• Title/Summary/Keyword: Seismicity

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Example of the Structural Design with Applied SNiP codes in the Commonwealth of Independent States (CIS) (CIS 국가 내진 설계 방법과 SNiP Code를 적용한 주거시설 구조설계 사례)

  • Lee, Dong-Woo;Kwak, Chul-Seung;Jeong, Hoon-Sik
    • Proceeding of KASS Symposium
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    • 2008.05a
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    • pp.232-237
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    • 2008
  • In the Commonwealth of Independent States (CIS), the international organization, or alliance, consisting of eleven former Soviet Republics, their own regulation and standard, codes of the building are based on SNiP issued from the Russia. The SNiP for the seismicity is based on Kazakhstan codes where earthquake is very strong. After their independence, Seismic codes for Former Soviet Republics have been developed in their own accord. The building subjected by more than certain magnitude should be followed by TU as well as SNiP. In this paper, the residential complex project where seismic stability is considered from schematic design will be introduced. In this project, Local analysis program and method for arrangement of bar was applied. In the structural drawings, Korean and Local methods was compromised.

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Seismic Performance of High-rise Concrete Buildings in Chile

  • Lagos, Rene;Kupfer, Marianne;Lindenberg, Jorge;Bonelli, Patricio;Saragoni, Rodolfo;Guendelman, Tomas;Massone, Leonardo;Boroschek, Ruben;Yanez, Fernando
    • International Journal of High-Rise Buildings
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    • v.1 no.3
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    • pp.181-194
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    • 2012
  • Chile is characterized by the largest seismicity in the world which produces strong earthquakes every $83{\pm}9years$ in the Central part of Chile, where it is located Santiago, the capital of Chile. The short interval between large earthquakes magnitude 8.5 has conditioned the Chilean seismic design practice to achieve almost operational performance level, despite the fact that the Chilean Code declares a scope of life safe performance level. Several Indexes have been widely used throughout the years in Chile to evaluate the structural characteristics of concrete buildings, with the intent to find a correlation between general structural conception and successful seismic performance. The Indexes presented are related only to global response of buildings under earthquake loads and not to the behavior or design of individual elements. A correlation between displacement demand and seismic structural damage is presented, using the index $H_o/T$ and the concrete compressive strain ${\varepsilon}_c$. Also the Chilean seismic design codes pre and post 2010 Maule earthquake are reviewed and the practice in seismic design vs Performance Based Design is presented. Performance Based Design procedures are not included in the Chilean seismic design code for buildings, nevertheless the earthquake experience has shown that the response of the Chilean buildings has been close to operational. This can be attributed to the fact that the drift of most engineered buildings designed in accordance with the Chilean practice falls below 0.5%. It is also known by experience that for frequent and even occasional earthquakes, buildings responded elastically and thus with "fully operational" performance. Taking the above into account, it can be said that, although the "basic objective" of the Chilean code is similar to the SEAOC VISION2000 criteria, the actual performance for normal buildings is closer to the "Essential/Hazardous objective".

A Study on the Criteria for the Earthquake Safety Evaluation of Fill Dams (필댐의 내진 성능 평가 기준에 대한 고찰)

  • Choo, Yun-Wook;Lee, Sei-Hyun;Kim, Mu-Kwang;Kim, Dong-Soo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.15 no.6
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    • pp.19-31
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    • 2011
  • The current Korean criteria for seismic performance evaluated by dynamic analysis regulates that the horizontal displacement and vertical settlement of a dam body, including the static deformation, should be within 1% of the dam height. However, there has been weak theoretical support, so that the current criteria have to be validated. Korea is in a region of low or moderate seismicity located inside the Eurasian plate, and few earthquakes with considerable magnitudes and intensities have been recorded in the area. Therefore, in this study, published data measured in overseas countries were collected in order to construct a database and validate the current criteria. In addition, dynamic centrifuge tests and a parametric study using numerical simulations were performed in order to investigate the effect on the horizontal displacement and settlement of a dam body and to validate the current criteria.

