scholarly journals Multivariate Joint Probability Function of Earthquake Ground Motion Prediction Equations Based on Vine Copula Approach

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yin Cheng ◽  
Jun Du ◽  
Hao Ji
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Joint Probability ◽  
Distribution Functions ◽  
Nonlinear Dependence ◽  
Earthquake Ground Motion ◽  
Loss Assessment ◽  
Multiple Parameters ◽  
Vine Copula ◽  
Simple Pair

In the structural earthquake engineering, a single parameter is often not sufficient enough to depict the severity of ground motions, and it is thus necessary to use multiple ones. In this sense, the correlation among multiple parameters is generally considered as an importance issue. The conventional approach for developing the correlation is based on regression analysis, along with simple pair copula approaches proposed in recent years. In this study, an innovative mathematical technique—vine copula—is firstly introduced to develop the empirical model for the multivariate dependence of pseudospectral accelerations (PSAs), which are the most commonly used earthquake ground motion parameters. This advancement not only offers a more flexible way of describing nonlinear dependence among multivariate PSAs from the marginal distribution functions but also highlights the extreme dependence. The results can be conventionally acquired in the ground motion selection and seismic risk and loss assessment based on multivariate parameters.

Design Ground Motion Library: An Interactive Tool for Selecting Earthquake Ground Motions

2015 ◽  
Vol 31 (2) ◽  
pp. 617-635 ◽  
Author(s):  
Gang Wang ◽  
Robert Youngs ◽  
Maurice Power ◽  
Zhihua Li
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Response Spectrum ◽  
Time History ◽  
Earthquake Ground Motion ◽  
Engineering Practice ◽  
Period Range ◽  
Engineering Research ◽  
Interactive Tool ◽  
Design Response Spectrum

The Design Ground Motion Library (DGML) is an interactive tool for selecting earthquake ground motion time histories based on contemporary knowledge and engineering practice. It was created from a ground motion database that consists of 3,182 records from shallow crustal earthquakes in active tectonic regions rotated to fault-normal and fault-parallel directions. The DGML enables users to construct design response spectra based on Next-Generation Attenuation (NGA) relationships, including conditional mean spectra, code spectra, and user-specified spectra. It has the broad capability of searching for time history record sets in the database on the basis of the similarity of a record's response spectral shape to a design response spectrum over a user-defined period range. Selection criteria considering other ground motion characteristics and user needs are also provided. The DGML has been adapted for online application by the Pacific Earthquake Engineering Research Center (PEER) and incorporated as a beta version on the PEER database website.

Sensitivity of the Seismic Response of Long Medieval Walls to Earthquake and Material Uncertainty

2010 ◽  
Vol 133-134 ◽  
pp. 689-695
Author(s):  
Anastasios Sextos ◽  
Kosmas Athanasios Stylianidis ◽  
Konstantinos Mykoniou
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Material Properties ◽  
Selection Process ◽  
Computational Cost ◽  
Sensitivity Analyses ◽  
Earthquake Ground Motion ◽  
Earthquake Excitation ◽  
Variable Nature ◽  
The City

The scope of this paper is to illustrate a strategy for assessing the seismic performance of medieval city walls with emphasis on the Byzantine Walls of the city of Thessaloniki. Despite the relatively simple structural system of such structures, their response under earthquake excitation in 3D space and in the time domain, has not yet been adequately studied primarily due to the lack of efficient numerical tools, the high computational cost associated and the uncertainty related to the spatial variation of material properties and seismic input motion characteristics. Nowadays, the advances in scientific knowledge and the increase in computational power, the ability to efficiently conduct sensitivity analyses and the deeper knowledge of earthquake engineering aspects, provides the opportunity for a more refined simulation and study; however, such approach still remains heavy enough and as such, unsuitable for all practical purposes. Along these lines, a comprehensive computational framework is established and presented herein that aims at quantifying the relative importance of the uncertainty associated with modeling parameters, structural and soil material properties, as well as the earthquake ground motion selection process and application assumptions, the latter refering to the consideration of different angles of incidence of the incoming seismic wavefield and the spatially variable nature of ground motion that excites asynchronously the particularly long historic structures. It is foressen that this detailed 3D dynamic analysis will assist in identifing the relative impact of earthquake characteristics and material properties, permit justified simplifications and facilitate the overall process undertaken by the authors to assess the seismic history of the city of Thessaloniki through a set of detailed back analyses of well-selected parts of the extended wall cirquit.

