Relevant bibliographies by topics / Artificial accelerograms

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Artificial accelerograms'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Artificial accelerograms"

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SIRCA, GENE F., and HOJJAT ADELI. "A NEURAL NETWORK-WAVELET MODEL FOR GENERATING ARTIFICIAL ACCELEROGRAMS." International Journal of Wavelets, Multiresolution and Information Processing 02, no. 03 (2004): 217–35. http://dx.doi.org/10.1142/s0219691304000524.

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In earthquake-resistant design of structures, for certain structural configurations and conditions, it is necessary to use accelerograms for dynamic analysis. Accelerograms are also needed to simulate the effects of earthquakes on a building structure in the laboratory. A new method of generating artificial earthquake accelerograms is presented through adroit integration of neural networks and wavelets. A counterpropagation (CPN) neural network model is developed for generating artificial accelerograms from any given design spectrum such as the International Building Code (IBC) design spectrum. Using the IBC design spectrum as network input means an accelerogram may be generated for any geographic location regardless of whether earthquake records exist for that particular location or not. In order to improve the efficiency of the model, the CPN network is modified with the addition of the wavelet transform as a data compression tool to create a new CPN-wavelet network. The proposed CPN-wavelet model is trained using 20 sets of accelerograms and tested with additional five sets of accelerograms available from the U.S. Geological Survey. Given the limited set of training data, the result is quite remarkable.
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Naumoski, Nove, Murat Saatcioglu, Lan Lin, and Kambiz Amiri-Hormozaki. "Evaluation of the effects of spectrum-compatible seismic excitations on the response of medium-height reinforced concrete frame buildings." Canadian Journal of Civil Engineering 33, no. 10 (2006): 1304–19. http://dx.doi.org/10.1139/l06-085.

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Spectrum-compatible seismic excitations are required when dynamic time-history analysis is used for determining the response of a structure. This paper presents results from a study on the effects of different types of spectrum-compatible excitations on the response of medium-height reinforced concrete frame buildings. Two six-storey buildings designed for Vancouver and a five-storey building designed for Montréal were used in the study. Nonlinear time-history analyses were conducted by subjecting the buildings to selected ensembles of spectrum-compatible excitations (i.e., accelerograms). The ensembles used in the study included spectrum-compatible artificial accelerograms, simulated stochastic accelerograms, and recorded earthquake accelerograms (i.e., real accelerograms) scaled to the design spectrum ordinate at the fundamental building period and to the area under the design spectrum within the predominant period range of the building. The responses of the buildings resulting from spectrum-compatible artificial accelerograms and those from scaled real accelerograms were found to be quite similar. Based on the results of this study, the scaling of real accelerograms to spectral area is preferred for obtaining spectrum-compatible accelerograms.Key words: seismic, excitation, response, spectrum, accelerogram, building, drift, curvature, ductility.
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Zacchei, Enrico, and José Luis Molina. "Damage estimation on concrete gravity dams through artificial accelerograms." MATEC Web of Conferences 211 (2018): 14001. http://dx.doi.org/10.1051/matecconf/201821114001.

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The aim of this paper is to analyse the damage on gravity dams through artificial earthquakes from two methods. The first procedure defines the performance and the response curve of concrete gravity dams using a harmonic function which establishes linear displacements. The other procedure to obtain the artificial earthquake defines the power spectral density function consistent with the response spectrum. This artificial accelerogram is necessary to quantify the response curve of concrete gravity dams in the time domain. The seismic activity in Spain is not frequent, therefore it is often difficult to select real accelerograms to perform a complete seismic analysis, which makes artificial accelerograms extremely useful. Finally, combining these two procedures, a damage index is determined for assessing the crack’s magnitude. These both efficient and practical procedures are useful to develop further complicated analysis.
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Nguyen, Vo Thong, and Manh Hoang. "Establishment of Artificial Accelerogram for Structural Analysis according to the Earthquake Characteristics of Vietnam." Applied Mechanics and Materials 897 (April 2020): 211–20. http://dx.doi.org/10.4028/www.scientific.net/amm.897.211.

