Article
Construction & Building Technology
Han Qin, Luyu Li
Summary: In this paper, a new amplitude variability model is proposed based on the energy spectra records of earthquakes. The model captures the changes in spectra by measuring the similarity between two locations and dividing the spectra into averaged and random variation parts. The effectiveness of the model is validated through Monte Carlo simulations.
Article
Chemistry, Multidisciplinary
Ning Zhao, Zhilong Xu, Liuliu Peng, Xiaolong Li, Xiaowei Chen, Xuewei Wang
Summary: An enhanced interpolation approach is developed for simulating nonseparable nonstationary ground motions based on the spectral representation method, which reduces Cholesky decomposition time and optimizes FFT technique. The method achieves a balance between accuracy and efficiency, as confirmed by numerical examples.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Gopala Krishna Rodda, Dhiman Basu
Summary: This paper introduces an evolutionary power spectral density (EPSD)-based framework for simulating nonstationary ground motion, which improves the simulation accuracy by accounting for nonstationarity in addition to phase and amplitude variabilities.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2021)
Article
Engineering, Geological
Shuoyu Liu, Liuliu Peng, Jun Liu, Shuang Zhao, Zhongming Jiang
Summary: This study develops an efficient SRM-based method using a simple interpolation strategy and a quadratic regularization projected Barzilai-Borwein assisted non-negative matrix factorization. By pre-determining the distribution of interpolation nodes and decoupling the decomposed spectra, the method effectively reduces the computational cost of spectral matrix decomposition. This approach achieves the required matrix decomposition for SRM through a combination of interpolation and matrix factorization techniques.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Gopala Krishna Rodda, Dhiman Basu
Summary: This paper investigates the applicability of two frameworks based on CSD and ASD for rotational ground motion, explores spatially varying rotational ground motion for a future event, and examines the choice of representation of ASD.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
X. Z. Cui, H. P. Hong
Summary: An iterative algorithm is proposed in this study to simulate nonstationary and non-Gaussian seismic ground motions, considering time- and frequency-dependent coherence, and its adequacy is numerically validated using simulated ground motions.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2021)
Article
Engineering, Mechanical
Yi-Ming Zhang, Zifeng Huang, Yong Xia
Summary: Obtaining accurate evolutionary spectrum and time-varying coherence for multivariate nonstationary processes is important in engineering applications. However, estimating the time-varying coherence is challenging and has been rarely studied for a single realization of a nonstationary process. To address this issue, an improved multi-taper S-transform (MTST) method is proposed, which reduces the variance of the estimates with a sufficient time-frequency resolution. The technique uses different number of tapers at each frequency to achieve a trade-off between resolution and variance.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Computer Science, Artificial Intelligence
Heng Guo, Fumio Okura, Boxin Shi, Takuya Funatomi, Yasuhiro Mukaigawa, Yasuyuki Matsushita
Summary: Multispectral photometric stereo (MPS) aims to recover the surface normal of a scene measured under multiple light sources with different wavelengths. This paper proposes a new method that alleviates restrictive assumptions in existing MPS methods and investigates surfaces with spatially-varying reflectance. Experimental results demonstrate the effectiveness of the method and show its potential applicability for multispectral heritage preservation.
INTERNATIONAL JOURNAL OF COMPUTER VISION
(2022)
Article
Engineering, Geological
Zhen Liu, Shibo Zhang
Summary: This paper investigates the effect of spatial variations in ground motion on a long-span steel box arch bridge during violent earthquakes. Through shaking table experiments and finite element analysis, it is found that spatial variations in near fault ground motion can lead to severe seismic responses.