A Study on the Best Estimate of Seismicity Parameter b-Value and Its Application for the Seismic Hazard Analysis of the Korean Peninsula (한반도의 최적 지진원 변수 b값 및 그의 적용에 관한 연구)

  • Seo, Jeong-Moon;Rhee, Hyun-Me;Choi, In-Kil
    • Journal of the Earthquake Engineering Society of Korea
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    • v.14 no.1
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    • pp.35-42
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    • 2010
  • The best estimate Gutenberg-Richter b-value of the Korean Peninsula was estimated through an expert panel assigned to evaluate the currently available study results. The panel's assessment yielded that the Gutenberg-Richter b-value was relatively constant over the Korean Peninsula and was independent of seismic zones with an average value of 0.96. Also, the currently most reliable four seismotechtonic structural maps were produced. The effects on the seismic hazard were analyzed by applying the results to the Shinwuljin Units 1&2 NPP site. As a result, the mean hazard level at 0.2g was decreased by about 70-80% (on the order of 0.6-0.7), and the uncertainty band at 0.2g for the reliability band of 15%-85% was significantly reduced. It was proposed, for conservatism, to use b=0.95 over all seismic zones for seismic hazard analysis in the future.

Approach to the Earthquake Prediction by Analyzing Foreshocks of Large Korean Historical Earthquakes (역사지진에서 강진의 전진에 대한 특성 분석을 통한 지진 예지에 대한 고찰)

  • E, Sang-Hion;Lee, Kie-Hwa
    • Journal of the Korean Geophysical Society
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    • v.8 no.3
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    • pp.115-121
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    • 2005
  • Seismicity changes associated with foreshocks of large Korean historical earthquakes of MMI > VIII are investigated for earthquake prediction study. A number of tests showed that b-values of foreshocks associated with these large earthquakes are most stable for precursor period of 13 years before the earthquake and rectangular source area of 1.1o by 1.1o around the epicenter. The b-values of foreshocks for 11 large events of MMI > VIII for the above foreshock area and precursor period turns out to be smaller than the value of 0.36 for the whole historical earthquakes with average 0.27. Epicenters of these foreshocks of small b-values are distributed close to the location of the main large earthquake. These observations indicate a possibility of predicting large earthquakes by closely monitoring the change of b-value for an extended period over decades in the Korean peninsula.

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Near-surface geophysical studies in the Ulsan Fault Zone of Korea (한국 울산단층대에서의 천부지구물리 연구)

  • Kim, Ki-Young;Kim, Dong-Hoon;Lee, So-Young
    • Geophysics and Geophysical Exploration
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    • v.11 no.1
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    • pp.78-84
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    • 2008
  • Recent earthquakes near nuclear power plants in Korea have triggered public concerns about possible seismicity of the Ulsan Fault Zone in the south-eastern part of the Korean peninsula. To reveal subsurface structures of this fault zone, we conducted high-resolution seismic refraction and reflection surveys, and closely spaced gravity measurements in the Dongchon River valley north of Ulsan, Korea. Here alluvium covers the north-south trending fault zone in a 1-km wide valley. Both source points and receivers were spaced at 5-m intervals for the 24-channel seismic refraction and reflection methods, along two profiles of 835 m and 415 m length. Gravity data were also measured along these profiles at 131 stations using a 10-m interval. Synergetic interpretation of seismic refraction, high-resolution seismic reflection, and gravity surveys across the valley indicates that the Ulsan Fault Zone was formed by apparent north-south strike-slip motions during the Cretaceous, and that some faults may have been reactivated by east-west compressional or transpressional stresses during the Tertiary or Quaternary.

