Ruizhi Wen

Ruizhi Wen
China Earthquake Administration

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110
Publications
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769
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Publications

Publications (110)
Article
Full-text available
The conditional mean spectrum (CMS) and its generalized forms, like the generalized CMS (GCMS), and the CMS conditioned at the logarithm-average spectral acceleration over a period range (CMS-AvgSa), are anchored on a conditional period (or periods) with a target hazard level. This study evaluated the vector hazard of multiple spectral acceleration...
Article
A simplified procedure is proposed to generate artificial non-stationary multi-point ground motion inputs for the dynamic seismic analysis of long span or large scale structures. The probability distribution parameters for the phase difference were fitted using 438 recordings selected from Center for Engineering Strong Motion Data. Then the time cu...
Article
Full-text available
Seismic site classification, which is fundamental for site-specific seismic hazard assessment, also plays an important role in accurate interpretation of ground motion data. However, detailed borehole information is not always available in many countries, e.g., China. Therefore, this study investigated application of the generalized regression neur...
Article
Full-text available
The South China Sea (SCS) is recognized as a zone at high risk of tsunamis, which makes surrounding areas suitable for conducting probabilistic tsunami hazard assessment (PTHA). Most previous PTHAs were conducted with consideration of either local or regional potential tsunami sources (PTSs). In this study we developed a PTHA framework for the coas...
Article
A computer-simulation-based three-stage optimization strategy is proposed for the resilience enhancement of urban gas distribution networks (GDNs). In stage I (pre-earthquake stage), the Fixed Proportion and Direct Comparison Genetic Algorithm (FPDC-GA) is applied to select key pipelines need to be strenthened or replaced under limited funding in p...
Preprint
Full-text available
A computer-simulation-based three-stage optimization strategy is proposed for the resilience enhancement of urban gas distribution networks (GDNs). In stage I (pre-earthquake stage), the Fixed Proportion and Direct Comparison Genetic Algorithms (FPDC-GA) are applied to select key pipelines for repair or replacement under limited funding in preparat...
Preprint
Full-text available
Seismic site classification, which is fundamental for site-specific seismic hazard assessment, also plays an important role in accurate interpretation of ground motion data. However, detailed borehole information is not always available in many countries, e.g., China. Therefore, this study investigated application of the generalized regression neur...
Article
Full-text available
For mainland China, the primary obstacle in conditional spectrum (CS) based ground motion selection work is that the corresponding seismic hazard disaggregation results were not released for the China national standard GB 18306–2015 “Seismic Ground Motion Parameter Zonation Map”, which refers to the fifth-generation seismic hazard map. Therefore, t...
Article
It is crucial to include additional site amplification effects resulting from the thick sediment on ground motions in the reliable assessment for seismic hazard in sedimentary basins. Ground-motion residual analysis with respect to ground-motion prediction equation is performed to evaluate additional site amplifications at over 200 K-NET stations w...
Article
On 12 July 2020, an Ms 5.1 moderate earthquake occurred on the north segment of the Tangshan fault in North China, which was the seismogenic fault of the 1976 Ms 7.8 Tangshan earthquake and numerous small-to-moderate earthquakes in recent decades in the Tangshan seismic zone. The Ms 5.1 event was well-recorded by dense ground-motion observation sta...
Book
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This book focus on the multiple level ground motion selection for different engineering demand: (1) Ground motion input for China seismic design code by matching the target design spectrum; (2) China hazard consistent ground motion selection; (3) Determination of the ground motion input for performance based earthquake engineering; (4) Ground mot...
Preprint
Full-text available
For mainland China, the primary obstacle in conditional spectrum (CS) based ground motion selection work is that the corresponding seismic hazard deaggregation results were not released for the China national standard GB 18306- 2015 “Seismic Ground Motion Parameter Zonation Map”, which refers to the fifth-generation seismic hazard map. Therefore, t...
Article
This study developed an approach for selecting sets of ground motion recordings that match a target conditional multivariate distribution of ground motion intensity measures (IMs). This was achieved by applying a genetic algorithm (GA) that treats IMs of interest of each recording as a “chromosome” and the set of the desired number of recordings as...
Article
Full-text available
The selection of strong motion records leads to the uncertainty of structural dynamic analysis. This paper proposes to build the target spectrum for selecting strong motion records, based on PGA and spectral acceleration attenuation relationship. According to site conditions, the strong motion records are selected to match the target spectral shape...
Article
Full-text available
In this paper, PEER Ground Motion Databases (PGMD) at the Pacific Earthquake Engineering Research Center (PEER) was updated by 141 groups of ground motion records in Japan Tohoku earthquake on March 11, 2011,which expanded the limitation of this database. Following the disaggregation results from probabilistic seismic hazard analysis, the scenario...
