scholarly journals ACCELEROMETRIC NETWORK AND ELASTIC RESPONSE SPECTRUM FOR GROUND TYPE A IN THE REPUBLIC OF SRPSKA

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Snježana Cvijić Amulić ◽  
Sanja Tucikešić
Keyword(s):  
Response Spectrum ◽  
Type A ◽  
Elastic Response ◽  
Eurocode 8 ◽  
Hazard Map ◽  
Ground Acceleration ◽  
Preparation Phase ◽  
The Republic ◽  
Accelerometric Network

This paper presents the content of an analysis of available relevant accelerometric data, which aimsat identifying a group of nationally determined parameters in the field of seismological activity thatwas used in the preparation phase of the B&H national annex for Eurocode 8. Seismological dataanalysis related to parameters that are in Eurocode 8 open to national choice, refer to the: soilclassification, horizontal elastic response spectrum and reference ground acceleration, respectivelyseismic hazard map.

scholarly journals Geo-Characterization at selected accelerometric stations in Crete (Greece) and comparison of earthquake data recordings with EC8 elastic spectra

2014 ◽  
Vol 6 (1) ◽  
Author(s):  
A. Savvaidis ◽  
B. Margaris ◽  
N. Theodoulidis ◽  
V. Lekidis ◽  
Ch. Karakostas ◽  
...  
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Aegean Sea ◽  
Elastic Response ◽  
Seismic Zone ◽  
Ground Acceleration ◽  
Motion Data ◽  
Wave Measurements ◽  
Accelerometric Network ◽  
Almost All

AbstractTo estimate the seismic response according to Eurocode (EC8) and almost all other national codes, site conditions have to be properly characterized so that soil amplification and the corresponding peak ground motion can be calculated.In this work, different geophysical and geotechnical methods are combined in order to define the detailed ground conditions in selected sites of the Hellenic Accelerometric Network (HAN) in Crete. For this purpose, the geological information of the sites and shear wave velocity, calculated from surface wave measurements, is used. Additionally, ground acceleration data recorded through HAN have been utilized from intermediate depth earthquakes in the broader area of South Aegean Sea.Using the recorded ground motion data and the procedure defined in EC8, the corresponding elastic response spectrum is calculated for the selected sites. The resulting information is compared to the values defined in the corresponding EC8 spectrum for the seismic zone that includes the island of Crete.The comparison shows that accurate definition of ground type through geological, geotechnical and geophysical investigations is important. However, our current comparison focuses on the distribution of values rather than the absolute values of EC8-prescribed spectra, and the results should be considered in this context.

Generation of seismic excitations compatible with target spectrum: application to Eurocode 8

2020 ◽  
Vol 18 (1) ◽  
pp. 122-135
Author(s):  
Abdellah Boudina ◽  
Malek Hammoutene
Keyword(s):  
Epicentral Distance ◽  
Response Spectrum ◽  
Ground Motions ◽  
Environmental Parameters ◽  
Eurocode 8 ◽  
Ground Acceleration ◽  
Content Type ◽  
Strong Ground Motions ◽  
Acceleration Time Histories ◽  
Strong Ground

Purpose This paper aims to artificially generate seismic accelerograms compatible with the response spectrum imposed as a function of the given environmental parameters such as magnitude, epicentral distance and type of soil. This study is necessary for the non-linear dynamic analysis of structures in regions where real seismic records are not available. Design/methodology/approach First, a stochastic iterative method is used to estimate the spectral densities of acceleration power from the respective target response spectra. Thereafter, based on the superposition of seismic waves, a subsequent iterative procedure, which implicitly takes into account the non-stationary character of temporal intensity content of strong ground motions, is developed to synthesize, from these power spectral density, the corresponding acceleration time histories. The phase contents of the ground acceleration samples, thus obtained, are generated using a probability density function of phase derivatives with characteristic parameters estimated from seismological considerations. When based on seismic codes spectrum compatible criteria, this procedure can be used to generate strong ground motions for structural design. Findings The results found show that the forms of acceleration of the target and the simulated signals have similar characteristics in terms of strong motion durations, the peak ground acceleration values, corresponding time of occurrence and also, the corresponding cumulative energy functions follow practically the same pattern of variations. Originality/value The aim of this study is to generate seismic accelerograms compatible with regulatory spectra by the composition of the three acceleration duration segments based on environmental parameters (magnitude, epicentral distance and type of soil) and which subsequently serves to control the time envelope of the generated signals, and therefore the random generation of phase derivatives, which has not been previously treated.

scholarly journals Towards improving the seismic hazard map and the response spectrum for the state of RN/Brazil

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Petrus Gorgônio Bulhões da Nóbrega ◽  
Bruno Rammon Silva Souza ◽  
Selma Hissae Shimura da Nóbrega
Keyword(s):  
Seismic Hazard ◽  
Peak Ground Acceleration ◽  
Hazard Analysis ◽  
Response Spectrum ◽  
The State ◽  
Hazard Map ◽  
Intraplate Earthquakes ◽  
Ground Acceleration ◽  
Design Response Spectrum ◽  
Seismic Hazard Map

