• Title/Summary/Keyword: strut models

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Seismic Performance Evaluation of Masonry-Infilled Frame Structures using Equivalent Strut Models (등가 스트럿 모델을 이용한 조적조 채움벽 골조의 내진성능평가)

  • Park, Ji-Hun;Jeon, Seong-Ha;Kang, Kyung-Soo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.16 no.1
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    • pp.47-59
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    • 2012
  • The seismic performance of masonry-infilled frame structures, typical in school buildings, is evaluated through equivalent strut models. A bare frame model, concentric strut models and eccentric strut models with various material characteristics available in the literature are analyzed. Displacements and damage states at the performance points obtained by the capacity spectrum method show great differences among the models. Infill walls act positively in concentric strut models and negatively in eccentric strut models at the performance points for a given seismic demand. In addition, the behavior at the ultimate displacements shows considerably different strengths, inter-story drifts, and numbers and locations of damaged members among various modeling methods and material strengths.

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.

Numerical Simulation of the Response of a Masonry-Infilled RC Frame by Strut Models (스트럿 모델에 의한 조적채움 RC 골조의 수치적 모의)

  • 이한선;우성우
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.439-444
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    • 2003
  • The response 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, RUAUMOKO 2D. The objective of this study is to understand behavior of masonry-infilled panel and 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, stiffness and local behavior of the structure can be predicted with some reliability using this macro-model.

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Seismic response of masonry infilled RC frames: practice-oriented models and open issues

  • Lima, Carmine;De Stefano, Gaetano;Martinelli, Enzo
    • Earthquakes and Structures
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    • v.6 no.4
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    • pp.409-436
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    • 2014
  • Although it is widely accepted that the interaction -between masonry infill and structural members significantly affects the seismic response of reinforced concrete (RC) frames, this interaction is generally neglected in current design-oriented seismic analyses of structures. Moreover, the role of masonry infill is expected to be even more relevant in the case of existing frames designed only for gravitational loads, as infill walls can significantly modify both lateral strength and stiffness. However, the additional contribution to both strength and stiffness is often coupled to a modification of the global collapse mechanisms possibly resulting in brittle failure modes, generally related to irregular distributions of masonry walls throughout the frame. As a matter of principle, accurate modelling of masonry infill should be at least carried out by adopting nonlinear 2D elements. However, several practice-oriented proposals are currently available for modelling masonry infill through equivalent (nonlinear) strut elements. The present paper firstly outlines some of the well-established models currently available in the scientific literature for modelling infill panels in seismic analyses of RC frames. Then, a parametric analysis is carried out in order to demonstrate the consequences of considering such models in nonlinear static and dynamic analyses of existing RC structures. Two bay-frames with two-, three- and four-storeys are considered for performing nonlinear analyses aimed at investigating some critical aspects of modelling masonry infill and their effects on the structural response. Particularly, sensitivity analyses about specific parameters involved in the definition of the equivalent strut models, such as the constitutive force-displacement law of the panel, are proposed.

Seismic Performance Evaluation of Masonry Infilled Wall With Non-seismic Detail (비내진 상세를 가진 조적채움벽의 내진성능평가)

  • Park, Byung Tae;Kwon, Ki Hyuk
    • Journal of the Korean Society of Safety
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    • v.32 no.1
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    • pp.66-74
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    • 2017
  • Masonry walls which are commonly used for partitions in low-rise reinforced concrete (RC) structures, can be easily exposed to high risks under strong earthquakes. Since the strength degradations cannot be protected under the ground motions, their applications cannot be recommended for building structures which are designed to possess high seismic performances. However, masonry-infilled walls are typically considered as non-structural elements in evaluating the seismic performance of building structures. In order to figure out this problem, this study performed experiments using two specimens-only RC frame and RC frame infilled with masonry walls- under static loading. Also, the study established analytical models representing fully infilled frames and bare frame, and compared their structural behavior with test results. In addition, analytical model representing partially infilled frames was established and analyzed. Test results indicated that strength and energy dissipating capacity were increased for IW-RN(fully infilled frames) compared to the NW(bare frame). The nonlinear static analysis of the three specimens was also conducted using the inelastic plastic hinge frame element and diagonal strut models, and the analytical results successfully simulated the nonlinear behaviour of the specimens in accordance with the test results.