Article
Full-text available
The strong-motion recordings selection has a lot of influence to the analysis result of the earthquake resistant design, and has been a hot issue in the field of earthquake engineering. On the selection of strong-motion recordings, details of the provisions codes are sketchy in the current seismic, and then they are hardly carried out. In this pape...
Article
Full-text available
We separated the propagation path attenuation and source spectra from the S-wave Fourier amplitude spectra of the observed ground motions recorded during 46 small-to-moderate earthquakes in the junction of the northwest Tarim Basin and Kepingtage fold-and-thrust zone, mainly composed of two Jiashi seismic sequences in 2020 and 2018. Slow seismic wa...
Article
Full-text available
This study used earthquake records from China to investigate comprehensively the correlation coefficients between various intensity measures (IMs), including peak ground acceleration, peak ground velocity, spectral acceleration, spectrum intensity, acceleration spectrum intensity, Arias intensity, cumulative absolute velocity, and significant durat...
Article
Full-text available
This study aims to determine a proper input number of strong motion recordings for structural time-history analysis in China seismic design code. The cumulative probability curves of structural response under different number of records were simulated using 500 times of Monte Carlo samplings based on the assumption that the seismic demand can be re...
Article
Full-text available
Considering the traditional hazard demand computation methods ignoring the hazard consistency and the relatively high computation cost, an improved multiple stripe method is proposed according to requirement of the third PBEE (Performance Based Earthquake Engineering), that is to closely link with the probability seismic hazard analysis results in...
Article
Full-text available
Observed ground-motion intensity for six earthquakes of Mw = 6.0–6.2 that occurred in China’s North–South Seismic Zone (NSSZ) was compared with predicted medians from the BSSA14 model. The resulting between-event (δBe) and within-event (δWes) residuals for peak ground acceleration and pseudo-spectral acceleration up to 5.0 s were used to investigat...
Article
Full-text available
With the ground motion accumulation and widespread use of structural dynamic analysis, more and more attention was paid to the ground motion selection which is the fundamental work for structural seismic performance analysis. This paper reviews the records selection work according to the seismic design framework, hazard consistent earthquake scenar...
Article
Full-text available
The stress drop (Δσ) is a fundamental parameter used to quantify source physics, and its uncertainty is closely related to seismic hazard. To reveal the relationship between Δσ uncertainty and resultant ground-motion variability, ground motions produced by the 2013 Mw6.6 Lushan earthquake, characterized by various Δσ values, are simulated using the...
Article
Full-text available
https://www.sciencedirect.com/science/article/pii/S0267726119301915 Spectral ratio methods have been widely used in evaluation of nonlinear seismic site response. Nevertheless, it remains inefficient and subjective to identify stations with nonlinear site response according to empirical threshold values of spectral ratio nonlinear degree indicator...
Article
Full-text available
To analyze the source characteristics of the 2016-2017 central Italy seismic sequence, source spectra of 78 earthquakes of M L = 3.5-6.1 were separated from the S wave Fourier spectra using the two-step nonparametric generalized inversion technique. Source parameters (e.g., stress drop) were estimated from the source spectra following the ω-square...
Article
Full-text available
The strong ground-motion records selection in structural collapse fragility analysis was studied. To consider the seismic hazard difference within target sites, the conditional mean spectrum ( CMS) was used as the target spectrum for ground-motion records selection in the increment dynamic analysis ( IDA) method. The CMS was constructed through the...
Conference Paper
Full-text available
With a large number of strong motion records captured over the world every year, the records selection work is generally needed in dynamic structural dynamic analysis nowadays. First, the recordings are collated from NGA-West1 dataset and Chinese National Strong Motion Observation Network System (NSMONS, 2007 to 2015 year) to construct the dataset...
Article
Full-text available
The ground motion selection procedure of important key structures considering the hazard un - consistency and conservative characteristic of current target uniform hazard spectrum ( UHS) in the safety evaluation work was focused on. The concept of conditional mean spectrum ( CMS) and conditional spectrum ( CS) are firstly introduced, than the overa...
Article
Full-text available
The ground-motion selection is neglected on the traditional fragility demand curve of structural seismic engineering, and the seismic hazard is rarely considered. The conditional mean spectrum (CMS) ground-motion selection method was introduced into the IDA method and stripe method to solve the problem, and compared with the traditional cloud metho...
Article
The earthquake damages of engineering structures have been affected by the amplitude, frequency and duration of the strong motion records. However, there are relatively few published duration equations available in Chinese mainland. In this paper, we collected the strong motion records with magnitude M W 5.0-6.6 during 2007-2015 from Chinese digita...
Article
Full-text available
The standard deviation of ground-motion prediction equation under the ergodic assumption is commonly used for the site-specific probabilistic seismic hazard analysis. However, this assumption leads to overestimations of site-specific ground-motion variability. The single-station standard deviation (σss) after removing the ergodic assumption on site...