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This paper presents the method of establishing artificial accelerogram for analysis and calculation of structures in accordance with seismic characteristics and earthquake risk in one specific construction areas in Vietnam. The artificial accelerogram allow to analyze nonlinear or linear dynamic behavior of the structures in time series in accordance with Vietnam National Standards for Design of structures for earthquake resistances (TCVN 9386: 2012) and seismic parameters specified in Vietnam Building Code on Natural Physical and Climatic Data for Construction (QCVN 02:2009-BXD). The accelerograms are also used as input parameters for shaking table tests by Vietnam's most modern sharking table at the Vietnam Institute for Building Science and Technology.
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Lam, Nelson, John Wilson, and Srikanth Venkatesan. "Accelerograms for Dynamic Analysis under the New Australian Standard for Earthquake Actions." Electronic Journal of Structural Engineering 5 (January 1, 2005): 10–35. http://dx.doi.org/10.56748/ejse.547.

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The new Australian Standard for Earthquake Actions requires buildings exceeding 50 m in height and located in areas with hazard factor of Z ≥ 0.08 (which applies to most capital cities including Canberra, Sydney, Melbourne, Adelaide and Perth) to be designed for earthquake actions based on dynamic analyses. This paper presents a methodology for generating and using artificial accelerograms for obtaining site-specific design response spectra, which could be used for dynamic analyses. This time-history analysis approach of determining earthquake actions can result in more efficient designs in comparison with using response spectra specified by the Standard. An ensemble of accelerograms simulated for both rock and soil conditions are available in an electronic file named: “accelerograms for public access.xls” which can be downloaded free from the journal website for shared usage by all. The accelerogram file also contains listing of the baseline corrected displacement time-histories which are required for input into shaking table experiments and certain seismic simulation programs.
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Menasri, A., M. Brahimi, R. Frank, and A. Bali. "ARMA Modeling of Artificial Accelerograms for Algeria." Applied Mechanics and Materials 105-107 (September 2011): 348–55. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.348.

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The main aim of this study is to examine on the real and simulated earthquakes effects. This paper deals with the use of ARMA models in earthquake engineering. The time-varying auto regressive moving average (ARMA) process is used as a simple yet efficient method for simulating earthquake ground motions. This model is capable of reproducing the nonstationary amplitude as well as the frequency content of the earthquake ground accelerations. The moving time-window technique is applied to synthesize the near field earthquakes, Chlef-1, Chlef-2, Chlef-3 and Attaf 1980 recorded on dense soils in Algeria. This model, is based on a low-order, time-invariant ARMA process excited by Gaussian white noise and amplitude modulated using a simple envelope function to account for the non-stationary characteristics. This simple model gives a reasonable fit to the observed ground motion. It is shown that the selected ARMA (2,1) model and the algorithm used for generating the accelerograms are able to preserve the features of the real earthquake records with different frequency content. In this evaluation, the linear and non linear responses of a given soil layer have been adopted. This study suggests the ability to characterize the earthquake by a minimum number of parameters.
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Vrochidou, Eleni, Petros Alvanitopoulos, Ioannis Andreadis, and Anaxagoras Elenas. "Artificial accelerograms composition based on the CEEMD." Transactions of the Institute of Measurement and Control 40, no. 1 (2016): 239–50. http://dx.doi.org/10.1177/0142331216654533.

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In this work, a new methodology for generating spectrum-compatible accelerograms is presented. The proposed methodology considers the non-stationary and non-linear characteristics of seismic signals and utilizes the Hilbert–Huang transform (HHT) to analyse them. The two reported drawbacks of HHT, i.e. the mode mixing phenomenon and the end effects issue, are resolved through the proposed methodology. More specifically, the advantages of the recently introduced complementary ensemble empirical mode decomposition (CEEMD) are exploited in order to eliminate the mode mixing phenomenon. Moreover, the application of the proposed method only to the strong motion duration of the seismic signal assists to overcome the end effects issue. Thirty natural seismic records of different characteristics, such as frequency content, amplitude and duration, are employed as initial seed signals to demonstrate the proposed method. To illustrate the effectiveness of the proposed technique, comparisons with three established methods for generating spectrum-compatible seismic accelerograms are also provided.
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Vrochidou, E., P. F. Alvanitopoulos, I. Andreadis, A. Elenas, and K. Mallousi. "Synthesis of artificial spectrum-compatible seismic accelerograms." Measurement Science and Technology 25, no. 8 (2014): 085002. http://dx.doi.org/10.1088/0957-0233/25/8/085002.

