• Title, Summary, Keyword: DRAIN-2DX

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Correlation of Experimental and Analytical Inelastic Responses of A 1:12 Scale 10-Story Masonry-Infilled Reinforced Concrete Frame (1:12축소 10층 조적 채움 R.C. 골조의 비선형 거동에 대한 실험과 해석의 상관성)

  • 이한선;김정우
    • Journal of the Korea Concrete Institute
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    • v.12 no.1
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    • pp.101-112
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    • 2000
  • In many structures, the masonry infill panels have been used for architectural reasons and their influence on the structure is often ignored by engineers. However, it has been recognized that the presence of masonry infills may debates. Recently, the pushover analysis technique is used for the prediction of the inelastic behaviors of structures in the seismic evaluation of existing buildings. However, the reliability of this analysis method has not been fully checked with the test results, particularly in the case of masonry-infilled frames. The objective of this study is to verify the correlation between the experimental and analytical reponses of a high-rise masonry-infilled reinforced concrete frame using DRAIN-2DX program and the test results performed previously. It is concluded from this comparison that the strength and stiffness of members can be predicted with quite high reliability while the ductility capacity of members can not be described reasonably.

Life-Cycle Cost Effective Optimal Seismic Retrofit and Maintenance Strategy of Bridge Structures - (I) Development of Lifetime Seismic Reliability Analysis S/W (교량의 생애주기비용 효율적인 최적 내진보강과 유지관리전략 - (I) 생애주기 지진신뢰성해석 프로그램 개발)

  • Lee, Kwang-Min;Choi, Eun-Soo;Cho, Hyo-Nam;An, Hyoung-Jun
    • Journal of The Korean Society of Civil Engineers
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    • v.26 no.6A
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    • pp.965-976
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    • 2006
  • A realistic lifetime seismic-reliability based approach is unavoidable to perform Life-Cycle Cost (LCC)-effective optimum design, maintenance, and retrofitting of structures against seismic risk. So far, though a number of researchers have proposed the LCC-based seismic design and retrofitting methodologies, most researchers have only focused on the methodological point. Accordingly, in most works, they have not been quantitatively considered critical factors such as the effects of seismic retrofit, maintenance, and environmental stressors on lifetime seismic reliability assessment of deteriorating structures. Thus, in this study, a systemic lifetime seismic reliability analysis methodology is proposed and a program HPYER-DRAIN2DX-DS is developed to perform the desired lifetime seismic reliability analysis. To demonstrate the applicability of the program, it is applied to an example bridge with or without seismic retrofit and maintenance strategies. From the numerical investigation, it may be positively stated that HYPER-DRAIN2DX-DS can be utilized as a useful numerical tool for LCC-effective optimum seismic design, maintenance, and retrofitting of bridges.

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Reliability-based Life Cycle Cost Analysis for Optimal Seismic Upgrading of Bridges

  • Alfredo H-S. Ang;Cho, Hyo-Nam;Lim, Jong-Kwon;An, Joong-San
    • Computational Structural Engineering : An International Journal
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    • v.1 no.1
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    • pp.59-69
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    • 2001
  • This study is intended to propose a systematic approach for reliability-based assessment of life cycle cost (LCC) effectiveness and economic efficiency for cost-effective seismic upgrading of existing bridges. The LCC function is expressed as the sum of the upgrading cost and all the discounted life cycle damage costs, which is formulated as a function of the Park-Ang damage index and structural damage probability. The damage costs are expressed in terms of direct damage costs such as repair/replacement costs, human losses and property damage costs, and indirect damage costs such as road user costs and indirect regional economic losses. For dealing with a variety of uncertainties associated with earthquake loads and capacities, a simulation-based reliability approach is used. The SMART-DRAIN-2DX, which is a modified version of the well-known DRAIN-2DX, is extended by incor-porating LCC analysis based on the LCC function developed in the study. Economic efficiencies for optimal seismic upgradings of the continuous PC segmental bridges are assessed using the proposed LCC functions and benefit-cost ratio.

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Deformation Demand of the Precast Concrete Frame Buildings with Ductile Connection in Moderate Seismic Regions (연성적인 접합부를 가진 프리캐스트 콘크리트 골조건물의 변형수요)

  • 서수연;이리형
    • Journal of the Korea Concrete Institute
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    • v.11 no.5
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    • pp.89-98
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    • 1999
  • This paper evaluates nonlinear response characteristics of precast concrete frame buildings. where plastics hinging occurs in the precast connection. Designs were developed for buildings of 5, 10 and 15 stories in hight for moderate seismic risk regions of the U. S. The responses of the buildings were analyzed using DRAIN-2DX and following Nonlinear static analysis procedure of ATC 19. The main variables of the analyses were the strength and stiffness of the connection. Also, for the analysis, the bi-linear response model, developed and inserted into the DRAIN-2DX program by Shan Shi and D. Fouch, was used. With the results of analysis, the deformation demands of the connection of precast concrete frame buildings are proposed by using equal-dissipated energy capacity. It was shown that the strength of the buildings as well as their displacement capacities decreased with the decrease of either the strength or stiffness in the connections. Therefore such changes also require reductions in the response modification factors for such buildings. However, if the precast concrete frame building has plastic hinging in the connection, and has a more ductile connection than the monolithic frame building, then no reduction in R may be necessary. The deformation demand required of the connection to achieve that condition is evaluated and a simple relation is suggested in the paper.

