• Title/Summary/Keyword: 조적채움벽 골조

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A Comparison Study of Equivalent Strut Models for Seismic Performance Evaluation of Masonry-Infilled Frame (조적채움벽 골조의 내진성능평가를 위한 등가 스트럿 모델의 비교연구)

  • Yu, EunJong;Kim, MinJae;Jung, DaeGye
    • Journal of the Earthquake Engineering Society of Korea
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    • v.18 no.2
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    • pp.79-87
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    • 2014
  • Masonry-infilled walls have been used in reinforced concrete(RC) frame structures as interior and exterior partition walls. Since these walls are considered as nonstructural elements, they were only considered as additional mass. However, infill walls tend to interact with the structure's overall strength, rigidity, and energy dissipation. Infill walls have been analyzed by finite element method or transposed as equivalent strut model. The equivalent strut model is a typical method to evaluate masonry-infilled structure to avoid the burden of complex finite element model. This study compares different strut models to identify their properties and applicability with regard to the characteristics of the structure and various material models.

Dynamic Properties of a Lowrise Masonry-infilled RC Frame Building Before and After Seismic Retrofit (저층 조적채움벽 철근콘크리트 골조의 내진보강 전후 동특성 변화)

  • Yu, Eunjong;Kim, Min-Jae;Kim, Seung-Nam;Kim, Ji-Young;Choi, Ki-Sun
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.3
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    • pp.293-300
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    • 2015
  • In this study, a series of forced vibration testing and ambient vibration measurement were performed at a lowrise masonry-infilled reinforced concrete frame structure before and after seismic retrofit and its dynamic properties were extracted using system identification techniques. Also, analytical models which show similar dynamic properties to the measures ones were constructed. The system identification results showed that damping ratios in x direction along which the dampers were installed has been increased. From the comparison between the analytical models, the effective stiffness of post-installed member and post-reinforced members(shear walls and damper frames) were only 50% of gross sectional stiffness of the members, which indicates that the these members were not fully integrated with the existing structure or members. In addition, support condition of post-installed footing has to be pinned in y direction to match the dynamic properties, which is seemingly caused by the change of fixity of the soil due to the installation of new footing.

Seismic Performance of Lead-Rubber-Dampers Attached on Building Exterior (외부 부착형 납고무감쇠기의 제진성능)

  • Jeon, Seong-Ha;Park, Ji-Hun
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.29 no.12
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    • pp.3-11
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    • 2013
  • New detail of lead rubber bearing installed between an existing building structure and an added steel frame for seismic retrofit is proposed and verified. Dependency of the damper's characteristics on deformation amplitude and frequency is evaluated through cyclic loading tests. The elastic stiffness, yield displacement and post-yield stiffness ratio of the bi-linear model based on experimental force-displacement relationship have considerable dependency on amplitude and frequency. Bi-linear models of the test specimen is applied to the numerical analysis of an existing masonry-infilled RC frame. Proposed installation scheme of lead rubber bearing mitigates displacement response of the RC frame effectively below collapse margins determined from a nonlinear pushover analysis, and shows slightly dependency of the seismic performance on the idealized model characteristics.

Finite Element Analysis of Reinforced Concrete Masonry Infilled Frames with Different Masonry Wall Thickness Subjected to In-plane Loading (채움벽 두께에 따른 철근콘크리트 조적채움벽 골조의 면내하중에 대한 유한요소해석)

  • Kim, Chungman;Yu, Eunjong;Kim, Minjae
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.29 no.1
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    • pp.85-93
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    • 2016
  • In this study, finite element analyses of masonry infilled frames using a general purpose FE program, ABAQUS, were conducted. Analysis models consisted of the bare frame, infilled frames with masonry wall thickness of 0.5B and 1.0B, respectively. The masonry walls were constructed using the concrete bricks which were generally used in Korea as infilled wall. The material properties of frames and masonry for the analysis were obtained from material tests. However, four times increased the tensile strength was used for 1.0B wall, which is seemingly due to the differences in locating the bricks. The force-displacement relation and development of crack from the FE analysis were very similar to those from the experiments. From the FEA results, contact force between the frame and masonry, distribution of shear force and bending moments in frame members were analyzed. Obtained contact stress shows a trianglur distribution, and the contact length for 0.5B speciment and 1.0B specimen were close to the value estimated using ASCE 41-06 equation and ASCE 41-13 equation, respectively. Obtained shear force and bending moment distribution seems to replicate actual behavior which originates from the contact stress and gap between the frame and masonry.