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Ferrotto, Marco Filippo, Francesco Basone, Panangiotis G. Asteris, and Liborio Cavaleri. "Artificial Ground Motions and Nonlinear Response of RC Structures." Advances in Civil Engineering 2020 (August 30, 2020): 1–14. http://dx.doi.org/10.1155/2020/8849623.

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The selection of seismic inputs for nonlinear dynamic analysis is widely debated, mainly focusing on the advantages and disadvantages provided by the choice of natural, simulated, or artificial records. This work proves the differences in the structural behavior of RC buildings when using accelerograms with different levels of stationarity. Initially, nonlinear response under three sets of accelerograms equivalent in terms of pseudo acceleration spectrum is evaluated and compared. Then, the results of incremental dynamic analyses are compared by the statistical point of view considering different levels of irregularity for the reference structure.
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Lin, Lan, Nove Naumoski, Murat Saatcioglu, Simon Foo, Edmund Booth, and Yuling Gao. "Selection of seismic excitations for nonlinear analysis of reinforced concrete frame buildings." Canadian Journal of Civil Engineering 40, no. 5 (2013): 411–26. http://dx.doi.org/10.1139/l2012-103.

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The selection of seismic motions is one of the most important issues for the time-history analysis of buildings. This paper discusses four different methods for obtaining spectrum-compatible acceleration time histories (i.e., accelerograms) of seismic motions. Based on these methods, four sets of accelerograms compatible with the design spectrum for Vancouver were selected for this study. These included (i) scaled real accelerograms, (ii) modified real accelerograms, (iii) simulated accelerograms, and (iv) artificial accelerograms. The selected sets were used as excitation motions in the nonlinear analysis of three reinforced concrete frame buildings designed for Vancouver. The buildings included a 4-storey, a 10-storey, and a 16-storey building, which can be considered representative of low-rise, medium-rise, and high-rise buildings, respectively. The storey shears, interstorey drifts, and curvature ductilities for beams and columns obtained from the analysis were used for the evaluation of the effects of the selected sets on the responses of the buildings. Based on the results from the analysis, scaled real accelerograms are recommended for use in time-history analysis of reinforced concrete frame buildings.
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Dissertations / Theses on the topic "Artificial accelerograms"

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Brito, Ronnie Chtcot. "Acelerogramas artificiais de sismos aplicados a edificações." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-04012018-102406/.

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Apesar de fortes eventos sísmicos serem raros no Brasil, engenheiros estruturais brasileiros são frequentemente envolvidos em tal análise para os países latino-americanos vizinhos. Informações sobre históricos de aceleração sísmica, de natureza aleatória, não estão em geral disponíveis, devido, em parte, à falta de registros. Para contornar tal situação, os códigos de construção indicam o uso de acelerogramas artificiais, mas não fornecem metodologia para sua obtenção. A informação normalizada é o chamado espectro de resposta elástico, que fornece a aceleração de resposta máxima para um sistema linear de um grau de liberdade. Muitas pesquisas estão sendo desenvolvidas a fim de gerar acelerogramas artificiais compatíveis com os espectros de norma. Assim, neste trabalho se apresenta uma proposta para a geração de acelerograma artificial compatível com espectro de resposta regulamentar. Para exemplo de aplicação, é gerado um acelerograma artificial compatível com a Norma Brasileira NBR 15421: 2006 e aplicado à base de um edifício shear building de dez pavimentos e através de integração numérica por diferenças finitas passo-a-passo no domínio do tempo é calculado o deslocamento do último pavimento deste edifício. De forma semelhante, é gerado um acelerograma artificial compatível com a Norma Venezuelana COVENIN 1756: 2001 e aplicado à base de um reservatório d\'água sobre quatro pilares e estudado o seu comportamento elastoplástico perfeito.<br>Although strong seismic events are rare in Brazil, Brazilian structural engineers are often involved in such an analysis for neighboring Latin American countries. Information on seismic acceleration histories of a random nature is not generally available, due in part to the lack of records. To circumvent such a situation, building codes indicate the use of artificial accelerograms, but do not provide a methodology for obtaining them. The normalized information is the so-called elastic response spectrum, which provides the maximum response acceleration for a linear system of a degree of freedom. Many researches are being developed in order to generate artificial accelerograms compatible with the norm spectra. Thus, this paper presents a proposal for the generation of an artificial accelerogram compatible with a regulatory response spectrum. For an application example, an artificial accelerogram compatible with the Brazilian Standard NBR 15421: 2006 is generated and applied to the base of a ten-story shear building and through numerical integration by finite differences step-by-step in the time domain is calculated the displacement of the last floor of this building. Similarly, an artificial accelerogram is generated that is compatible with the Venezuelan Standard COVENIN 1756: 2001 and applied on the basis of a water reservoir on four pillars and studied its perfect elastoplastic behavior.
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Coronel, Huanca Dennys Luis, and Rojas Marcos Visney Mamani. "Respuesta sísmica de estructuras de concreto armado con un análisis tiempo historia no lineal usando acelerogramas artificiales." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/654933.