Correlation of Experimental and Analytical Inelastic Responses of A 1:12 Scale 10-Story Reinforced Concrete Frame-Wall Structure (1:12축소 10층 철근콘크리트 골조-벽식 구조의 비선형 거동에 대한 실험과 해석의 상관성)

  • 이한선;김상호
    • Journal of the Korea Concrete Institute
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    • v.12 no.6
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    • pp.119-126
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    • 2000
  • Reinforced concrete structural walls are widely known to provide an efficient lateral load resistance and drift control. However, many reported researches on them are mostly limited to the RC structural walls reinforced according to seismic details. When the pushover analysis technique is used for the prediction of inelastic behavior of frame-wall structures for the seismic evaluation of existing buildings having non-seismic details, the reliability of this analysis method should be checked by the test results. The objective of this study is to verify the correlation between the experimental and analytical responses of a high-rise reinforced concrete frame-wall structure having non-seismic details by using DRAIN-2DX program[11] and the test results performed previously[1]. It is concluded that the behavior of the frame-wall model is mainly affected by the fixed-end rotation(uplift at base) and bending deformation of the wall and that the analysis with the LINKS model[10] in DRAIN-2DX describes them with good reliability.

Analytical Modeling for Nonlinear Behaviors of a Masonry-Infilled RC Frame (조적채움 RC 골조의 비선형 거동에 대한 해석 모텔)

  • 이한선;우성우
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.227-234
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    • 2001
  • The responses of a 1:5 scale 3-story masonry-infilled RC frame which was designed only for gravity loads were simulated by using a nonlinear analysis program, DRAIN-2DX The objective of this study is to verify the correlation between the experimental and analytical responses of masonry-infilled RC frame. It is concluded from this comparison that the strength and stillness of the whole structure can be predicted with quite high reliability using compressive strut (compression link element, Type 09) while some local behavior cannot be described reasonably.

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Correlation of Experimental and Analytical Responses in Nonlinear Behaviors of a Masonry-Infilled RC Frame (조적채움 RC골조의 비선켱 거동애 대한 실험과 해석의 상관성)

  • 이한선;우성우
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.313-320
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    • 2003
  • The responses of a 1:5 scale 3-story masonry-infilled RC frame which was designed only for gravity loads were simulated by using a nonlinear analysis program, DRAIN-2DX. The objective of this study is to verify the correlation between the experimental and analytical responses of a masonry-infilled RC frame. It is concluded from this comparison that the strength and stiffness of the whole structure can be predicted with quite high reliability using compressive strut (compression link element, Type 09).

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Energy Dissipation Demand of Braces Using Non-linear Dynamic Analyses of X-Braced Frame (비선형 동적 해석을 통한 X형 가새골조 내 가새 부재의 에너지 소산)

  • Lee, Kangmin
    • Journal of Korean Society of Steel Construction
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    • v.15 no.4
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    • pp.379-388
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    • 2003
  • The response of single story buildings and other case studies were investigated to observe trends and develop a better understanding of the impact of some design parameters on the seismic response of Concentrically Braced Frames (CBF). While many parameters are known to influence the behavior of braced frames, the focus of this study was mostly on quantifying energy dissipation in compression and its effectiveness on seismic performance. Based on dynamic analyses of single story braced frame and case studies, a bracing member designed with bigger R and larger KL/r was found to result in lower normalized cumulative energy ratio in both cases.

Nonlinear Analysis of Precast Concrete Wall Structures (프리캐스트 콘크리트 판구조의 비선형 해석)

  • 서수연;이원호;이리형
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.13 no.2
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    • pp.189-196
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    • 2000
  • The objective of this paper is to propose an analysis technique to predict the behavior of PC wall structures subjected to cyclic load. While PC wall panel is idealized by finite elements, the joints at which PC walls are connected each other are idealized by nonlinear spring elements. Axial and shear spring elements are developed for simulating shear, compression and tension behaviors of joints. The strength and stiffness of each spring elements we presented from the previous research results and incorporated into the computer program of DRAIN-2DX. The proposed analysis technique is evaluated by analyzing specimens previously tested and comparing with those. On the strength, stiffness, energy dissipation and lateral drift, analytical results show good agreements with test results. This means the proposed technique is effective to predict the response of the PC wall structures.

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Correlation of Experimental and Analytical Inelastic Responses of A 1:12 Scale 10-Story Reinforced Concrete Frame with Non-seismic Details (비내진 상세를 가진 1:12축소 10층 R.C.골조의 비선형 거동에 대한 실험과 해석의 상관성)

  • Lee, Han-Seon;Kang, Kyi-Yong
    • Magazine of the Korea Concrete Institute
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    • v.11 no.1
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    • pp.267-277
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    • 1999
  • The pushover analysis technique is now attracting the world-wide interest for the prediction of elastic and inelastic behavior of structures in the seismic evaluation of existing buildings. However, the reliability of this analysis technique has not been fully checked by the test results in the case of structures with nonseismic details. The objective of this study is to verify the correlation between the experimental and analytical responses of a 1:12 scale 10-story reinforced concrete frame with non-seismic details by using DRAIN-2DX program and the test results performed previously. It is concluded from this comparison that the overall responses such as the relations between story shear versus interstory drift and the local deformations such as plastic rotations can be predicted with quite high reliability.