scholarly journals Seismic vulnerability of structures: application to the Civil Protection building in Andorra

2020 ◽  
Vol 21 (5) ◽  
pp. 514
Author(s):  
Matthias Barus ◽  
Olivier Dalverny ◽  
Hélène Welemane ◽  
Jean-Pierre Faye ◽  
Carmen Martin
Keyword(s):  
Seismic Event ◽  
Seismic Vulnerability ◽  
Natural Frequencies ◽  
Computation Method ◽  
Seismic Events ◽  
Civil Protection ◽  
Structural Behaviour ◽  
Linear Dynamic ◽  
Dynamic Computation ◽  
Interesting Approach

This works deals with the seismic vulnerability of buildings in the Pyrenees mountains region where almost a thousand earthquakes are recorded each year in the border area. The challenge is twofold: first to detect the damage due to seismic events and then to localize it inside studied buildings. Operational Modal Analysis (OMA) coupled with numerical modelling by Finite Element (FE) constitutes an interesting approach to address these issues. Here we intend to apply such methodology on a strategic building located in Andorre-la-Vieille whose structure is complex, irregular and heterogeneous. The structural behaviour of the building is studied through frequency computation method in order to identify its undamaged behaviour. A seismic event is next simulated by a non-linear dynamic computation method which creates damage within the structure. Numerical results (natural frequencies, modal shapes and damage location) allow highlighting damaged zones induced by the earthquake and quantify degradation level in these areas. Accordingly, some guidelines may be given in view of the future instrumentation of the building (accelerometers and RAR).

scholarly journals Seismic vulnerability of dwellings at Sete Cidades Volcano (S. Miguel Island, Azores)

2006 ◽  
Vol 6 (1) ◽  
pp. 41-48 ◽  
Author(s):  
A. Gomes ◽  
J. L. Gaspar ◽  
G. Queiroz
Keyword(s):  
Seismic Event ◽  
Seismic Vulnerability ◽  
Field Survey ◽  
Civil Protection ◽  
Volcanic Origin ◽  
Class A ◽  
Class B ◽  
The Impact ◽  
Human Losses ◽  
Made In

Abstract. Since the settlement of S. Miguel Island (Azores), in the XV century, several earthquakes caused important human losses and severe damages on the island. Sete Cidades Volcano area, located in the westernmost part of the island, was attained by strong seismic crises of tectonic and volcanic origin and major events reached a maximum historical intensity of IX (European Macroseismic Scale 1998) in this zone. Aiming to evaluate the impact of a future major earthquakes, a field survey was carried out in ten parishes of Ponta Delgada County, located on the flanks of Sete Cidades volcano and inside it is caldera. A total of 7019 buildings were identified, being 4351 recognized as dwellings. The total number of inhabitants in the studied area is 11429. In this work, dwellings were classified according to their vulnerability to earthquakes (Classes A to F), using the structure types table of the EMS-98, adapted to the types of constructions made in the Azores. It was concluded that 76% (3306) of the houses belong to Class A, and 17% (740) to Class B, which are the classes of higher vulnerability. If the area is affected by a seismic event with intensity IX it is estimated, that 57% (2480) to 77% (3350) of the dwellings will partially or totally collapse and 15% (652) to 25% (1088) will need to be rehabilitated. In this scenario, considering the average of inhabitants per house for each parish, 82% (9372) to 92% (10515) of the population will be affected. The number of deaths, injured and dislodged people will pose severe problems to the civil protection authorities and will cause social and economic disruption in the entire archipelago.

scholarly journals Seismic Vulnerability Assessment of a Monumental Masonry Building

2020 ◽  
Vol 5 (11) ◽  
pp. 93
Author(s):  
Alessandra De Angelis ◽  
Giuseppe Maddaloni ◽  
Maria Rosaria Pecce
Keyword(s):  
Seismic Behavior ◽  
Seismic Vulnerability ◽  
Nonlinear Static Analysis ◽  
Seismic Events ◽  
Masonry Building ◽  
Singular Case ◽  
Seismic Vulnerability Assessment ◽  
Shell Elements ◽  
Linear Dynamic ◽  
Nonlinear Static

Recent seismic events that hit the central part of Italy have highlighted again the high vulnerability of the historical and architectonical heritage of Italy and the importance of preserving it. However, the seismic assessment of monumental buildings is particularly complex because each historical construction is a singular case realized by specific techniques. Therefore, the first step should be the knowledge of the building even if it is a difficult task. In the present paper, the seismic behavior of an important nineteenth century astronomical observatory, constructed between 1816 and 1819, was investigated. The building, located in Naples, in the southern part of Italy, and classified by the Italian code as an area of medium seismic hazard, was analyzed in the elastic and inelastic range under seismic actions. In this study, the results of two different models were proposed and critically compared. The first one was implemented by shell elements for walls and vaults developing a linear dynamic analysis, while the second one simulates the building through “equivalent frames” applying a nonlinear static analysis.