Article
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This paper aims at implementing and introducing the use of conditional mean spectrum (CMS) and conditional spectrum (CS) as the main input parameters in the practice of seismic safety evaluation (SSE) in China, instead of the currently used uniform hazard spectrum (UHS). For this purpose, a procedure for M-R-epsilon seismic hazard deaggregation in...
Article
Full-text available
This study used the spectral inversion technique to investigate the source characteristics, site effects, and path attenuation of S-wave Fourier amplitude spectra recorded in the Mw 7.8 Kaikōura, New Zealand, earthquake sequence. For this purpose, we assembled a dataset comprising 2445 strong-motion recordings, obtained at 126 GeoNet stations, of 1...
Article
Full-text available
Strong-motion recordings observed during theMs 7.0 Jiuzhaigou earthquake, which occurred on 8 August 2017 in western China, were used to reveal the underlying source, propagation path, and site effects in comparison with observations from the 2013 Lushan earthquake of identical magnitude (Ms 7.0). The similar VS30 distributions at the strong-motion...
Article
Full-text available
Secondary (S) wave amplitude spectra from 928 strong-motion recordings were collected to determine the source spectra, path attenuation and site responses using a non-parametric generalized inversion technique. The data sets were recorded at 43 permanent and temporary strong-motion stations in 132 earthquakes of M-s 3.2-6.5 from 2008 May 12 to 2013...
Article
Full-text available
The consideration of soil nonlinearity is important for the accurate estimation of the site response. To evaluate the soil nonlinearity during the 2008 Ms8.0 Wenchuan Earthquake, 33 strong-motion records obtained from the main shock and 890 records from 157 aftershocks were collected for this study. The horizontal-to-vertical spectral ratio (HVSR)...
Article
Full-text available
With a large number of strong motion records captured over the world every year, the records selection work is often required in structural dynamic analysis nowadays. First, the recordings from U.S. PEER NGA-West1 dataset and Chinese national strong motion observation network system (2007-2015) are collated to construct the dataset for records sele...
Article
Full-text available
An Mw6.2 earthquake occurred in Central Italy on August 24, 2016. The objective of this study was to reveal the imprint of rupture directivity using the strong motion recordings. The strong motion stations were separated into two groups: southeast (SE) and northwest (NW). The effects of rupture directivity on the peak ground acceleration (PGA), pea...
Article
Full-text available
On August 8, 2017 an MS7.0 earthquake rocked Jiuzhaigou, Sichuan Province. The China Strong-Motion Networks Center (CSMNC) officially released 66 strong-motion recordings collected during this event. Eight of them obtained at stations up to 150 km from the hypocenter, of which the site responses are available, were used to retrieve the source spect...
Article
Full-text available
Reliable site classification of the stations of the China National Strong Motion Observation Network System (NSMONS) has not yet been assigned because of lacking borehole data. This study used an empirical horizontal-to-vertical (H/V) spectral ratio (hereafter, HVSR) site classification method to overcome this problem. First, according to their bor...
Article
Full-text available
Conditional mean spectrum (CMS) is increasingly being accepted as a more reasonable target spectrum for selecting earthquake records than uniform hazard spectrum. Construction of CMS requires the determination of correlation coefficients of spectral accelerations. This article presents the first investigation of correlation coefficients based on ea...
Article
Full-text available
It is primary for making the structure seismic design to have a reliable local site classification. This paper firstly reviewed and evaluated the traditional methods of site classification. Then a new popular method is introduced which is usually called the horizontal/vertical spectral ratio method based on the strong motion recordings. Considering...
Article
For investigating the rupture directivity effect of the central Italy MW6.2 earthquake on August 24, 2016, more than 150 strong motion stations are separated into two groups, which are SE and NW, according to the fault strike. Comparing the PGA, PGV, pseudo-acceleration response spectrum (PSA) and significant duration DSR of two groups, the results...
Article
Full-text available
To select real strong motions for Chinese seismic safety evaluation work, we disaggregated the result of Chinese seismic safety evaluation work into specified earthquake scenarios considering magnitude, distance and earthquake variation, and then the condition median spectrum was constructed as strong motion selection target. The results based on c...
Article
Full-text available
First, strong-motion recordings from an Mw 4.4 earthquake with symmetrical rupture were regarded as empirical Green’s functions (EGFs) to simulate ground motions produced by the 2013 Mw 6.6 Lushan mainshock using the two-step stochastic EGF method proposed by Kohrs-Sansorny et al. (2005). In this simulation, the source of the Lushan mainshock was s...