Study on Earthquakes of Korea based on the Local Data of 1926~1943 (1926~1943년(年)의 국지자료(局地資料)에 의한 한국 지진(地震)의 연구(硏究))

  • Kim, Sang Jo
    • Economic and Environmental Geology
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    • v.13 no.1
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    • pp.1-19
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    • 1980
  • The local earthquake data, observed by Wiechert seismograph in Korea during Feb. 1926-May 1943, was provided and investigated. Using S-P monogram of JMA, mainly Tsuboi's formula and additional intensity data, the earthquake parameters are obtained as much as possible within a reasonable discrepancy. The seismic characteristics as to the epicenter distribution was discussed under the viewpoint of its relation to the adjacent geologic structure. Some statistical results are analyzed comparing with Kyushu region which provide a reasonable interpretation on the seismicity of Korea. By superposing the available information of the individual events, the general trend of stress field was found to be east-west compression, which mostly agree with that of the southwestern Japan.

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Construction of Earthquake Disaster Management System Based on Seismic Performance Evaluation of Architectural Structure (건축물 내진성능평가에 의한 지진재해관리정보체계 구축)

  • Kim, Seong-Sam;Cho, Eun-Rae;Yoon, Jeong-Bae;Yoo, Hwan-Hee
    • Journal of Korean Society for Geospatial Information Science
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    • v.15 no.3
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    • pp.59-67
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    • 2007
  • This paper proposes potentialities of constructing the information system for earthquake hazard management which can manage and analyse earthquake risk and hazard systematically. The experimental results as well as architectural structure investment data for seismicity assessment are built in database and connected with GIS for assessing earthquake safety of building in urban area. For earthquake-resistant performance assessment, we collected and classified building structural data according to assessment criteria using building register, architectural map, digital map, and then complemented database with field survey data. We also suggest GIS-based information system can cope with and manage earthquake hazard effectively, as evaluating earthquake risk by performing detailed earthquake-resistant assessment and determining final assessment scores. The assessment should be processed quickly and accurately by integrating the earthquake hazard information management system with modularization of assessment procedure and method in the future.

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A Way for Establishing Tsunami Scenario Data Base (지진해일 시나리오 DB 구축방안)

  • Lee, Duk-Kee;Ryoo, Yong-Gyu;Yang, Jun-Mo;Kim, Su-Kyung;Youn, Young-Hoon;Lee, Jun-Hee;Park, Jong-Chan
    • Journal of the Korean Geophysical Society
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    • v.8 no.2
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    • pp.93-96
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    • 2005
  • Focal mechanism of the real and imaginary faults in the western coast of Japan has been assumed by examining the previous studies on the seismicity, seismic gap, fault behaviors, seismic zoning, and faults. In the area of no seismic information, the focal mechanism has been assumed to have the maximum influence on the tsunami height in the eastern coast of Korea. The tsunami height in a particular point of the eastern coast of Korea can vary up to 7 orders with the variation of the strike of the fault in a particular source point of the western coast of Japan with constant magnitude. Tsunami scenario DB including the arrival times and tsunami heights has been constructing by using the assumed focal mechanism of the western coast of Japan. Tsunami warning system will be reinforced by using this tsunami scenario DB near future.

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Hysteresis Characteristics of Buckling Restrained Brace with Precast RC Restraining Elements (조립형 프리캐스트 콘크리트 보강재를 가지는 비좌굴가새의 이력특성)

  • Shin, Seung-Hoon;Oh, Sang-Hoon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.1
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    • pp.72-84
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    • 2016
  • The conventional brace system is generally accepted as the lateral load resisting system for steel structures due to efficient story drift control and economic feasibility. But lateral stiffness of the structure decreases when buckling happens to the brace in compression, so that it results in unstable structure with unstable hysteresis behavior through strength deterioration. Buckling restrained brace(BRB) system, in which steel core is confined by mortar/concrete-filled tube, represents stable behavior in the post-yield range because the core's buckling is restrained. So, seismic performance of BRB is much better than that of conventional brace system in point of energy absorption capacity, and it is applied the most in high seismicity regions as damper element. BRBs with various shaped-sections have been developed across the globe, but the shapes experimented in Korea are now quite limited. In this study, we considered built-up type of restraining member made up of precast reinforcement concrete and the steel core. we experimented the BRB according to AISC(2005) and evaluated seismic performances and hysteresis characteristics.