Article
Computer Science, Interdisciplinary Applications
Gan Wang, Rui Pang, Xiang Yu, Bin Xu
Summary: Studying the influence of mainshock-aftershock sequences on the reliability of soil slopes is of great significance for disaster prevention. This paper proposes a new analysis method for random dynamic response analysis and permanent displacements reliability evaluation of soil slopes considering the uncertainty of the mainshock-aftershock sequences. The method includes a simulation method of random seismic sequence based on Copula function, calculation of permanent displacement under different seismic sequences, analysis of aftershock influence, and probability evaluation using the probability density evolution method. The results show that the randomly generated mainshock-aftershock sequence can meet the needs of random dynamic analysis and probability analysis of soil slope, and the slope has larger permanent displacement under mainshock-aftershock sequences compared to single mainshocks. The influence of aftershocks on the slope reliability is explained for the first time, highlighting the necessity of studying this influence from a probability perspective.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Shun Yi, Jian Chen, Jia-jun Pan, Jue-hao Huang, Yue-feng Qiu
Summary: This study aims to investigate the influence of interlayer variability and spatial variabilities of intralayer soil parameters on the mechanical responses of a layered slope. An integrated random field is developed using FLAC program to characterize the uncertainty of intralayer and interlayer spatial variabilities. Monte-Carlo simulation is conducted to evaluate the influences of these variabilities on slope stability and risk. The results show that the failure mode of a two-layered slope changes significantly due to the stochastic layered boundary, and ignoring the uncertainty arising from layered boundary and transition zone may underestimate the probability and risk of slope failure. The proposed equations can be valuable for investigating the probability and risk associated with layered slopes.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Min Du, Sherong Zhang, Chao Wang, Lei She, Jiabei Li, Tong Lu
Summary: This study aims to assess the seismic fragility of the aqueduct bent structure subjected to mainshock-aftershock (MS-AS) ground motion sequences. A finite element model of the structure is developed and validated through physical tests. Nonlinear dynamic time-history analysis is conducted to obtain the seismic response of the structure under different ground motion intensities. The fragility surfaces of the structure are developed based on the proposed probabilistic seismic demand model, considering both mainshock and aftershock intensities. The results indicate the importance of aftershocks in the seismic risk assessment and can support seismic optimization design and post-earthquake repair-demand.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Geological
Yang Zhou, Mingyuan Jing, Rui Pang, Bin Xu
Summary: This paper presents a method for the probabilistic analysis and reliability evaluation of retaining walls. It examines the stochastic dynamic response of rigid cantilever retaining walls subjected to mainshock-aftershock sequences. A variable generation strategy and copula function are used to establish the correlation between mainshocks and aftershocks. The direct probability integral method (DPIM) is utilized to estimate the reliability of the retaining wall under stochastic seismic sequences. The results show that dynamic reliability of different physical quantities can be obtained without assuming their probability distribution. The study also demonstrates that the reliability of the retaining walls is degraded by aftershocks, with the degree of degradation increasing with higher design requirements.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Construction & Building Technology
Xiulin Li, Weiping Wen, Changhai Zhai
Summary: The study proposes a probabilistic framework for evaluating the lifecycle cost of structures under multiple mainshock-aftershock sequences. The results indicate that multiple aftershocks increase the lifecycle cost of structures, and ignoring repair status underestimates the cost.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Geological
Zhen-Dong Cui, Tian -Yu Sui, Su-Yang Wang, Li Yuan
Summary: This paper investigates the dynamic response and damage development process of a subway station under the mainshock-aftershock sequence through a series of centrifuge shaking table tests. The study reveals that the mainshock-aftershock sequence results in a reduction of the horizontal deformation capacity of columns and damage accumulation. Subway stations located in dry sand sites are more susceptible to damage, while liquefiable sites are partially protected by liquefied layers.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Industrial
Rui Pang, Dezhi Zai, Bin Xu, Jun Liu, Chunfeng Zhao, Qunying Fan, Yuting Chen