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La escasez de registros sísmicos de gran magnitud en algunas regiones del mundo limita la determinación de la respuesta sísmica de una edificación. En este sentido, los acelerogramas artificiales representan una alternativa para definir el evento sísmico porque consideran las condiciones específicas del sitio en estudio. Esta investigación analiza la respuesta sísmica de las estructuras para diversos registros sísmicos artificiales generados de espectros de diseño para distintas condiciones geotécnicas. El procedimiento de análisis empleado será el dinámico tiempo historia no lineal para obtener una mayor precisión en la respuesta sísmica. Los resultados obtenidos muestran que las derivas de entrepiso de las señales artificiales creadas con la función de intensidad de Liu se ajustan mejor a las derivas obtenidas del sismo real escalado.<br>The lack of large seismic records in some world regions limits the determination of the seismic response of a building. For that reason, artificial accelerograms represent an alternative to define the seismic event because they consider specific conditions of study site. This research analyses the structures seismic response for various artificial seismic records generated from design spectra and different geotechnical conditions. Dynamic nonlinear time history analyzing was used to obtain greater precision in the seismic response. The results obtained show that the mezzanine drifts of the artificial signals created with the Liu intensity function better fit the drifts obtained from the scaled real earthquake.<br>Trabajo de investigación
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GENOVESE, Federica. "Generation of time and frequency dependent random processes compatible with recorded seismic accelerograms." Doctoral thesis, 2021. http://hdl.handle.net/11570/3212614.