Abstract Although Brazilian seismic activity is defined as low to moderate, it is known that intraplate earthquakes can also be associated to high intensities. In Brazil, the state of Rio Grande do Norte (RN) is one of the most seismically active areas, but there is no specific study to evaluate the seismic hazard in this region. This paper presents analyses towards improving the seismic hazard map, the peak ground acceleration value and the response spectrum of RN. The methodology is based on Probabilistic Seismic Hazard Analysis, comparing the results to the design criteria defined in the Brazilian code NBR 15421:2006 (Design of seismic resistant structures – Procedure). The analyses show that, in general, the code sets conservative values for the peak ground acceleration and for the design response spectrum; however, related to this last one, the shape is quite different.

scholarly journals Selection of the appropriate methodology for the probabilistic seismic hazard analysis on the territory of the Republic of Serbia

2006 ◽  
Vol 4 (2) ◽  
pp. 101-113
Author(s):  
Borko Bulajic ◽  
Miodrag Manic
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Eurocode 8 ◽  
Probabilistic Seismic Hazard ◽  
Hazard Maps ◽  
Ground Acceleration ◽  
The Republic ◽  
Selection Of

This paper presents a review of the approaches to the probabilistic seismic hazard analysis as well as discussion regarding the selection of the appropriate methodology of probabilistic seismic hazard analysis for the territory of the Republic of Serbia. Use of the deductive approach has been suggested, as well as that the new Serbian seismic hazard maps should be expressed through the values of the peak ground acceleration, having in mind that the new hazard maps for the Republic of Serbia should be compiled in compliance with the recommendations of the Eurocode 8.

Recorded Ground Motion and Estimated Soil Amplification for the 11 May 2011 Lorca Earthquake

2015 ◽  
Vol 31 (4) ◽  
pp. 2301-2323 ◽  
Author(s):  
Myriam Belvaux ◽  
Albert Macau ◽  
Sara Figueras ◽  
Xavier Goula ◽  
Teresa Susagna
Keyword(s):  
Ground Motion ◽  
Site Response ◽  
Ground Motions ◽  
Near Field ◽  
Elastic Response ◽  
Eurocode 8 ◽  
Soil Amplification ◽  
Ground Acceleration ◽  
Geophysical Field ◽  
Elastic Response Spectra

On 11 May 2011 an earthquake of magnitude 5.2 ( M w) hit the Murcia region of Spain causing significant damage to buildings in the town of Lorca. Accelerograms were recorded by stations of the Instituto Geográfico Nacional, and high-amplitude ground motions were observed at the Lorca station, with a peak ground acceleration (PGA) of 0.37 g. The contribution of a near-field component of ground motion is shown in time histories and in elastic response spectra. Features of near-field ground motions such as directivity could have significantly enhanced the ground shaking caused by this event. Local amplification effects in Lorca were investigated by the H/V spectral ratio technique and an array method. Information obtained from the geophysical field survey allowed the definition of representative soil columns and site classifications according to Eurocode 8. Modeling of site response is conducted for an example location. The aftershocks recorded at different sites confirm the soil amplification at these locations.

scholarly journals Simulation of response spectrum-compatible ground motions using wavelet-based multi-resolution analysis

2021 ◽  
pp. 002029402110130
Author(s):  
Guan Chen ◽  
Zhiren Zhu ◽  
Jun Hu
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Ground Motions ◽  
Power Spectra ◽  
Simulation Method ◽  
Eurocode 8 ◽  
Effective Response ◽  
Multi Resolution Analysis ◽  
Resolution Analysis ◽  
Simulated Ground Motions

This study proposed a simple and effective response spectrum-compatible ground motions simulation method to mitigate the scarcity of ground motions on seismic hazard analysis base on wavelet-based multi-resolution analysis. The feasibility of the proposed method is illustrated with two recorded ground motions in El Mayor-Cucapah earthquake. The results show that the proposed method enriches the ground motions exponentially. The simulated ground motions agree well with the attenuation characteristics of seismic ground motion without modulating process. Moreover, the pseudo-acceleration response spectrum error between the recorded ground motion and the average of the simulated ground motions is 5.2%, which fulfills the requirement prescribed in Eurocode 8 for artificially simulated ground motions. Besides, the cumulative power spectra between the simulated and recorded ground motions agree well on both high- and low-frequency regions. Therefore, the proposed method offers a feasible alternative in enriching response spectrum-compatible ground motions, especially on the regions with insufficient ground motions.

scholarly journals Ground accelerations caused by large quarry blasts

1961 ◽  
Vol 51 (2) ◽  
pp. 191-202
Author(s):  
D. E. Hudson ◽  
J. L. Alford ◽  
W. D. Iwan
Keyword(s):  
Response Spectrum ◽  
Strong Motion ◽  
Complete Response ◽  
Charge Weight ◽  
Total Charge ◽  
Ground Acceleration ◽  
Acceleration Time