BULLETIN OF EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
Yilin Chen, Brendon A. Bradley, Jack W. Baker
Summary: This study introduces new techniques for quantifying nonstationary spatial variations in strong ground motion using data from recent earthquakes in New Zealand. The results show strong nonstationarity in spatial correlation in Wellington and Christchurch, with heterogeneous geologic conditions associated with this phenomenon. Factors influencing nonstationary spatial correlation include site-specific residuals, earthquake effects, rupture complexity, and the inability to resolve site-specific correlations using certain terms in Ground-Motion Models.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2021)
Article
Engineering, Civil
Jianian Wen, Kaiming Bi, Li Xu, Dezhang Sun, Qiang Han, Xiuli Du
Summary: The out-of-phase vibration between neighboring structures due to different vibration characteristics and spatially varying seismic excitations can cause strong impact between adjacent structural components and result in detrimental damage to the structures. In order to prevent such damage, the gap size of the expansion joint and the vibration period ratio between adjacent structures need to be carefully selected. This study extends the performance-based seismic design (PBSD) framework to optimize the gap size and period ratio between a cable-stayed bridge and its approach spans under spatially varying ground motions.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Jin Zhang, Ke-Jian Chen, Yong-Ping Zeng, Zhen-Yu Yang, Shi-Xiong Zheng, Hong-Yu Jia
Summary: In this paper, a direct probabilistic framework was developed to evaluate the seismic system reliability analysis of cable-stayed bridges subjected to spatially varying ground motions. Through establishing a 3D finite element model and conducting nonlinear time history analysis, the probability density function and failure probability of the structural response were obtained, leading to some critical conclusions.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Engineering, Civil
Zhenyu Du, Tong Guo, Jishuai Wang, Shuqi Yu
Summary: This paper focuses on the effect of site-structure cluster interaction (SSCI) on the seismic response of densely distributed buildings. By extracting influential parameters and using a wavelet packet neural network, the spatially varying ground motion in the urban environment can be simulated rapidly. The proposed framework considers various factors and is superior to conventional artificial neural networks.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Engineering, Civil
Duruo Huang, Gang Wang, Chunyang Du, Feng Jin
Summary: This study investigates the impact of spatial variability of soils on seismic site amplification, utilizing 2D Spectral Element Method. Key factors influencing the site amplification include variation and spatial correlation of shear wave velocity, with correlation range shown to be frequency dependent. The analyses suggest that both soil heterogeneity and wavelength scales should be considered when quantifying the spatial variability of ground motion amplification.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
Wenqi Du, Sen Long, Chao-Lie Ning
Summary: This paper presents an algorithm for selecting ground motions from a database for multiple sites under earthquake scenarios. The algorithm constructs the target distribution of spectral accelerations at multiple sites by considering the spatial correlation of ground motions. It then randomly simulates response spectra and selects recorded ground motions that match the simulated spectra. Validation examples demonstrate that the selected ground motions realistically capture the target distribution of response spectra. The computational expense of the algorithm is found to be generally acceptable. The algorithm can be used for selecting ground motions as inputs for dynamic analysis of spatially distributed buildings.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Fei Zhang, Guangyu Dai, Yufeng Gao, Jie Bian
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2020)
Article
Computer Science, Interdisciplinary Applications
Jian Ji, Weijie Zhang, Fei Zhang, Yufeng Gao, Qing Lu
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Geological
Shangchuan Yang, Yufeng Gao, Ben Leshchinsky, Kai Cui, Fei Zhang
GEOTEXTILES AND GEOMEMBRANES
(2020)
Article
Engineering, Geological
Shangchuan Yang, Yufeng Gao, Kai Cui, Fei Zhang, Di Wu
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2020)
Article
Engineering, Geological
Shangchuan Yang, Ben Leshchinsky, Kai Cui, Fei Zhang, Yufeng Gao
Summary: This study uses upper-bound kinematic limit analysis to determine the mechanism of failure and bearing capacity factors for shallow foundations near slopes subject to seismic action. The seismic bearing capacity factors are influenced by transitions in failure mechanism, soil properties, and finite configurations of slope and footing geometry, demonstrating significant non-linearity.