Summary: This study proposes a new framework to analyze the effects of stochastic seismic sequences on the dynamic response and reliability of AP1000 nuclear power plants (NPPs). Stochastic mainshock-aftershock sequences are generated, and the effects of aftershocks on NPPs are highlighted using acceleration and displacement as response indices and damage indicators. The probabilistic information and reliability of NPPs are obtained based on the direct probability integration method and the absorbing condition method. The results show that seismic sequences have a larger dynamic response and cause more damage to the NPPs compared to a single mainshock. Aftershocks reduce the reliability of NPPs, and the degree of reduction is related to the thresholds.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Engineering, Civil
Amir H. Farivarrad, Homayoon E. Estekanchi
Summary: The seismic performance of postmainshock buildings considering seismic mainshock-aftershock sequences is investigated. The study compares the results obtained from the endurance time method and nonlinear incremental dynamic analysis, and highlights the significance of residual seismic response caused by the mainshock and the direction of applied aftershocks in evaluating postmainshock buildings.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Construction & Building Technology
Seyed Alireza Jalali, Ali Amini, Iman Mansouri, Jong Wan Hu
Summary: This study evaluates the effect of mainshock-aftershock sequences on the collapse of steel plate shear wall systems. The research shows that prior mainshock damage mainly affects collapse capacity by consuming energy absorption capacity of infill plates, causing strength deterioration. Structures were found to collapse when their first-story columns reach a threshold softening level, regardless of the level of mainshock damage.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2021)
Article
Engineering, Civil
Marziyeh Ghasemi, Hossein Khorshidi, Nader Fanaie
Summary: This study compares the performance of Reinforced Concrete Moment Resisting Frames with Shape Memory Alloy and Ultra-High-Performance Steel Fiber Reinforced Concrete under mainshock and aftershock sequences. The results show that utilizing SMA and UHPSFRC together can effectively reduce transient and residual drifts in structures, improving their functionality post-earthquake.
Article
Engineering, Geological
Chunfeng Zhao, Lei Zhou, Shenjiang Huang, Avinash Gautam
Summary: This study investigates the impact of aftershock duration on the seismic fragility of shield buildings using a three-dimensional finite element model, showing that longer duration aftershocks may worsen cumulative damage to already damaged structures, while initial damage levels significantly affect fragility curves.
BULLETIN OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
Haizuo Zhou, Qichao Hu, Xiaoxuan Yu, Gang Zheng, Xiangning Liu, Huajun Xu, Shangchuan Yang, Jun Liu, Kan Tian
Summary: The paper evaluates the probabilistic bearing capacity of a strip footing placed near a two-layered cohesive soil slope using random adaptive finite element limit analysis combined with anisotropic random field modeling and Monte Carlo simulation techniques. The study quantitatively examines the bearing capacity by considering the combined effect of geometric parameters, soil properties, and spatially variable strengths of the two-layered soil. The results highlight the significant influence of the slope angle and the potential reduction in the coefficient of variation of the ultimate bearing capacity factor through decreasing the variability of the upper layer soil.
Article
Environmental Sciences
Weijie Huang, Yuanmin Yang, Rui Pang, Mingyuan Jing
Summary: This study proposes a new method for stochastic dynamic response analysis and reliability assessment of dams during seismic sequences. The method considers the dependence between mainshocks and aftershocks using the Copula function. The findings show that the method has exceptional precision and efficiency.
Article
Engineering, Geological
Yongqun Zhang, Zhuolin Wang, Lixue Jiang, Konstantinos Skalomenos, Dongbo Zhang
Summary: This study investigates the impact of aftershocks on unreinforced masonry structures and proposes an analytical method to estimate the maximum storey drift under M-A sequences, which is validated using finite element analysis. A parametric analysis shows that aftershock intensity, anti-seismic wall area ratio, site classes, number of storeys, and mortar strength all play a role in the seismic responses of masonry structures under M-A sequences.
BULLETIN OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Yongqun Zhang, Zhuolin Wang, Lixue Jiang, Konstantinos Skalomenos, Dongbo Zhang
Summary: Earthquake investigations have shown that strong aftershocks can worsen structural damage, but little attention has been given to understanding the seismic performance of masonry structures under aftershocks. This study proposes a simplified probabilistic approach to examine the seismic fragility of masonry structures considering the impact of aftershocks. Through Monte Carlo simulation, 36,000,000 stochastic earthquake-structure samples were generated to consider uncertainties related to ground motions and structures, and fragility curves were obtained by considering various parameters. The results revealed that aftershocks have a significant influence on the fragility of masonry structures, and the number of storeys is the most influential parameter.
ENGINEERING STRUCTURES
(2023)