Abstract Ground acceleration-time measurements have been made within 2000 ft. of two quarry blasts of total charge weight 185 tons and 673 tons. Ground accelerations were of a character and magnitude similar to those associated with damaging earthquakes. Complete response spectrum curves calculated from the acceleration records are presented. Direct comparisons are made between these results and previous similar measuements and calculations using identical instruments, which have been made of strong-motion earthquakes, H. E. blasts, and the Rainier nuclear blast.

scholarly journals Preliminary results of ground-motion characteristics

2012 ◽  
Vol 55 (4) ◽  
Author(s):  
Francesca Bozzoni ◽  
Carlo Giovanni Lai ◽  
Laura Scandella
Keyword(s):  
Ground Motion ◽  
Site Response ◽  
Response Spectrum ◽  
Field Tests ◽  
Response Spectra ◽  
Ground Acceleration ◽  
Preliminary Results ◽  
Emilia Earthquake ◽  
Particle Orbit ◽  
2012 Emilia Earthquake

The preliminary results are presented herein for the engineering applications of the characteristics of the ground motion induced by the May 20, 2012, Emilia earthquake. Shake maps are computed to provide estimates of the spatial distribution of the induced ground motion. The signals recorded at the Mirandola (MRN) station, the closest to the epicenter, have been processed to obtain acceleration, velocity and displacement response spectra. Ground-motion parameters from the MRN recordings are compared with the corresponding estimates from recent ground-motion prediction equations, and with the spectra prescribed by the current Italian Building Code for different return periods. The records from the MRN station are used to plot the particle orbit (hodogram) described by the waveform. The availability of results from geotechnical field tests that were performed at a few sites in the Municipality of Mirandola prior to this earthquake of May 2012 has allowed preliminary assessment of the ground response. The amplification effects at Mirandola are estimated using fully stochastic site-response analyses. The seismic input comprises seven actual records that are compatible with the Italian code-based spectrum that refers to a 475-year return period. The computed acceleration response spectrum and the associated dispersion are compared to the spectra calculated from the recordings of the MRN station. Good agreement is obtained for periods up to 1 s, especially for the peak ground acceleration. For the other periods, the spectral acceleration of the MRN recordings exceeds that of the computed spectra.<br />

scholarly journals Wound botulism in injectors of drugs: upsurge in cases in England during 2004

2005 ◽  
Vol 10 (9) ◽  
pp. 5-6 ◽  
Author(s):  
D Akbulut ◽  
J Dennis ◽  
M Gent ◽  
K A Grant ◽  
V Hope ◽  
...  
Keyword(s):  
Clostridium Botulinum ◽  
Botulinum Neurotoxin ◽  
Type A ◽  
Wound Infections ◽  
Republic Of Ireland ◽  
Wound Botulism ◽  
Geographical Clustering ◽  
The Republic ◽  
The Uk

Wound infections due to Clostridium botulinum were not recognised in the UK and Republic of Ireland before 2000. C. botulinum produces a potent neurotoxin which can cause paralysis and death. In 2000 and 2001, ten cases were clinically recognised, with a further 23 in 2002, 15 in 2003 and 40 cases in 2004. All cases occurred in heroin injectors. Seventy cases occurred in England; the remainder occurred in Scotland (12 cases), Wales (2 cases) and the Republic of Ireland (4 cases). Overall, 40 (45%) of the 88 cases were laboratory confirmed by the detection of botulinum neurotoxin in serum, or by the isolation of C. botulinum from wounds. Of the 40 cases in 2004, 36 occurred in England, and of the 12 that were laboratory confirmed, 10 were due to type A. There was some geographical clustering of the cases during 2004, with most cases occurring in London and in the Yorkshire and Humberside region of northeast England.

scholarly journals Design Earthquake Response Spectrum Affected by Shallow Soil Deposit

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Dong-Kwan Kim ◽  
Hong-Gun Park ◽  
Chang-Guk Sun
Keyword(s):  
Soil Depth ◽  
Site Response ◽  
Response Spectrum ◽  
Soft Soil ◽  
Response Spectra ◽  
Earthquake Response ◽  
Ground Acceleration ◽  
Site Class ◽  
Shallow Soil ◽  
Short Period

Site response analyses were performed to investigate the earthquake response of structures with shallow soil depth conditions in Korea. The analysis parameters included the properties of soft soil deposits at 487 sites, input earthquake accelerations, and peak ground-acceleration levels. The response spectra resulting from numerical analyses were compared with the design response spectra (DRS) specified in the 2015 International Building Code. The results showed that the earthquake motion of shallow soft soil was significantly different from that of deep soft soil, which was the basis of the IBC DRS. The responses of the structures were amplified when their dynamic periods were close to those of the site. In the case of sites with dynamic periods less than 0.4 s, the spectral accelerations of short-period structures were greater than those of the DRS corresponding to the site class specified in IBC 2015. On the basis of these results, a new form of DRS and soil factors are proposed.

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