• Title/Summary/Keyword: seismic applicability

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Multi-Step Analysis of Seismically Isolated NPP Containment Structures with Lead-Rubber Bearings (납-고무받침에 의해 면진된 원전 격납구조물의 다중단계해석)

  • Lee, Jin Hi;Song, Jong-Keol;Lee, Eun-Haeng
    • Journal of the Earthquake Engineering Society of Korea
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    • v.18 no.6
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    • pp.261-269
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    • 2014
  • In order to increase the seismic safety of nuclear power plant (NPP) structures in high seismicity regions, seismic isolation techniques can be adapted to NPP structures. In this paper, the applicability of multi-step analysis of seismically isolated NPP containment structures with lead-rubber bearings (LRB) is evaluated. The floor response spectrum of NPP containment structures with equivalent linear LRB and nonlinear LRB are compared. In addition, the force-displacement relationships for equivalent linear LRB and nonlinear LRB are compared.

Performance based seismic design for the seismic evaluation of cable-stayed bridges (성능기반 내진설계법을 이용한 사장교의 지진해석)

  • Kwak, Hyo-Gyoung;Shin, Dong-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.461-462
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    • 2009
  • Since the modal pushover analysis (MPA) is introduced by A.K.Chopra in 2002, it has been the leading procedure for the seismic evalution of structures. However it has scarcely used on bridge structures dueing to its inherent limitation. In this paper, MPA is applied on cable-stayed bridges to check its applicability on such structures.

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Earthquake Response Analysis of a RC Bridge employing a Point Hinge Model (포인트 힌지 모델을 적용한 철근콘크리트 교량의 지진응답 해석)

  • 이도형;전종수;박대효
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.04a
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    • pp.419-426
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    • 2003
  • Simplified modeling approach for the seismic behavior of a reinforced concrete bridge is investigated in this paper. For this purpose, a hysteretic axial-flexure interaction model was developed and implemented into a nonlinear finite element analysis program. Thus, the seismic response of reinforced concrete bridge piers was evaluated by the simplified point hinge representations. Comparative studies for reinforced concrete bridge piers indicated that the analytical predictions obtained with the new formulations showed a good correlation with experimental results. In addition, seismic response analysis of a reinforced concrete bridge utilizing the simplified point hinge model revealed the adequacy and applicability of the present development.

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Seismic Design Method for Structural Walls Based on Energy Dissipation Capacity (에너지 소산능력을 고려한 전단벽의 내진설계)

  • 박홍근;엄태성;정연희
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2002.09a
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    • pp.247-257
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    • 2002
  • Recently, performance-based analysis/design methods such as the capacity spectrum method and the direct displacement-based design method were developed. In these methods, the estimation of energy dissipation capacity due to inelastic behavior of RC structures depends on empirical equations which are not sufficiently accurate. On the other hand, in a recent study, a simplified method for evaluating energy dissipation capacity was developed. In the present study, based on the evaluation method, a new seismic design method for flexure-dominated RC walls is developed. In determination of seismic earthquake load, the proposed design method can address variation of the energy dissipation capacity with design parameters such as dimensions and shapes of cross-sections, axial force, and reinforcement ratio and arrangement. The proposed design method is compared with the current performance-based design methods and the applicability of the proposed method is disscussed.

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Application of Modal Pushover Analysis for Deformation Capacity Evaluation of Steel Moment Frames (철골구조물의 변형능력평가를 위한 MPA 방법의 적용성 검토)

  • 최원호;김기주;이동근
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2002.09a
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    • pp.266-273
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    • 2002
  • Pushover analysis is frequently used for evaluation of seismic performance and determination of seismic demand of a building structure in the current structural engineering practice field. However, pushover analysis has a advantage for estimation of seismic demands, which cannot account for the contributions of higher modes to response or for a redistribution of inertia forces because of structural yielding and the associated changes in the vibration properties of the structures. Recently, Chopra and Coel(2001) derived uncoupled inelastic dynamic equation of motion with several assumptions in the pushover analysis. By using this approach, pushover analysis for each mode is carried out and modal pushover analysis method, which can consider higher mode effects of the building, was suggested. The principle objective of this study is to introduced the modal pushover analysis by Chopra et al.(2001) and investigated the applicability and validity of this method for the steel moment frames subjected to various earthquake ground motions.