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Strong earthquakes, caused by a sudden release of stress along faults in the earth's crust, are among the most damaging and deadly natural phenomena. The energy released by an earthquake travels in the form of waves, known as seismic waves. When the seismic waves reach the ground surface, the produced shaking induces dynamic effects on structural and geotechnical systems that can severely compromise their safety level and stability. The induced dynamic action at a given site depends on several factors such as: the strength, and duration of shaking and the mechanical properties of the soil layers crossed by the seismic waves. The knowledge of ground motion attributable to earthquakes is essential for the design of earthquake-resistant structures, and the evaluation of the seismic vulnerability of existing ones. Among all possible sources of uncertainty stemming from the structural and soil material properties, the selection of the earthquake-induced ground motions has the highest effect on the variability observed in the response history analysis of structures and geotechnical systems. The characteristics of the design ground motion, representing the level of shaking for which satisfactory performance is expected, are influenced by the characteristics of seismic source, the rupture process, the source-site travel path, the local site conditions, and the importance of the structure or facility for which the ground motion is to be used. When the local, geologic and tectonic conditions of the site of interest is similar to those of sites where actual strong motions have previously been detected, the recorded time histories can be used directly as input motions in the dynamic analyses. Otherwise, the use of artificial accelerograms, having characteristics consistent with those of actual earthquakes, could represent a valid alternative. However, the generation of artificial accelerograms might not be easy: many motions that appear reasonable in the time domain may not be so when examined in the frequency domain, and vice versa. Furthermore, many reasonable-looking time histories of acceleration produce, after integration, unreasonable time histories of velocity and/or displacement. The main aim of this Ph.D. thesis is to propose two novel procedures for the generation of artificial accelerograms having the same time and frequency contents of recorded time histories. The purpose of the Chapter 1 is to illustrate the basic concepts of seismic engineering that may be useful in reading this thesis. Specifically, this Chapter describes the recording instruments used to detect strong ground motion and the signals processing techniques by which measured motions are corrected. Finally, a brief overview of the main intensity measures that can be used to characterize the amplitude, frequency content and duration of strong ground motions, is presented. Chapter 2 highlights the limitations of the classical Fourier analysis in describing non-stationary signals whose statistical parameters vary with time. Therefore, an introduction to joint time-frequency signal representation through the short time Fourier transform and the wavelet transform, is presented. More details will be given about a particular kind of harmonic wavelet, called “circular”, and the related theory. In Chapter 3, after a brief introduction on stochastic variables and processes, the discrete circular wavelet transform is proposed to randomly generate an arbitrary number of records with the same non-stationary characteristics of the target accelerogram. The influence of a novel correlation structure for the definition of the wavelet random phases and a different subdivision of the earthquake record in frequency bands are highlighted and discussed. Through the proposed stochastic generation method, an effective trade-off is identified between localisation in the frequency domain and in the time domain of the generated signals. In Chapter 4, a novel method for generating samples of a fully non-stationary zero-mean Gaussian process, having a target acceleration time-history as one of its own samples, is described. The evolutionary power spectral density (EPSD) function of the proposed fully non-stationary model is evaluated as the sum of uniformly modulated processes. These are defined in each time interval, as the product of deterministic modulating functions per stationary zero-mean Gaussian sub-processes, whose unimodal power spectral density (PSD) functions are filtered by high pass and low pass Butterworth filters. In each time interval the parameters of the modulating functions are estimated by least-square fitting the expected energy of the proposed model to the energy of the target accelerogram, while the parameters of the PSD functions of stationary sub-processes are estimated once both occurrences of peaks and zero-level up-crossings of the target accelerogram, in the various intervals, are counted. Chapter 4 concludes with the application of an iterative procedure aimed to obtain the compatibility between the mean spectrum of the generated samples and a target one. Depending on the aim to be achieved, it is possible to obtain the spectrum-compatibility in terms of response spectrum or Fourier spectrum, using two different corrective PSD function terms. In Chapter 5, a new approach which takes into account the inherent random nature of the ground motion acceleration as well as epistemic uncertainties affecting the definition of its power spectrum, is presented. Specifically, seismic excitation is modelled as a zero-mean stationary Gaussian random process fully characterized by an imprecise PSD function, i.e. with interval parameters. The ranges of such interval parameters are determined by analysing a large set of accelerograms recorded on rigid soil deposits. To discard outliers, the Chauvenet’s Criterion is applied iteratively. The proposed imprecise PSD function may be viewed as representative of the actual accelerograms recorded on rigid soil deposits. Due to imprecision of the excitation, the fractile of order p of the structural response turn out to have an interval nature. The bounds of the fractile order p are here used to define the range of structural performance. In this Ph.D. thesis, several numerical applications will be done in order to test the effectiveness of the proposed procedures.
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Book chapters on the topic "Artificial accelerograms"

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Vrochidou, Eleni, Petros Alvanitopoulos, Ioannis Andreadis, Anaxagoras Elenas, and Katerina Mallousi. "HHT-Based Artificial Seismic Accelerograms Generation." In Progress in Pattern Recognition, Image Analysis, Computer Vision, and Applications. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-662-44654-6_47.

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Sridharan, Aadityan, and Sundararaman Gopalan. "Seismic Data Analytics for Estimating Seismic Landslide Hazard Using Artificial Accelerograms." In Machine Learning and Information Processing. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4859-2_56.

