• Title/Summary/Keyword: seismic performance

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The Capacity Design Method towards Improving Seismic Perfor mance of Gravity-Load Designed R/C Frames (내진역량설계법(Capacity Design Method)을 이용한 비내진설계 R/C 골조의 내진 성능 향상기법)

  • 조봉호
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.209-216
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    • 1997
  • The seismic performance of R/C frame structure designed for gravity load investigated in this paper. The investigation shows a satisfactory seismic performance against moderate earthquakes but column sway failure mechanism against severe earthquakes. Capacity design method is employed to redesign the R/C frame to improve seismic performance. This study provides an insight an insight into seismic upgrading methodology for medium rise R/C frame structures designed gravity load.

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Design of Active Mass Damper to Improve Seismic Performance Using Capacity Spectrum Method (내진성능 향상을 위한 능력스펙트럼법에 의한 능동제어기 설계)

  • 김형섭;민경원
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.259-266
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    • 2003
  • This paper begins with the seismic performance evaluation of an existing building, which exhibits the need of additional damping to reduce its response. Required damping ratio is found by capacity spectrum method to satisfy a target response. It is expressed with the design parameter of active mass damper by adopting Linear Quadratic Regulator, Optimal gains are obtained and then weighting matrices are found. Finally the seismic performance by added active mass damper is demonstrated, which satisfies the target response.

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Seismic performance assessment of steel reinforced concrete members accounting for double pivot stiffness degradation

  • Juang, Jia-Lin;Hsu, Hsieh-Lung
    • Steel and Composite Structures
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    • v.8 no.6
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    • pp.441-455
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    • 2008
  • This paper presents an effective hysteretic model for the prediction and evaluation of steel reinforced concrete member seismic performance. This model adopts the load-deformation relationship acquired from monotonic load tests and incorporates the double-pivot behavior of composite members subjected to cyclic loads. Deterioration in member stiffness was accounted in the analytical model. The composite member performance assessment control parameters were calibrated from the test results. Comparisons between the cyclic load test results and analytical model validated the proposed method's effectiveness.

SEismic Performance of Circular RC Bridge Piers designed in Moderate on low Seismic Zone (중.약진 지역의 원형 내진 RC 교각의 내진성능평가)

  • 박종협;조창백;박희상;정영수
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.452-457
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    • 2000
  • This research aims at evaluating the seismic performance of the existing R/C bridge piers, which were seismically designed in accordance with the provision of moderate confinement design code (Eurocode 8). The work presented in this paper experimentally investigates the ductility and hysteretic behavior of circular reinforced concrete columns with moderate confinement. Pseudo-dynamic tests have been carried out on two scaled R/C column specimens to investigate their hysteretic behavior and other seismic performance.

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Nonlinear Behavior Characteristics and Seismic Performance of the Existing RC Piers without Seismic Detailing (비내진 상세 기존 RC 교각의 비선형 거동특성 및 내진성능)

  • 김재관
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.327-334
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    • 2000
  • The seismic performance evaluation of the existing non-seismic detailed RC piers has risen as urgent task for rational and cost-effective seismic retrofitting works as well as development of new seismic design concept. The scale model test has been conducted to investigate nonlinear behavior characteristics and the seismic performance of existing piers with lap-spliced longitudinal reinforcements in the plastic hinge zone which are of the solid circular and the hollow rectangular section. The lap splice in this zone is found to cause premature bond failure. The experimental results show very poor seismic performance of circular section pier but relatively large ductility of the rectangular one.

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Seismic Performance Evaluation of Building Structures Using Modified Capacity Spectrum (수정된 능력스펙트럼을 이용한 건축구조물의 내진성능평가)

  • 최원호
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.267-274
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    • 2000
  • Current seismic design codes for building structures are based on the method which can provide enough capacity to satisfy objected performance level and exactly evaluate the seismic performance of buildings. The capacity spectrum method using the nonlinear static(pushover) analysis is becoming a popular tool for evaluating the seismic performance of existing and new building structures. By means of a graphical procedure capacity spectrum method esimates the performance level of structure by comparing the capacity of structure with the demand of earthquake ground motion on the structure. In the method the relation between base shear estimated by a nonlinear static analysis and horizontal displacement is used. Capacity spectrum is usually expressed as what represent the responses of the equivalent single degree of freedom (ESDOF) system for the building structures. However there are some problems in converting procedures into ESDOF system which include not considering the effect of higher modes of structures. The objective of this paper is to compare and verify existing methods and suggest the modified capacity spectrum for seismic performance evaluation of building structures.

