• Title, Summary, Keyword: earthquake resistance

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An Experimental Study on the Liquefaction Resistance Strength Using Real Earthquake Loadings Considering Seismic Magnitude in Moderate Earthquake Region (실지진하중을 이용한 중진지역에서의 액상화 저항강도에 관한 실험적 연구)

  • 김수일;최재순;박성용;박근보;심재욱
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.569-576
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    • 2003
  • Based on the equivalent uniform stress concept Presented by Seed and Idriss, sinusoidal cyclic loads which simplified earthquake loads have been applied in evaluating the liquefaction resistance strength experimentally. However, the liquefaction resistance strength of soil based on the equivalent uniform stress concept can not exactly reflect the dynamic characteristics of the irregular earthquake motion. The liquefaction assessment method which was invented by using the equivalent uniform stress concept is suitable for the severe earthquake region such as Japan or USA, so the proper method to Korea is needed. In this study, estimation of the resistance to liquefaction was conducted by applying real earthquake loading to the cyclic triaxial test. From the test results, the characteristics of the fine sand under moderate earthquake were analyzed and compared with the results under strong earthquakes. Typically real earthquake loads used in this study are divided into two types - impact type and vibration type. Furthermore, results of the liquefaction resistance strength based on the equivalent uniform stress concept and tile concept using real earthquake loading were compared.

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Evaluation of Liquefaction Resistance Strength based on the Cyclic Triaxial Tests using Real Earthquake Loading (실지진하중의 진동삼축시험에 기초한 액상화 저항강도 산정)

  • 심재욱;김수일;최재순;박근보
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.67-74
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    • 2002
  • An experimental assessment on the dynamic behavior of saturated sand which can consider the irregular characteristics of earthquakes was proposed. The equivalent uniform stress concept presented by Seed and Idriss has been applied to evaluate the liquefaction resistance strength to simplify earthquake loading. However, it was known that the liquefaction resistance strength of soil based on the equivalent uniform stress concept can't exactly mirror the dynamic characteristics of the irregular earthquake motion. In this study, estimation of the criterion of the liquefaction resistance strength was determined by applying real earthquake loading to the cyclic triaxial test. From the test results, relationships between excess pore water pressure and the earthquake characteristics such as magnitude or duration were determined. Magnitude scaling factors to determine the soil liquefaction resistance strength in seismic design were also proposed.

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Review for Main Contents of Earthquake Resistance Design Regulations for Subway Structures (도시철도 내진설계기준 주요 내용 검토)

  • Yoo, Je-Nam;Lee, Sung-Min
    • Proceedings of the KSR Conference
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    • pp.468-474
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    • 2005
  • Recently 'Earthquake Resistance Design Regulations for Subway structures' has been established. It is the first time in our country. In this paper the regulations is reviewed and expalined briefly. Contents for the Performance Based Design Critetia and the estimation method for the design earthquake reponse spectrum in underground structures are reviewed. Earthquake resistance design for the evaluation of liquifaction, boundary spring coefficients for structural analysis modelling and soil response displacements are investigated and described also. Earthquake resitance design details shall be explained.

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Basic Design for Earthquake Resistance of Typical Bridges (일반교량의 내진성능 확보를 위한 기본설계)

  • Kook, Seung-Kyu
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.1
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    • pp.49-57
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    • 2013
  • Structural elements of typical bridges are superstructure, connections, substuctures and foundations and earthquake resistance is decided with the failure mechanism formed by substuctures and connections. Therefore earthquake resistant design should be carried out in the basic design step where design strengths, e.g. design sections for structural elements are determined. The Earthquake Resistant Design Part of Korean Roadway Bridge Design Code provides two basic design procedures. The first conventional procedure applies the Code-provided response modification factors. The second new procedure is the ductility-based earthquake resistant design, where designer can determine the response modification factors. In this study, basic designs including the two design processes are carried out for a typical bridge and supplements are identified in view of providing earthquake resistance.

Calculation of Seismic Capacity Evaluation Index of Shear Wall System (전단벽 구조시스템의 내진성능평가 지표 산정)

  • Park, Tae-Won;Na, Seong-Uk;Woo, Woon-Taek;Chung, Lan
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.223-230
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    • 2002
  • Earthquake resistance design has been developed many countries like Japan, USA, Mexico, New Zealand etc., which countries have experienced many earthquakes. Nowadays, earthquake resistance design has come into worldwide use. In Korea, the seismic design regulations have been established since 1988 in order to minimize the economic losses. Recently performance based design method has been adopted as a new Earthquake resistance design method. These regulations, however, are targeted for newly constructed buildings, In Korea, there are no regulations for existing buildings that built before 1988. On the other hand, in Japan and USA, the seismic performance evaluation is coded. In Japan, the evaluation index which can measure seismic performance has been made. So, we need to prepare the regulations that evaluate the seismic performance, furthermore proper retrofitting design guideline needs to be proposed when remodeling old buildings. In this research, various seismic performance evaluation methods which are being used in Japan and USA are reviewed in order to establish seismic performance evaluation index for those existing old structures in Korea.