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Muscolino, Giuseppe, and Tiziana Alderucci. "Seismic Analysis of Structural Systems Subjected to Fully Non-stationary Artificial Accelerograms." In Computational Methods in Applied Sciences. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47798-5_4.

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Lapin, Vladimir, Syrymgali Yerzhanov, and Nurakhmet Makish. "Method for Generating Artificial Accelerograms of Regional Earthquakes for Calculating Buildings and Structures." In XIV International Scientific Conference “INTERAGROMASH 2021”. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80946-1_23.

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Nguyen-Vo, T., T. Do-Tien, and K. Nguyen-Trung. "Establishment of Artificial Accelerogram for Shaking Table Test." In Proceedings of the International Conference on Advances in Computational Mechanics 2017. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7149-2_41.

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Abdalla, J. A., and Y. M. Hag-Elhassan. "The simulation of earthquake ground motion for the generation of artificial accelerograms." In Earthquake Ground Motion. WIT Press, 2014. http://dx.doi.org/10.2495/978-1-84566-000-0/012.

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Conference papers on the topic "Artificial accelerograms"

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Genovese, Federica, Giuseppe Muscolino, Giovanni Biondi, and Ernesto Cascone. "GENERATION OF ARTIFICIAL ACCELEROGRAMS CONSISTENT WITH EARTHQUAKE-INDUCED GROUND MOTIONS." In XI International Conference on Structural Dynamics. EASD, 2020. http://dx.doi.org/10.47964/1120.9247.21495.

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Rashidi, S., M. A. Saadeghvaziri, and R. Navalurkar. "Seismic Analysis of Steel Frames Using Spectral-Representation-Based Artificial Accelerograms." In Structures Congress 2005. American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40753(171)190.

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Nardin, Chiara, Igor Lanese, Rocco di Filippo, Roberto Endrizzi, Oreste S. Bursi, and Fabrizio Paolacci. "Ground Motion Model for Seismic Vulnerability Assessment of Prototype Industrial Plants." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21190.

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Abstract Relationships between seismic action, system response and relevant damage levels in industrial plants require a solid background both in experimental data, due to the high level of non-linearity and seismic input. Besides, risk and fragility analyses depend on the adoption of a huge number of seismic records usually not available in a site-specific analysis. In order to manage these issues and to gain knowledge on the definition of damage levels, limit states and performance for major-hazard industrial plant components, we present a possible approach for an experimental campaign based on a real prototype industrial steel structure. The investigation of the seismic behaviour of the reference structure will be carried out through shaking table tests. In particular, tests are focused on structural or process-related interactions that can lead to serious secondary damages as leakage in piping systems or connections with tanks and cabinets. The aforementioned test program has been possible thanks to the adoption of: i) a number of artificial spectrum-compatible accelerograms; ii) a ground motion model (GMM) able to generate a suite of synthetic time-histories records for specified site characteristic and earthquake scenarios. More precisely, GMM model parameters can be identified by matching the statistics of a target-recorded accelerogram to the ones of the model in terms of faulting mechanism, earthquake magnitude, source-to-site distance and site shear-wave velocity. As a result, the stochastic model, based both on these matched parameters and on filtered white-noise process, can generate the ensemble of synthetic ground motions capable of capturing the main features of real earthquake ground motions, including intensity, duration, spectral content and peak values. Moreover, the synthetic records are selected to target specific damages and limit states in industrial components. Finally, by means of the combination of artificial and synthetic accelerograms, a seismic vulnerability assessment of both the whole structure and relevant industrial components can be carried out.
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Genovese, Federica, Giuseppe Muscolino, G. Biondi, and E. Cascone. "A NOVEL METHOD FOR THE GENERATION OF FULLY NON-STATIONARY SPECTRUM COMPATIBLE ARTIFICIAL ACCELEROGRAMS." In 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Institute of Structural Analysis and Antiseismic Research National Technical University of Athens, 2021. http://dx.doi.org/10.7712/120121.8571.19448.

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Cacciola, Pierfrancesco, and Irmela Zentner. "Generation of Artificial Earthquake Accelerograms Compatible with Mean and Mean ± Standard Deviation Response Spectra." In 6th International Conference on Computational Stochastic Mechanics. Research Publishing Services, 2011. http://dx.doi.org/10.3850/978-981-08-7619-7_p014.