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Evaluation of the rock property around TBM tunnels using seismic reflective survey data and TBM driving data

  • Aoki Kenji;Mito Yoshitada;Yamamoto Takuji;Shirasage Suguru
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.288-295
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    • 2003
  • The relationship between the reflection number obtained from seismic reflective survey and the rock strength value obtained from TBM excavation is examined, and the procedure of the conversion from the reflection number to the rock strength value is proposed. Subsequently, geostatistical method is employed to evaluate the rock properties ahead of the tunnel face and around the tunnel with good precision, using both the seismic reflective survey data and the TBM driving data for the purpose of the tunnel driving and enlargement. The applicability of this evaluation method is examined at the actual tunnel site.

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Seismic Analysis of Cable-Supported Bridges (케이블 지지교량의 내진해석)

  • 서영국;정운용;조준상
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.10a
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    • pp.233-240
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    • 1999
  • A general procedure is presented here to develope seismic design and analysis method for cable-supported bridges like suspension bridges subjected to ground motion. For representing a numerical model of suspension bridges. a new approach which satisfy design conditions for the initial equilibrium state of suspension bridges. without any nonlinear iterations. is proposed. The dynamic behavior of that model is verified by free vibration analysis. This study uses the response spectrum analysis to determine the Peak response of a suspension bridge to earthquake-induced ground motion. The SRSS(Square Root of Sum of Square). modal combination rule, is adopted for each direction, longitudinal and transverse. To illustrate the potential applicability for the seismic design of suspension bridges, a numerical example is presented in which the dynamic response of the Nam-hae suspension bridge subjected to earthquake

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An Evaluation on the Seismic Stability of a Railway Bridge Pile Foundation Considering Soil-Structure Interaction (지반-구조물 상호작용을 고려한 철도 교량하부 말뚝 기초의 내진 안정성 평가)

  • 이기호;신민호
    • Journal of the Korean Society for Railway
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    • v.6 no.1
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    • pp.29-40
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    • 2003
  • In this study, the three dimensional pile-soil dynamic interaction analysis of the railway bridge pile foundation was performed using SASSI 2000 program and the applicability of SASSI 2000 about an evaluation of the seismic stability of a pile foundation was examined. The numerical analysis was executed on the two site of actual construction and input properties such as the acceleration of bedrock were estimated by one dimensional seismic response analysis using the Pro-SHAKE. Consequently, all the piles of the subject of investigation showed that displacement occurred within a permitted limit and the shear force and moment largely occurred at the point where the soil stiffness varied rapidly.

Experimental evaluation on the seismic performance of steel knee braced frame structures with energy dissipation mechanism

  • Hsu, H.L.;Juang, J.L.;Chou, C.H.
    • Steel and Composite Structures
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    • v.11 no.1
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    • pp.77-91
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    • 2011
  • This study experimentally evaluated the seismic performance of steel knee braced frame structures with energy dissipation mechanism. A series of cyclic load tests were conducted on the steel moment resisting frames and the proposed knee braced frames. Test results validated that the demand in the beam-to-column connection designs was alleviated by the proposed design method. Test results also showed that the strength and stiffness of the proposed design were effectively enhanced. Comparisons in energy dissipation between the steel moment resisting frames and the steel knee braced frames further justified the applicability of the proposed method.

Applications of Seismic Test using Multi-platform Shaking Table System (내진실험 연구를 위한 다지점 가진 지동대의 활용)

  • Choi, Hyoung-Suk;Kim, Nam-Sik;Cheung, Jin-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.10a
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    • pp.126-131
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    • 2013
  • As the testing instrument for seismic research, the multi-platform shaking table system of SESTEC in the Pusan National University was introduced to suggest the multi-support shaking table testing methods and also to investigate its ability and applicability. 2 spans single-pylon cable-stayed bridge model, 3 spans girder bridge model and nuclear piping system model are presented and the acceleration and displacement table feedbacks of the each tests are compared to verify the simultaneous excitation ability in time domain and frequency domain.

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