification of these ground motions in soft natural clays, common in Bangkok, can lead to significant soil displacements and shear strains.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jinjun Hu, Longbing Ding, Xutong Zhou, Mingji Liu, Jingyang Tan
Summary: Offshore near-fault ground motions during the 2016 OffMie Mw6.0 earthquake in the Nankai Trough of Japan were studied using data from the DONET1 seafloor seismic network. The results show that offshore spectral acceleration and peak ground velocity are higher than onshore values. Analysis of pulse-like ground motions reveals differences in amplitude, frequency content, and energy between offshore and onshore motions. These findings have implications for seismic design of offshore engineering structures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Radu Popescu, Pradipta Chakrabortty
Summary: The natural spatial variability of soil properties affects the mechanical response of geotechnical structures and can deviate failure surfaces. For soil liquefaction induced by seismic activity, it has been found that greater excess pore water pressure is generated in soils with small-scale variability. This paper provides an explanation based on centrifuge experiments and numerical simulations, showing that partial drainage during earthquakes may trigger softening of dilative soils.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)