PEER NGA-East database

2021 ◽  
Vol 37 (1_suppl) ◽  
pp. 1331-1353
Author(s):  
Christine A Goulet ◽  
Tadahiro Kishida ◽  
Timothy D Ancheta ◽  
Chris H Cramer ◽  
Robert B Darragh ◽  
...  
Keyword(s):  
Time Series ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Ground Motions ◽  
Time Windows ◽  
Earthquake Ground Motion ◽  
Engineering Research ◽  
Ground Motion Model ◽  
Stable Continental Region ◽  
Quality Checks

This article documents the earthquake ground motion database developed for the NGA-East Project, initiated as part of the Next Generation Attenuation (NGA) research program and led by the Pacific Earthquake Engineering Research Center (PEER). The project was focused on developing a ground motion characterization model (GMC) model for horizontal ground motions for the large region referred to as Central and Eastern North America (CENA). The CENA region covers most of the U.S. and Canada, from the Rocky Mountains to the Atlantic Ocean and is characterized tectonically as a stable continental region (SCR). The ground-motion database includes the two- and three-component ground-motion recordings from numerous selected events relevant to CENA ( M > 2.5, with distances up to 3500 km) that have been recorded since 1976. The final database contains over 27,000 time series from 82 earthquakes and 1271 recording stations. The ground motion database includes uniformly processed time series, 5% damped pseudo-spectral acceleration (PSA) median-component ordinates for 429 periods ranging from 0.01 to 10 s, duration and Arias intensity in 5% increments, and Fourier amplitude spectra for different time windows. Ground motions and metadata for source, path, and site conditions were subjected to quality checks by topical working groups and the ground-motion model (GMM) developers. The NGA-East database constitutes the largest database of processed recorded ground motions in SRCs and is publicly available from the PEER ground-motion database website.

scholarly journals Seismic rocking effects on a mine tower under induced and natural earthquakes

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Piotr Adam Bońkowski ◽  
Juliusz Kuś ◽  
Zbigniew Zembaty
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Ground Surface ◽  
Tall Buildings ◽  
Earthquake Ground Motion ◽  
Seismic Action ◽  
Seismic Effects ◽  
Copper Ore ◽  
Rotational Components ◽  
Natural Earthquakes

AbstractRecent research in engineering seismology demonstrated that in addition to three translational seismic excitations along x, y and z axes, one should also consider rotational components about these axes when calculating design seismic loads for structures. The objective of this paper is to present the results of a seismic response numerical analysis of a mine tower (also called in the literature a headframe or a pit frame). These structures are used in deep mining on the ground surface to hoist output (e.g. copper ore or coal). The mine towers belong to the tall, slender structures, for which rocking excitations may be important. In the numerical example, a typical steel headframe 64 m high is analysed under two records of simultaneous rocking and horizontal seismic action of an induced mine shock and a natural earthquake. As a result, a complicated interaction of rocking seismic effects with horizontal excitations is observed. The contribution of the rocking component may sometimes reduce the overall seismic response, but in most cases, it substantially increases the seismic response of the analysed headframe. It is concluded that in the analysed case of the 64 m mining tower, the seismic response, including the rocking ground motion effects, may increase up to 31% (for natural earthquake ground motion) or even up to 135% (for mining-induced, rockburst seismic effects). This means that not only in the case of the design of very tall buildings or industrial chimneys but also for specific yet very common structures like mine towers, including the rotational seismic effects may play an important role.

Influences of subsurface geological structure neighboring geological repository on earthquake motion of the site

2009 ◽  
Vol 1193 ◽  
Author(s):  
Taishi Oouchi ◽  
Hiroyuki Tsuchi ◽  
Tetsuya Ota ◽  
Koji Hane ◽  
Toru Sasaki
Keyword(s):  
Ground Motion ◽  
Velocity Structure ◽  
Geological Structure ◽  
Earthquake Ground Motion ◽  
Seismic Motion ◽  
Earthquake Resistant Design ◽  
Geological Repository ◽  
Subsurface Layers ◽  
Deep Underground ◽  
Structural Boundary

AbstractAccording to recent seismic observation records, there are some cases where unexpectedly large seismic motion was observed deep underground and that was larger than at the surface. The factors influencing such phenomena are assumed to be deep geological structures with topographic irregularity, velocity structure and non-linearity of subsurface layers. These factors should be taken into account in the earthquake-resistant design of a geological repository. The influence of a deep underground geological structure with topographic irregularity on ground motion has been studied and it has been confirmed that such a structure have a significant impact on ground motion and the constructive interference of waves may result in strong earthquake ground motion in the vicinity of a structural boundary deep underground.

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