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Dubyk, Yaroslav, and Vitalii Antonchenko. "Seismic Analysis of VVER-1000 Polar Crane." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-61706.

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Abstract This article discuss an analytical dynamic model of a polar crane to assess its seismic strength based on artificially generated accelerograms. The polar crane is installed under the dome of the VVER-1000 NPP containment and serves to move various cargoes in the reactor compartment, including nuclear hazardous cargo. The high-rise location of the crane (+ 55m) causes the possibility of significant seismic loads. To build a dynamic model, at the beginning, the stiffness of individual elements was analyzed using numerical and analytical methods. In particular, the stiffnesses of the main beams and the main balancers are analyzed to determine the type of dynamic model required. A feature of the seismic analysis of a polar crane is the nonlinear interaction of its elements, which can lead to the breaking of some connections and the separation of the structure from the supporting elements. The key in the analysis is taking into account the contact nonlinearity of the wheel-rail pair; to model this contact, we used the classical theory of Hertz. The generalized response spectra for the NPP site were used as the load. A method for calculating artificial accelerograms, which are generated for the purposes of dynamic analysis, based on response spectra is used. Also, as a comparison, the results of calculating the seismic strength of the polar crane by the linear response spectrum method are given. As a result of the analysis, weak points in the structure were identified, and the ultimate seismic resistance of the polar crane was determined.
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di Filippo, Rocco, Giuseppe Abbiati, Osman Sayginer, Patrick Covi, Oreste S. Bursi, and Fabrizio Paolacci. "Numerical Surrogate Model of a Coupled Tank-Piping System for Seismic Fragility Analysis With Synthetic Ground Motions." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93685.

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Abstract Seismic risk evaluation of coupled systems of industrial plants often needs the implementation of complex finite element models to consider their multicomponent nature. These models typically rely on significant computational resources. Moreover, the relationships between seismic action, system response and relevant damage levels are often characterized by a high level of nonlinearity, thus requiring a solid background of experimental data. Furthermore, fragility analyses depend on the adoption of a significant number of seismic waveforms generally not available when the analysis is site-specific. To propose a methodology able to manage these issues, we present a possible approach for a seismic reliability analysis of a coupled tank-piping system. The novelty of this approach lies in the adoption of artificial accelerograms, FE models and experimental hybrid simulations to evaluate a surrogate meta-model of our system. First, to obtain the necessary input for a stochastic ground motion model able to generate synthetic ground motions, a disaggregation analysis of the seismic hazard is performed. Hereafter, we reduce the space of parameters of the stochastic ground motion model by means of a global sensitivity analysis upon the seismic response of our system. Hence, we generate a large set of synthetic ground motions and select, among them, a few signals for experimental hybrid simulations. In detail, the hybrid simulator is composed by a numerical substructure to predict the sliding response of a steel tank, and a physical substructure made of a realistic piping network. Furthermore, we use these experimental results to calibrate a refined ANSYS FEM. More precisely, we focus on tensile hoop strains in elbow pipes as a leading cause for leakage, monitoring them with strain gauges. Thus, we present the procedure to evaluate a numerical Kriging meta-model of the coupled system based on both experimental and finite element model results. This model will be adopted in a future development to carry out a seismic fragility analysis.
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Brito, Ronnie Chtcot, and Reyolando M. L. R. F. Brasil. "DETERMINATION OF AN ARTIFICIAL BASE ACCELEROGRAM COMPATIBLE WITH A NATIONAL BUILDING CODE FOR SEISMIC RESISTANT BUILDINGS." In XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering. ABMEC Brazilian Association of Computational Methods in Engineering, 2017. http://dx.doi.org/10.20906/cps/cilamce2017-0073.

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Brasil, Reyolando, and Ronnie Brito. "DETERMINATION OF AN ARTIFICIAL BASE ACCELEROGRAM COMPATIBLE WITH A NATIONAL CODE FOR SEISMIC ANALYSIS OF A SHEAR BUILDING MODEL." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-0243.

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