• Title/Summary/Keyword: 성능기반 내진설계법

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Seismic Behavior Characteristics of Ground Storage Circular Tanks and Proposal of Performance-based Seismic Design Method (평저형 원형 저장탱크의 지진거동 특성 및 성능기반 내진설계법 제안)

  • Han dong yun;Sun chang ho;Kim ick hyun;Nam, hyung mo
    • Journal of the Korean Institute of Gas
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    • v.27 no.4
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    • pp.34-42
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    • 2023
  • Considering the contribution of industrial facilities to the national economy, securing operability against earthquakes is very important. However, the basic concept of current seismic design mainly allows ductile behavior of facilities against large-scale earthquakes and only considers structural safety for the purpose of preventing collapse. In order to secure the operability of industrial facilities, the level of seismic performance to maintain operability may vary depending on the structural behavior characteristics of the industrial facility, and a seismic design method is needed to satisfy this. In this study, a ground storage tanks Nonlinear seismic behavior characteristics(R-μ-T) were analyzed through nonlinear response history analysis, and based on this, a new reliability-based, performance-based seismic design method was proposed.

Seismic Characteristics of Hollow Rectangular Sectional Piers with Reduced Lateral Reinforcements (횡방향철근이 감소된 중공사각단면 교각의 내진거동 특성)

  • Sun, Chang-Ho;Kim, Ick-Hyun
    • Journal of the Earthquake Engineering Society of Korea
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    • v.13 no.3
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    • pp.51-65
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    • 2009
  • The seismic design concept of RC bridges is to attain the proper ductility of piers, yielding a ductile failure mechanism. Therefore, seismic design force for moment is determined by introducing a response modification factor (R), and lateral reinforcements to confine core concrete are specified in the current design code. However, these design provisions have irrationality, which results in excessive amounts of lateral reinforcements for columns in Korea, which are generally designed with large sections. To improve on these provisions, a new design method based on seismic performance has been proposed. To apply this to hollow sectional columns, however, further investigations and improvements must be performed, due to the different seismic behaviors and confinement effects. In this study, hollow sectional columns with different lap-splice of longitudinal bars and lateral reinforcements have been tested. Seismic characteristics and performance were investigated quantitatively. These research results can be used to derive a performance-based design for hollow sectional columns.

Limited-Ductile Seismic Design and Performance Assessment Method of RC Bridge Piers Based on Displacement Ductility (변위연성도 기반 철근콘크리트 교각의 한정연성 내진 설계법과 성능평가 방법)

  • Park, Chang-Kyu;Chung, Young-Soo;Lee, Dae-Hyoung
    • Journal of the Korea Concrete Institute
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    • v.19 no.1
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    • pp.19-26
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    • 2007
  • Until recently Korea is considered to be immune from the earthquake hazard because it is located for away from the active fault. However, we have noticed that recent strong earthquakes inflicted enormous losses on human lives and nation's economy all over the world. Hence, there has been raised the importance of the earthquake resistant design for various infrastructures. In this research, new methodologies for the seismic design and performance assessment of reinforced concrete(RC) bridge pier were proposed from experimental results of 82 circular RC bridge piers and 54 rectangular RC bridge piers tested in domestic and aboard. New seismic design method was based on the concept of the limited ductile design, which could be practically used for low or moderate seismic regions like Korea. Further study for the seismic safety of RC bridge piers was carried out to enhance the seismic performance of aged RC bridge piers, which were designed and constructed before implementing the 1992 seismic design provision in Korea. New formula for the seismic performance assessment of RC bridge piers was proposed and practically used for the decision on the need of repair and retrofit of many aged RC bridge piers.

Seismic Performance Evaluation of Mechanically Jointed PE Pipeline by Response Displacement Method (기계식 이음 PE관의 응답변위법 기반 내진성능평가 요령)

  • DongSoon Park
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.4
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    • pp.23-32
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    • 2023
  • The seismic performance of buried PE pipes is reported to be favorable due to their exceptional elongation capacity at break. Although a seismic performance evaluation procedure based on the response displacement method has been summarized in Korea for fusion-bonded PE pipes, there is currently no procedure available for mechanically jointed PE pipes. This article aims to present a seismic performance evaluation procedure based on the response displacement method specifically designed for mechanically jointed PE pipes in Korea. When employing the mechanical joining method for PE pipes, it is recommended to adhere to the evaluation procedure established for segment-type pipes. This involves assessing the stress induced by the pipe, the expansion and contraction strain of the joint, and the bending angle of the pipe joint. Furthermore, the coefficient of inhomogeneity of the soil, which is necessary for estimating the axial strain of the ground, is introduced. Additionally, a computation method for determining lateral displacement and reconsolidation settlement in soil susceptible to liquefaction is proposed. As a result of the sensitivity analysis considering the typical soil condition in Korea, the mechanically jointed PE pipe with a certain quality was shown to have good structural seismic safety when soil liquefaction was not considered. This procedure serves as a valuable tool for seismic design and evaluating the seismic performance of mechanically joined buried PE pipes, which are primarily utilized for connecting small-diameter pipes.

The Seismic Design of Water Extinguishing Piping Systems for Equivalent Static Analysis Method (등가정적해석법에 의한 수계 파이프 시스템의 내진설계)

  • Lee, Dong-Myung
    • Fire Science and Engineering
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    • v.26 no.3
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    • pp.100-105
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    • 2012
  • In this study, seismic design in pipeline of pressurized water supply system of water extinguishing system has been carried out. This study described a generation of artificial earthquake wave compatible with seismic design spectrum, and also determined equivalent static loads to analyzed the response spectra acceleration by the simulated earthquake motion. This study constructed powerful engineering base for seismic design, and presented equivalent static analysis method for seismic design of water and gas extinguishing piping system. Also, this study readied basis that can apply seismic design and performance estimation of fire fighting system as well as pipeline of water extinguishing system from result of this research. Hereafter, if additional research by earthquake magnitude and ground kind is approached, reliance elevation, safety raising and performance based design of fire fighting system see to achieve.