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Ductility Demand-Based Seismic Design and Seismic Performance Evaluation of Urban Railway Bridge Pier (도시철도 고가교 및 교량 교각의 연성도 내진설계와 내진성능 평가)

  • Park, Seung-Hee;Nam, Min-Jun;Yoon, Jong-Ku;Kim, Jin-Ho
    • Proceedings of the KSR Conference
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    • pp.1220-1226
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    • 2011
  • The purpose of this study is to assess the seismic performance of a reinforced concrete pier using ductility demand-based seismic design method and nonlinear earthquake analysis. A computer program named MIDAS/Civil(MIDAS IT,2009) for the analysis of the reinforced concrete pier was used. The bridge pier was designed by the ductility demand-based seismic design. In addition, a seismic performance was evaluated through both capacity spectrum method and nonlinear time history method. In order to determine the seismic performance of the bridge pier, the maximum response values from the capacity spectrum method and nonlinear time history analysis were compared each other.

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Seismic performance evaluation using capacity spectrum method of bridge retrofitted with isolators (능력스펙트럼을 이용한 지진격리교량의 내진성능평가)

  • 김민지;한경봉;박선규
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.129-134
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    • 2002
  • The seismic performance evaluation and retrofit process are very important for old bridge. If the result is not appropriate, a retrofit process requires. Among the various retrofit methods, this paper selects a seismic isolator and evaluates a seismic performance of bridge. In case of applied seismic isolators to bridge, it proved that seismic capacity is increased by isolators A period of bridge is increased, and a seismic response is decreased. A method of evaluation is capacity spectrum method. By means of a graphical procedure, capacity spectrum estimates a performance level of structure by comparing the capacity of structure with the demand of earthquake ground motion on the structure. The objective of this study is to compare a seismic performance of a non-seismic designed bridge and seismic isolated bridge and to verify a effect of seismic isolator

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Seismic Performance Evaluation According to Seismic Retrofit Techniques of Existing School Buildings (기존 학교건축물의 내진보강기법에 따른 내진성능평가)

  • Kang, Jong
    • Journal of the Korean Society of Industry Convergence
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    • v.15 no.1
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    • pp.29-36
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    • 2012
  • Reinforced concrete shear walls and X-type steel braces were applied in seismic retrofit techniques for seismic performance evaluation of school buildings constructed in accordance with standard design announced by the ordinance of the ministry of construction in 1980s. Seismic performance evaluation was based on FEMA 356 using response spectrum as elastic analysis and conducted to pushover analysis with nonlinear static analysis. The maximum displacement ratio between floors in 4th and 3rd floors of the existing school buildings was less than 1.0%, which was functioning level in FEMA 356. However, because plastic hinge occurs somewhat in structural members according to the results of pushover analysis, partial reinforcement will be required. X-direction of the maximum lateral displacement of reinforced concrete shear walls than X-type steel braces was 45% and 32% in 4th and 3rd floors of school buildings, and Y-direction was 18% and 17%, respectively.

Seismic Performance Evaluation of Circular RC Bridge Piers with Various Steel Type (원형 실물 철근 콘크리트 교각의 철근 상세에 따른 내진성능 평가)

  • 정영수;박진영;이재훈;조대연;이대형
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.965-970
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    • 2001
  • The object of this research is to evaluate the seismic performance of existing RC bridge piers that were constructed before the adoption of the seismic design provision of Korea Bridge Design Specification in 1992. In this research, adopted test parameters were limited ductile design or non-seismic design, aspect ratio, confinement steel type, loading pattern, lap-spliced ratio for longitudinal reinforcement. This study has been performed to verify the effect of test parameter by quasi-static test. Quasi-static test has been done to investigate the physical seismic performance of RC bridge piers, such as lateral force-displacement hysteretic curve, envelope curve etc. It has been observed that seismic performance of lap-spliced test specimen, non-seismically designed specimens, was significantly reduced.

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