• Title/Summary/Keyword: seismic

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Development of the Modified Seismic Coefficient Method to Establish Seismic Design Criteria of Buried Box Structures. (BOX 형 지하구조물의 내진설계 기준 확립을 위한 해석기법개발)

  • 박성우
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2000.04a
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    • pp.194-201
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    • 2000
  • In this study the modified seismic coefficient method for seismic analysis of buried box structures is developed for practical purpose. The loading coefficient in the modified seismic coefficient method is determined from the results of the response displacement analysis. In the developed method adequate velocity response spectrum in accordance with soil condition is also needed to seismic design of buried box structures, In order to investigate applicability of the modified seismic coefficient method various analyses are performed with different parameters such as depth of base rock height and width of box buried depth and value of standard penetration test. Results from the modified seismic coefficient method are compared with those of the response displacement method in terms of the maximum bending moment and the location of it. From the comparison it is shown that the feasibility of the modified seismic coefficient method for seismic analysis of buried box structures.

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Slope Stability Analysis Using Modified Seismic Intensity Method During Earthquake (수정진도법에 의한 지진시의 사면안정해석에 관하여)

  • 오병현
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2000.10a
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    • pp.124-131
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    • 2000
  • Numerical analysis of slop stability is carried out using seismic intensity, modified seismic intensity, and response seismic coefficient methods. It is found by comparing each of method that minimum safety factor precedes the required safety factor. It is also proved during analysis that most conservative method is the earthquake response analysis method, next is the response seismic coefficient method, and last one is the seismic intensity method. Usually, seismic intensity method is applied in analysis of slop stability. However, in view of safety factor, modified seismic intensity method is more conservative than seismic intensity method. Also modified seismic intensity method is appropriate when height of structure analyzed is high enough.

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The Seismic Behavior of the Truss-Arch Structure by Lead Rubber Bearing and Friction Pendulum System with Seismic Isolation (납고무받침 면진장치와 마찰진자 면진장치에 의한 트러스-아치 구조물의 지진거동 비교)

  • Kim, Gee-Cheol;Seok, Keun-Yung;Kang, Joo-Won
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.374-379
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    • 2008
  • The purpose of seismic isolation system among them is to lengthen the period of structure and make its period shift from the dominant period of earthquake. In this study, the seismic behavior of arch structure with lead rubber bearing(LRB) and friction pendulum system(FPS) is analyzed. The arch structure is the simplest structure and has the basic dynamic characteristics among large spatial structures. Also, Large spatial structures have large vertical response by horizontal seismic vibration, unlike seismic behavior of normal rahmen structures. When horizontal seismic load is applied to the large spatial structure with isolation systems, the horizontal acceleration response of the large spatial structure is reduced and the vertical seismic response is remarkably reduced.

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Parametric seismic evaluation of highway overpass bridges in moderate seismic areas

  • Simon, Jozsef;Vigh, Gergely L.
    • Earthquakes and Structures
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    • v.12 no.3
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    • pp.375-388
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    • 2017
  • Prior to modern seismic provisions, several bridges were not designed for seismic actions in moderate seismic areas. Precast multi-girder and slab bridges are typical highway overpass structures; they have a significant contribution to national bridge stocks. Since the seismic behavior is questionable, a preliminary parametric study is conducted to determine critical configurations and components. The results indicate that the behavior of the abutments, backfill soil, superstructure and foundation is normally satisfactory; however, the superstructure-abutment joints are critical for both single- and multi-span bridges, while the piers are also critical for longer multi-span configurations. The parametric results provide a solid basis both for detailed seismic assessment and development of design concepts of newly built structures in moderate seismic zones.

Analysis of seismic response of 3-span continuous curved bridges (3경간 연속곡선교의 지진응답 특성분석)

  • Kim, Sang-Hyo;Lee, Sang-Woo;Cho, Kwang-Il;Park, Boung-Kyu
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2005.03a
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    • pp.380-387
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    • 2005
  • Little has been understood about the seismic behavior of curved bridges due to the different structural characteristics compared to straight bridges. In this study, a simple numerical model, widely used for seismic analysis, is modified for a more realistic estimation of the seismic behavior. The seismic response of curved bridges obtained with the modified simple numerical model was compared with the result using a more sophisticated model to verify the feasibility. Seismic analyses were performed on three-span continuous curved bridges, which is a structural system widely used in highway structures. Numerical model of the three-span continuous curved bridges were subjected to seismic loads in diverse directions. From the result of the analysis. it was found that the direction of the seismic load have significant effect of the seismic behavior of curved bridges when the central angle exceeds 90 degrees.