Article
Engineering, Civil
Zhou Zheng, Gao Yufeng, Zhang Fei, Song Jian, Zou Degao
EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
(2020)
Article
Engineering, Geological
G. H. Lei, F. X. Liu, F. Zhang
ENGINEERING GEOLOGY
(2020)
Article
Engineering, Geological
YuFeng Gao, Lei Hang, Jia He, Fei Zhang, Leon Van Paassen
Summary: The BG system, which combines biocementation with geosynthetic materials, effectively increases pullout resistance compared to the OG system in laboratory tests. This innovative concept shows improved performance in enhancing the pullout resistance of geosynthetic reinforcements.
GEOTEXTILES AND GEOMEMBRANES
(2021)
Article
Engineering, Marine
Binpeng Zhou, Bin Li, Fei Zhang, Siguo Liu, Yizheng Li
Summary: A vibration test was conducted on large-diameter steel cylinders surrounding the artificial islands of the Hong Kong-Zhuhai-Macau Bridge, with results showing that the components experienced normal performance during vibration, providing important reference for design and safety evaluation.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Shangchuan Yang, Wei Ci, Ben Leshchinsky, Kai Cui, Fei Zhang
Summary: The study investigates the scale effects of rectangular footings near slopes, finding that ignoring scale effects may lead to overly conservative design for bearing capacity. It also concludes that footing shape influences the observed failure mechanism, and a larger internal friction angle can amplify the observed bearing capacity scale effects.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Fei Zhang, Yuming Zhu, Yanbo Chen, Shangchuan Yang
Summary: Current design methods for GRS walls often lead to insufficient reinforcement loads required for seismic stability due to pseudo-static analyses. This study aims to calculate the distribution of reinforcement loads and connection strength for each layer of seismic GRS walls, and conducts parametric studies to investigate seismic impacts on stability and lateral deformation.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Di Wu, Yuke Wang, Fei Zhang, Yue Qiu
Summary: The study developed a three-dimensional limit analysis method for evaluating slope stability considering pore-water pressures using the pore-water pressure coefficient. By comparing the linear and nonlinear strength envelopes, the study found that linear Mohr-Coulomb envelope overestimates the critical height of slopes under pore-water pressures. Results also showed that as the pore-water pressure coefficient increases, the critical slip surfaces of gentle slopes with nonlinear strength criteria become shallower.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Bin Ge, Huaining Ruan, Shuang Shu, Fei Zhang, Yufeng Gao
Summary: This study conducts a pseudo-static analysis based on limit equilibrium theory to calculate the distribution of required tension in geosynthetic-reinforced soil (GRS) walls under seismic conditions. The effects of various factors on the seismic stability of GRS walls are investigated. The results show that seismic acceleration amplification leads to increased reinforcement tension, particularly in the lower layers of the wall. Lengthening the bottom reinforcement layers can help reduce the required tension and mitigate the risk of reinforcement failure.
GEOTEXTILES AND GEOMEMBRANES
(2022)
Article
Engineering, Civil
Guangyu Dai, Fei Zhang, Yuke Wang
Summary: This study presents stability analyses of layered soil slopes in unsaturated conditions and determines the factor of safety involving suction stress of unsaturated soil using a limit equilibrium method. The obtained results show that larger suction stress provided in unsaturated clay dominates the stability of the layered slopes, while the location and thickness of the clay layer have significant influences on slope stability.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Geological
Zhang Fei, Jia Shi-lin, Zhu Yu-ming, Lu Xiao-yi, Shu Shuang
Summary: Stability analyses of reinforced multi-tiered walls were conducted based on the limit equilibrium method to calculate the required strength of geosynthetics. The distribution of required strength and connection strength to the facing for each layer can help avoid composite failures due to insufficient reinforcement length, and connection strength should suddenly increase at the step. The critical offset distance and reinforcement tensile strength distribution are consistent with FHWA recommendations, conservatively estimating wall stability.
ROCK AND SOIL MECHANICS
(2021)