The Koyna earthquake of December 10 1967: A multiple seismic event

1971 ◽  
Vol 61 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Harsh K. Gupta ◽  
B. K. Rastogi ◽  
Hari Narain
Keyword(s):  
Seismic Event ◽  
Strong Motion ◽  
Seismic Events ◽  
Field Observations ◽  
Rupture Velocity ◽  
P Waves ◽  
Seismic Arrays ◽  
Sine Curve ◽  
Curve Method ◽  
Different Origin

abstract The analysis of P waves recorded at seismological observatories and seismic arrays at teleseismic distances and strong motion seismographs located at Koyna Dam suggest the Koyna earthquake of December 10 1967 to be a complex multiple event. Six of the events could be identified, and the second and third events are located with respect to the initiation using the Gutenberg sine-curve method at distances of 6 and 17 km due south, the average rupture velocity being 3.4 km/sec. The findings are consistent with the field observations and the different origin times, epicenters and magnitudes reported for the earthquake. Seismic array records are found to be very useful in examining the multiplicity of seismic events.

Early Cambrian Seismic Events and Their Tectonic Significance in Western Zhejiang

2012 ◽  
Vol 524-527 ◽  
pp. 42-48
Author(s):  
Fu Sheng Guo ◽  
Zhao Bin Yan ◽  
Liu Qin Chen
Keyword(s):  
Seismic Event ◽  
Regional Distribution ◽  
Sedimentary Rocks ◽  
Seismic Events ◽  
Time Interval ◽  
Early Cambrian ◽  
Distribution Characteristics ◽  
Early Paleozoic ◽  
Tectonic Events ◽  
Tectonic Significance

The two early Cambrian seismic events could be found from sedimentary rocks at Peilingjiao section of Kaihua County, Baishi and Fangcun sections of Changshan County in western Zhejiang, except for Jiangshan area. The seismic event at Baishi outcrop can be correlated to the second seismic event at Peilingjiao section. Taking Fangcun as epicenter of the second seismic event, the magnitude of paleoseism in western Zhejiang is about 7~7.6. According to investigation on regional distribution of seismic events, the two seismic activities should be regulated by large Kaihua-Chun’an fault, but unrelated with Jiangshan-Shaoxing fault or Changshan-Xiaoshan fault. However, the formation time of Kaihua-Chun’an fault has not yet been determinate. Based on controlling on Silurian, the possible formation age was inferred to early Paleozoic. The distribution characteristics of seismites indicate that the Kaihua-Chun’an fault was already being active during early Cambrian and seismic activities may be response to Sinian tectonic events in western Zhejiang. By the way of analysis on paleoseismic rhythm, the time interval of the two seismic events in western Zhejiang is less than 5.0 Ma, which may be the result of early frequent activities of Kaihua-Chun’an fault.

scholarly journals NON-LINEAR DYNAMIC ANALYSIS OF COUPLED SPAR PLATFORM

2013 ◽  
Vol 19 (4) ◽  
pp. 476-491 ◽  
Author(s):  
Mohammed Jameel ◽  
Suhail Ahmad ◽  
A. B. M. Saiful Islam ◽  
Mohd Zamin Zummat
Keyword(s):  
Dynamic Analysis ◽  
Wave Frequency ◽  
Mooring Line ◽  
Wave Loading ◽  
Structural Behaviour ◽  
Offshore Structure ◽  
Spar Platform ◽  
Linear Dynamic ◽  
Long Duration ◽  
Non Linear

Spar platforms are treated as cost-effective and resourceful type of offshore structure in deep water. With increasing depth there are significant changes in its structural behaviour due to coupling of spar hull-mooring line along with radical influence of mooring line damping. So these phenomena should be precisely counted for accurate motion analysis of spar mooring system. In present study, spar platform are configured as a single fully coupled integrated model in ABAQUS/AQUA. Non-linear dynamic analysis in time domain is performed adopting Newmark-β automatic time incrementation technique. Non-linearities due to geometric, loading and boundary conditions are duly considered. Displacement and rotational responses of spar and mooring tensions are obtained during long-duration storm. spar responses get significantly modified and mean position of oscillations gets shifted after longer wave loading. The surge, heave and pitch responses are predominantly excited respectively. The energy contents of PSDs of these responses reduce considerably after long wave loading. Mooring tension responses are significantly different reflecting the damping effect of mooring lines. The pitch response is fairly sensitive to the wave loading duration. After long duration of storm the wave frequency response increases. However, low frequency and wave frequency responses may simultaneously occur due to synchronising sea states.