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Fire-after-earthquake resistance of steel structures using rotational capacity limits

  • Pantousa, Daphne;Mistakidis, Euripidis
    • Earthquakes and Structures
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    • v.10 no.4
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    • pp.867-891
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    • 2016
  • This paper addresses numerically the behavior of steel structures under Fire-after-Earthquake (FAE) loading. The study is focused on a four-storey library building and takes into account the damage that is induced in structural members due to earthquake. The basic objective is the assessment of both the fire-behavior and the fire-resistance of the structure in the case where the structure is damaged due to earthquake. The combined FAE scenarios involve two different stages: during the first stage, the structure is subjected to the ground motion record, while in the second stage the fire occurs. Different time-acceleration records are examined, each scaled to multiple levels of the Peak Ground Acceleration (PGA) in order to represent more severe earthquakes with lower probability of occurrence. In order to study in a systematic manner the behavior of the structure for the various FAE scenarios, a two-dimensional beam finite element model is developed, using the non-linear finite element analysis code MSC-MARC. The fire resistance of the structure is determined using rotational limits based on the ductility of structural members that are subjected to fire. These limits are temperature dependent and take into account the level of the structural damage at the end of the earthquake and the effect of geometric initial imperfections of structural members.

Behavior of Dams during the 1995 Hyogoken-Nambu Earthquake and Earthquake Resistance of Dams

  • Yamaguchi, Yoshikazu
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.3-14
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    • 1999
  • The Hyogoken-Nambu Earthquake of January 17, 1995 inflicted severe damage in the Hanshin and Awaji areas such as has never been seen in Japan in recent years. The safety inspections of the dams conducted in the area by site offices and dam experts immediately after the earthquake showed that there was no damage affecting the safety of the dams although slight damage was observed in several dams. The investigation also revealed that the peak accelerations at dam sites were much smaller than those at soil sites. The Ministry of construction organized the Committee on Evaluattion of Earthquake Resistance of Dams after the earthquake. The Committee confirmed through dynamic analysis that the dams designed in accordance with the present design criteria in Japan are safe under the magnitude of shaking that occurred close the source fault of the Hyogoken-Nambu Earthquake.

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A Study on the Seismic Response Analysis of Reinforced Concrete Building (철근콘크리트 건물의 지진응답해석에 관한 연구)

  • 한상훈;이상호
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.507-512
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    • 1997
  • The objective of present paper is to provide the fundamental data of earthquake-resistance design such as estimating the resistance capacity and evaluating the design seismic load. With one bending failed building, it is checked and compared between real damaged result and analysis value by means of static and dynamic analysis using multi-degree of freedom system. In this analysis, four kinds of the earthquake waves are used. Through elasto-plastic seismic response analysis of reinforced concrete building, we could estimate dynamic behaviour of building.

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An Experimental Study for the Liquefaction Resistance Strength of Saturated Sand Using Real Earthquake Loading (실지진하중을 이용한 포화사질토의 액상화 저항강도에 관한 실험적 연구)

  • 심재욱;박근보;최재순;김수일
    • Journal of the Korean Geotechnical Society
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    • v.18 no.4
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    • pp.329-337
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    • 2002
  • Based on the equivalent uniform stress concept presented by Seed and Idriss, sinusoidal cyclic loads which simplified the earthquake loads have been applied in evaluating the liquefaction resistance strength experimentally. However, the liquefaction resistance strength of soil based on the equivalent uniform stress concept can not exactly reflect the dynamic characteristics of the irregular earthquake motion. In this study, the criterion of the liquefaction resistance strength was determined by applying real earthquake loading to the cyclic triaxial test. From the test results, relationships between liquefaction behaviors of saturated sand and earthquake characteristics such as magnitude or time-duration were determined. Magnitude scaling factors to determine the soil liquefaction resistance strength in seismic design were also proposed.

A Study on the Liquefaction Resistance of Anisotropic Sample under Real Earthquake Loading (이방 구속 조건에서 실지진 하중을 이용한 액상화 저항강도 특성 분석)

  • Lee, Chae-Jin;Jeong, Sang-Seom;Kim, Soo-Il
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1188-1191
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    • 2009
  • In this study, cyclic triaxial tests were performed with the samples which were anisotropically consolidated using irregular earthquake loading to consider in-situ condition and seismic wave. The consolidation pressure ratio(K) was changed from 0.5 to 1.0. The Ofunato and Hachinohe wave are applied as irregular earthquake loading and liquefaction resistance strength was estimated from excess pore water pressure(EPWP) ratio. As results of the cyclic triaxial tests, buildup of EPWP ratio increased as K value increased. It shows, that the isotropically consolidated sands is more susceptible to liquefaction than anisotropically consolidated sands under equal conditions such as confining pressure and dynamic loading.

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