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A Study on Evaluation Method of Seismic Performance on Cut and Cover Tunnel of Subway in Japan (일본 도시철도 개착식 터널의 내진성능 평가 방법에 대한 고찰)

  • Park, Beom-Ho;Lee, Woo-Chul;Kim, Jin-Ho;Lim, Ham-Hyoung
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.15-19
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    • 2009
  • Due to the Japan's Kobe earthquake in 1995, a cut-and-cover tunnel, which is one of subway facilities, collapsed unexpectedly. As a result, also in Korea, seismic performance needs to be secured for the cut-and-cover tunnel and currently, the subway seismic design standard is based on the seismic performance. However, there is no standard for the damage level or stability level of a member for securing the seismic performance, and the definition of multi-level seismic performance is not sufficient. By contrast to this situation, in the Japan's evaluation method of seismic performance, design earthquake ground motion having reflected there into the subway driving stability is clearly defined and the seismic performance required for structures is classified in detail. This study analyzes the Japan's systematic evaluation method of seismic performance for cut-and-cover tunnels of subway.

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Analysis of Regional Seismic Characters for Establishing Seismic Zone Factor (지역계수 설정을 위한 지역별 지진발생특성 분석)

  • Kwon, Ki-Hyuk;Hwang, Wan-Seon;Seo, Chee-Ho
    • Journal of the Korean Society of Hazard Mitigation
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    • v.6 no.3 s.22
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    • pp.1-8
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    • 2006
  • The seismic zone factor is evaluated according to the regional characteristics of seismic response based on the historical and instrumental earthquake data. This study aims at arranging regional seismic characteristics by the analysis of earthquake data recorded in the Korean Peninsula and providing the fundamental data to be used for establishing seismic zone factor considering the domestic seismic characteristics. This paper provides the seismic characteristics in the Korean Peninsula according to the historical and instrumental records and then presents fundamental data for establishing seismic zone factors in domestic region.

Full-Scale Shaking Table Test and Analysis of Seismic Ceiling Systems (내진 천장시스템의 실규모 진동대 실험 및 해석)

  • Kim, Hoyeon;Choi, Yong-Soo;Sim, Jaeil;Cho, Chang-Geun
    • Journal of Korean Association for Spatial Structures
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    • v.18 no.1
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    • pp.135-143
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    • 2018
  • In the current research, a seismic ceiling system as one of non-structural elements in buildings has been developed by applying newly designed vertical hanger clips combined with M-bar channel clips. In order to evaluate the seismic performance of the developed system, full-scale shaking table tests of one story frame structure with the conventional ceiling system or the developed seismic ceiling system were performed with time-history responses under earthquake loads. The developed system was also evaluated by the time-history dynamic analysis. From seismic test and analysis, it was shown that the developed seismic ceiling system could give improved seismic performances to minimize displacements and damages of ceiling systems as well as enhance seismic safety of the ceiling system.

Extracting Seismic Reinforcement Priorities to Promote Safety at Airmen Dormitories Using DEA (DEA 기법을 이용한 공군 병영생활관 내진보강 우선순위 도출)

  • Park, Keunwoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.22 no.5
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    • pp.697-704
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    • 2019
  • The public has grown more anxious towards domestic earthquakes that have been taking place since 2000, and regulations on seismic design has been strengthened. Out of 4,605 Air Force installations that require the application of seismic design, 2,982 remain unapplied. By taking budget issues and the time spent to implement seismic retrofit into account, this paper aims to list up seismic reinforcement priorities for airmen dormitories where they can potentially be most vulnerable to earthquakes. The priorities are extracted based on Data Envelope Analysis(DEA). To apply DEA, two sets of variables are set: seismic reinforcement costs as input variable: age of building, number of residents, and seismic load as output variables. At the end, suggestions are made for developing seismic reinforcement plans that can be applied to all Air Force installations.

Effect of connection rotation capacities on seismic performance of IMF systems

  • Han, Sang Whan;Moon, Ki-Hoon;Ha, Sung Jin
    • Earthquakes and Structures
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    • v.10 no.1
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    • pp.73-89
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    • 2016
  • The seismic performance of moment frames could vary according to the rotation capacity of their connections. The minimum rotation capacity of moment connections for steel intermediate moment frames (IMF) was defined as 0.02 radian in AISC 341-10. This study evaluated the seismic performance of IMF frames with connections having a rotation capacity of 0.02 radian. For this purpose, thirty IMFs were designed according to current seismic design provisions considering different design parameters such as the number of stories, span length, and seismic design categories. The procedure specified in FEMA P695 was used for conducting seismic performance evaluation. It was observed that the rotation capacity of 0.02 radian could not guarantee the satisfactory seismic performance of IMFs. This study also conducted seismic performance evaluation for IMFs with connections having the rotation capacity of 3% and ductile connections for proposing the minimum rotation capacity of IMF connections.