scholarly journals Reducing the Seismic Vulnerability of Existing Buildings: Assessment and Retrofit

Buildings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 148
Author(s):  
Tiago Miguel Ferreira ◽  
Nuno Mendes ◽  
Rui Silva
Keyword(s):  
Seismic Vulnerability ◽  
Risk Mitigation ◽  
Mitigation Strategies ◽  
Seismic Events ◽  
Existing Buildings ◽  
Seismic Risk Mitigation ◽  
Risk Mitigation Strategies ◽  
Scientific Technical ◽  
Cost Efficient ◽  
Political Communities

Devastating seismic events occurring all over the world keep raising the awareness of the scientific, technical and political communities to the need of identifying assets at risk and developing more effective and cost-efficient seismic risk mitigation strategies [...]

Study on PRA Procedure Considering Combination of Multiple Events Using DQFM Methodology

2018 ◽  
Author(s):  
Hirohisa Yamakawa ◽  
Hitoshi Muta
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Seismic Event ◽  
Seismic Events ◽  
Power Station ◽  
Component Failure ◽  
Multiple Events ◽  
Fukushima Daiichi ◽  
Tsunami Event ◽  
Direct Quantification

Fukushima Daiichi Nuclear Power Station accident occurred by the Great East Japan Earthquake on March 11, 2011. After that, continuous enhancement of nuclear safety is being required in Japan. The accident of Fukushima was caused by the seismic induced tsunami event, namely, multiple events. The other examples of multiple events due to the seismic event are such as internal fire and internal flooding in the nuclear power plants. In addition, structures, such as a building, and piping might be damaged by the seismic event, which could impact component failure dependently. In order to consider these kinds of events, the development of PRA procedures for multiple events caused by the seismic events will be highly demanded. So, we developed a basic PRA methodology for seismic induced tsunami events using “Direct Quantification of Fault Tree using Monte Carlo simulation (DQFM) methodology”. And we verified its applicability through the evaluation.

scholarly journals The Emilia Earthquake: Seismic Performance of Precast Reinforced Concrete Buildings

2014 ◽  
Vol 30 (2) ◽  
pp. 891-912 ◽  
Author(s):  
Gennaro Magliulo ◽  
Marianna Ercolino ◽  
Crescenzo Petrone ◽  
Orsola Coppola ◽  
Gaetano Manfredi
Keyword(s):  
Seismic Performance ◽  
Seismic Event ◽  
Seismic Vulnerability ◽  
Northern Italy ◽  
Epicentral Zone ◽  
Emilia Earthquake ◽  
Cladding Panels ◽  
Precast Structures ◽  
Epicentral Region ◽  
Extensive Damage

On 20 and 29 May 2012, two earthquakes of MW5.9 and MW5.8 occurred in the Emilia region of northern Italy, one of the most developed industrial centers in the country. A complete photographic report collected in the epicentral zone shows the seismic vulnerability of precast structures, the damage to which is mainly caused by connection systems. Indeed, the main recorded damage is either the loss of support of structural horizontal elements, due to the failure of friction beam-to-column and roof-to-beam connections, or the collapse of the cladding panels, due to the failure of the panel-to-structure connections. The damage can be explained by the intensity of the recorded seismic event and by the exclusion of the epicentral region from the seismic areas recognized by the Italian building code up to 2003. Simple considerations related to the recorded acceleration spectra allow motivating the extensive damage due to the loss of support.

scholarly journals MANAGEMENT MODEL WITH PROCESSES TO IDENTIFY SEISMIC VULNERABILITY IN HOUSING

2021 ◽  
Author(s):  
Fabrizio del Carpio Delgado ◽  
◽  
Bertha Silvana Vera Barrios ◽  
Keyword(s):  
Mixed Method ◽  
Confidence Level ◽  
Local Governments ◽  
Seismic Vulnerability ◽  
Management Model ◽  
Economic Losses ◽  
Seismic Events ◽  
Chi Square ◽  
Proposed Model ◽  
Dependence Relationship

Seismic events for decades have caused great prejudice to countries causing human and economic losses due to the collapse of houses, therefore the relevance of this research lies in offering a management model with processes to identify the seismic vulnerabilities of houses and validate the correlation between whether there is dependence between the Knowledge of the Management Model with Processes and its application (hypothesis). A mixed method (quantitative and qualitative) is presented, generating reliable and concise results, issuing Chi-Square values to prove that they are greater than 0.05, implying a very weak or low dependence relationship. Consequently, it is concluded with a confidence level of 95%, indicating the way in which the knowledge of the model is developed and its application, has very little dependence in the local governments of the Moquegua Region, since they do not know the proposed model.

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