Article
Full-text available
An MS6.3 earthquake hit the Kangding County, Sichuan Province on November 22, 2014. Three days later, an MS5.8 aftershock occurred. The source rupture properties of two earthquakes were analyzed and the method for rapidly estimating the source rupture direction was investigated using strong-motion recordings. The grid-search technique was used to s...
Article
Full-text available
The South China Sea is recognized as an area at high risk of tsunamis. The Manila Trench has long been considered as the regional source of tsunamis that might affect Chinese coastal areas, and considerable analysis of the tsunami hazard has been conducted in this area. However, there has been no consideration of other potential local sources near...
Article
The study of failure behavior of a diverse population of cables is challenging. Previous attempts have failed to capture the complexity of cable system failures due to an independent analysis of multiple failure causes or influential factors. In this paper, the multiple correspondence analysis (MCA) is proposed for simultaneous analysis of multiple...
Article
Full-text available
The Mw6.7 Lushan earthquake on April 20, 2013 provided the opportunity to validate the applicability of American Next Generation Attenuation Relationship(NGA-West 1 and NGA-West 2 model). A total of 42 free-field strong-motion recordings within the rupture distance of 200 km were used in this study. Firstly we established an empirical attenuation r...
Article
The different selections of strong ground motion records lead to the discretness of structural dynamic responses. This paper proposes to build a new target spectrum, based on PGA and spectral acceleration attenuation relationship. On the basis of existing strong ground motion record data and according to site conditions, the strong motion records a...
Article
Full-text available
A rational ground motion selection method plays an important role in structure time history analysis, which depends on whether record’s earthquake character is proper. It is often neglected when selecting real strong ground motion for engineering or study, for the design seismic group and design intensity in Chinese seismic code are too ambitious t...
Article
Full-text available
The observed directivity effects of ground motion have extensive implications for both earthquake source physics and earthquake-hazard analyses on active fault zones. In general, it is still difficult to determine the rupture directivity in detail for smaller earthquakes because of limited azimuthal coverage. Four Lushan aftershocks that occurred o...
Article
Full-text available
Site conditions of some strong earthquake stations in China are still unknown, which greatly restrict the effective application of strong earthquake records. A site classification scheme was proposed based on the strong earthquake data from Japanese KiK-net stations according to standard, and the mean site classification curves in China were calcul...
Article
Full-text available
A large number of strong ground motion recordings have been collected by the National Strong-Motion Observation Network System of China in the Lushan earthquake sequences after April 20, 2014. In order to estimate the source parameters of the Lushan aftershocks and the attenuation characteristic of the seismic waves, this study selected 179 acceler...
Article
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The bathymetry data is one of the key inputs in the numerical simulation of tsunami. At present, multiple sources of bathymetry data are available. It needs to clarify whether the differences among these data sources or the data self-errors have an influence on the tsunami numerical simulation. We study the sensitivity of bathymetry data in the num...
Article
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The Ludian County of Yunnan Province in southwestern China was struck by an M S6.5 earthquake on August 3, 2014, which was another destructive event following the M S8.0 Wenchuan earthquake in 2008, M S7.1 Yushu earthquake in 2010, and M S7.0 Lushan earthquake in 2013. National Strong-Motion Observation Network System of China collected 74 strong m...
Article
A method for description of structural characteristics of air traffic situation based on the theory of complex network was proposed. This method characterizes the air traffic situation from three dimensions, including single aircraft, local sector, and overall sector. This work provides a new clue for precise description of air traffic situation co...
Article
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Since the disastrous aftermath of the 2004 Sumatra Tsunami (Indonesia) and the 2011 Tohoku Tsunami (Japan), China has made much effort to mitigate tsunami hazards. We briefly reviewed the progress of cataloguing, modeling, early warning and hazard analysis for tsunamis in China. Compiling a Chinese tsunami catalogue is a challenge at present due to...
Article
INTRODUCTION On 20 April 2013, at 08:02 a.m. Beijing time, a strong earthquake hit Lushan, a county in the southwest of Sichuan Province in China. During this earthquake, a total of 114 strong‐motion stations from the new generation of the National Strong‐Motion Observation Network System (NSMONS) of China were triggered. The NSMONS consists of 11...
Article
Full-text available
The M s7.0 Lushan earthquake on April 20, 2013 is another destructive event in China since the M s8.0 Wenchuan earthquake in 2008 and M s7.1 Yushu earthquake in 2010. A large number of strong motion recordings were accumulated by the National Strong Motion Observation Network System of China. The maximum peak ground acceleration (PGA) at Station 51...
Conference Paper
Full-text available
A Ms7.0 earthquake occurred on April 20, 2013 in Lushan Country, Sichuan Province, China, with the maximum seismic intensity of IX. It caused 196 death, 21 missing and 11470 injured. During the main shock, 114 strong motion recordings were accumulated by the National Strong Motion Observation Network System (NSMONS) of China and 63 recordings by th...