Displacement Based Seismic Design of Steel jacket Retrofitted Reinforced Concrete Column (Steel-Jacket 보강 철근콘크리트 기둥의 변위기반 내진설계)

  • Jung, In-Kju;Cho, Chang-Geun;Park, Moon-Ho;Park, Soon-Eung;Nam, Yoo-Seok
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.197-198
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    • 2009
  • This study is the research appling the representative Displacement-Based Design which is the basic concept of Direct Displacement Based Design proposed by Chopra and Goel to original Reinforced Concrete structure and determining the thickness of retrofit Steel Jacket about the Maximum design ground acceleration, and developing the more improved Algorithm as well as program by the Retrofit Design method and Nonlinear analysis by the Performance design method before and after reinforcement appling the determined retrofit thickness.

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Optimal design of nonlinear seismic isolation system by a multi-objective optimization technique integrated with a stochastic linearization method (추계학적 선형화 기법을 접목한 다목적 최적화기법에 의한 비선형 지진격리시스템의 최적설계)

  • Kwag, Shin-Young;Ok, Seung-Yong;Koh, Hyun-Moo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.14 no.2
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    • pp.1-13
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    • 2010
  • This paper proposes an optimal design method for the nonlinear seismic isolated bridge. The probabilities of failure at the pier and the seismic isolator are considered as objective functions for optimal design, and a multi-objective optimization technique is employed to efficiently explore a set of multiple solutions optimizing mutually-conflicting objective functions at the same time. In addition, a stochastic linearization method is incorporated into the multi-objective optimization framework in order to effectively estimate the stochastic responses of the bridge without performing numerous nonlinear time history analyses during the optimization process. As a numerical example to demonstrate the efficiency of the proposed method, the Nam-Han river bridge is taken into account, and the proposed method and the existing life-cycle-cost based design method are both applied for the purpose of comparing their seismic performances. The comparative results demonstrate that the proposed method not only shows better seismic performance but also is more economical than the existing cost-based design method. The proposed method is also proven to guarantee improved performance under variations in seismic intensity, in bandwidth and in the predominant frequency of the seismic event.

2D Numerical Simulation of a Dynamic Centrifuge Test for a Pile-Supported Structure (2차원 수치해석을 이용한 말뚝 지지구조물의 동적 원심모형실험 거동 모사)

  • Chanh, Pham Viet;Tran, Nghiem Xuan;Kim, Sung-Ryul
    • Journal of the Korean Geotechnical Society
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    • v.34 no.8
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    • pp.15-26
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    • 2018
  • Recently, as the seismic performance based design methods have been introduced, dynamic numerical analyses need to be performed to evaluate the actual performance of structures under earthquakes. The verification of the numerical modeling is the most important for the performance based design. Therefore, 2-dimensional numerical analyses were performed to simulate the seismic behavior of a pile-supported structure, to provide the proper numerical modeling and to determine of input parameters. A dynamic centrifuge test of a pile group in dry loose sand was simulated to verify the applicability of the numerical model. The numerical modeling was carefully made to reflect the actual condition of the centrifuge test including dynamic soil properties, soil-pile interaction, boundary condition, the modeling of the group pile and structure and so on. The predicted behavior of the numerical analyses successfully simulated the acceleration variation in ground, the moment and displacement of the pile, and the displacement and acceleration of the structure. Therefore, the adopted numerical modeling and the input parameters can be used to evaluate the seismic performance of pile groups.

Development of the Optimal Performance Based Seismic Design Method for 2D Steel Moment Resisting Frames (2차원 철골 구조물의 최적 성능기반 내진설계법 개발)

  • Kwon Bong-Keun;Lee Hyun-Kook;Kwon Yun-Man;Park Hyo-Seon
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2005.04a
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    • pp.636-643
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    • 2005
  • Recently, performance based seismic design (PBSD) methods have been suggested in numerous forms and widely studied as a new concept of seismic design. The PBDSs are far from being practical method due to complexity of algorithms resided in the design philosophy. In this paper, optimal seismic design method based on displacement coefficient method (DCM) described in FEMA 273 is developed. As an optimizer simple genetic algorithms are used for implementations. In the optimization problem formulated in this Paper, strength design criteria stiffness design criteria, and nonlinear response criteria specified in DCM are included in design constraints. The optimal performance based design(OPBD) method is applied to seismic design of a 3-story two-dimensional steel frame structures.

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A Study on Seismic Performance Evaluation of Road Tunnel according to Seismic Analysis Conditions (내진해석 조건에 따른 도로터널 내진성능평가에 관한 연구)

  • Choi, Byoung-Il;Kim, Chan-Hee;Noh, Eun-Cheol;Ha, Myung-Ho;Park, Si-Hyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.5
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    • pp.127-134
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    • 2021
  • When constructing a tunnel on a stable ground, stress is changed in the ground during excavation stage and installation of ground support materials. In the standards for safety evaluation of structures in use, it is suggested to perform numerical analysis reflecting the excavation stage. But method of seismic performance evaluation was not presented. Therefore, in this study, numerical analysis was performed with different analysis methods, and the results were compared and analyzed. As a result of the numerical analysis, seismic wave applied in the horizontal direction were no difference depending on the analysis methods. However, there was a big difference in the result according to the evaluation methods of tunnel member forces. When reviewing with the strength design method, the structure performance could be not satisfied depending on the existence or nonexistence of reinforcing bars. Based on these research results, it is suggested that the interpretation method should be clearly presented and reflected in the relevant standards.