• 제목/요약/키워드: 모멘트골조

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철근 콘크리트 보통모멘트골조 기둥의 구조성능평가 (Performance Evaluation of Columns in Ordinary Moment Resisting Concrete Frames(OMF))

  • 한상환
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 2000년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2000
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    • pp.192-197
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    • 2000
  • The purpose of this study is to investigate the capacity of columns in the Ordinary Moment Frame (OMF). For this purpose, 3-story building was designed according to Uniform Building Code and ACI building Code.(ACI 318-99) The columns were classified into interior and exterior columns. For each interior and exterior columns, upper and lower parts are modeled by the 2/3 scale experimental specimens. The specimens for lower part columns have lap splice. The interior columns were tested under the constant axial force, while the exterior columns were tested under the fluctuating axial force. Based on the results of the experiments, the conclusion for the capacity of the column is proposed.

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내진설계에서 사용한 해석방법이 철골 특수모멘트골조의 붕괴위험도에 미치는 영향 평가 (Effect of Analysis Procedures on Seismic Collapse Risk of Steel Special Moment Frames)

  • 김태오;한상환
    • 한국지진공학회논문집
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    • 제24권6호
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    • pp.243-251
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    • 2020
  • In seismic design standards such as KDS 41 17 00 and ASCE 7, three procedures are provided to estimate seismic demands: equivalent lateral force (ELF), response spectrum analysis (RSA), and response history analysis (RHA). In this study, two steel special moment frames (SMFs) were designed with ELF and RSA, which have been commonly used in engineering practice. The collapse probabilities of the SMFs were evaluated according to FEMA P695 methodology. It was observed that collapse probabilities varied significantly in accordance with analysis procedures. SMFs designed with RSA (RSA-SMFs) had a higher probability of collapse than SMFs designed with ELF (ELF-SMFs). Furthermore, RSA-SMFs did not satisfy the target collapse probability specified in ASCE 7-16 whereas ELF-SMFs met the target probability.

보-기둥 접합부를 가진 철근 콘크리트 모멘트 골조의 비탄성 회전 능력에 대한 평가 (Performance Evaluation of Inelastic Rotation Capacity of Special Moment Frame Connections)

  • 이기학
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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    • pp.688-691
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    • 2004
  • This study summarizes results of a research project aimed at investigating the inelastic rotation capacity of beam-column joints of reinforced concrete moment frames. A total of 28 specimens were classified as special moment frame connections based on the design and detailing requirements in the ACI 318-99 provisions. Then, the acceptance criteria, originally defined for steel moment frame connections in the AISC-97 Seismic Provisions, were used to evaluate the joint connections of concrete moment frames. Twenty seven out of 28 test specimens that satisfy the design requirements for special moment frame structures provided sufficient strength and are ductile up to a plastic rotation of $3\%$ without any major degradation in strength.

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Reduced Beam Section을 가진 철골모멘트 골조의 효율적인 비탄성 해석 (An Efficient Inelastic Analysis of a Moment Frame Steel Structure with Reduced Beam Section)

  • 조소훈;박찬헌;이동근
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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    • pp.503-510
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    • 2004
  • One of the methods improving the seismic behavior of a structure is the frame with reduced beam section (RBS) which cuts a segment of flanges of the beam near the beam-to-column connection so that the section with reduced flanges has smaller flexural strength than the beam end. It is difficult to analyze the RBS frame because RBS portion has circular-cut type flange. And inelastic response of the steel frame with the RBS is very sensitive to the RBS model. In this paper, the analytical models of RBS portion are investigated and the results of the inelastic analysis for RBS analytical models are compared and then the analytical model for RBS is determined based on the results of inelastic analysis. Inelastic behavior of the RBS frame and its dynamic characteristics are investigated for selected analytical model of RBS.

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철근콘크리트 보통모멘트 골조의 슬래브-보-기둥 부재의 구조성능 평가 (Structural Performance Evaluation of Slab-Beam-Column Subassemblage in R/C Ordinary Moment Frame Building)

  • 유혁상;한상환;이리형
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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    • pp.757-762
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    • 2000
  • The purpose of this study is to investigate the performance of slab-beam-column subassemblage in the Ordinary Moment Frame(OMF). For this purpose, 3-story building was designed according to UBC and ACI building code(ACI 318-99) and the subassemblages of in the first story were constructed. The subassemblages were classified into interior and exterior. Each interior and exterior subassemblage is modeled by the 2/3 scale experimental specimens. All the specimens have the transverse beam and the columns on the slab have the lap splice as the typical exterior and interior slab-beam-column subassemblage. The interior subassemblage was tested under the constant axial force, while the exterior subassemblage was tested under the fluctuating axial force. Based on the results of the experiments, the performance of each subassemblage is evaluated and the failure mode is investigated.

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철근 콘크리트 보통 모멘트 골조 기둥의 거동평가 (Seismic Behaviors of OMRCF Columns)

  • 한상환;이리형
    • 콘크리트학회논문집
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    • 제14권2호
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    • pp.199-206
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    • 2002
  • The objective of this study is to investigate the seismic behavior and evaluate structural performance of columns in Ordinary Moment Resting Concrete Frames (OMRCF). For this purpose 3 story OMRCF building was designed and detailed in compliance to ACI 318 (1999). Only gravity load is considered for the design. It is important to note that details strongly relate to the structural performance. The 1st story columns in the 3 story building are considered in this study since 다lese columns shall resist the largest axial and lateral forces during an earthquate. Four test specimens were made for representing the upper part and lower part of exterior and interior columns. All specimens are two-third scale. Based on the test results this study estimates deformation, ductility, strength, and energy absorption capacities as well as plastic hinge length.

복합 슬릿-마찰 감쇠장치가 적용된 철근 콘크리트 특수 모멘트 저항골조의 내진성능 평가 (Seismic Performance Evaluation of Special Reinforced Concrete Moment Resisting Frames With Hybrid Slit-Friction Damper)

  • 이준호;김기철;김진구
    • 한국공간구조학회논문집
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    • 제17권4호
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    • pp.35-42
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    • 2017
  • This study develops a new hybrid passive energy dissipation device for seismic rehabilitation of an existing structure. The device is composed of a friction damper combined with a steel plate with vertical slits as a hysteretic damper. Analytical model is developed for the device, and the capacity of the hybrid device to satisfy a given target performance is determined based on the ASCE/SEI 7-10 process. The effect of the device is verified by nonlinear dynamic analyses using seven earthquake records. The analysis results show that the dissipated inelastic energy is concentrated on the hybrid damper and the maximum interstory drift of the SMRF with damping system satisfies the requirement of the current code.

헌치로 보강된 철골모멘트 골조의 지진 응답: 사례연구 (Seismic Response of Haunch Repaired Steel MRFs: A Case Study)

  • 이철호
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 1997년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Fall 1997
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    • pp.173-181
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    • 1997
  • To investigate the effects of haunch repair on the system seismic performance of steel moment-resisting frames (steel MRFs), a case study was conducted for a 13-story frame damaged during the 1994 Northridge earthquake. It was assumed that only those locations with reported damage would be repaired with haunches. A new analytical modeling technique for the dual panel zone developed by the author was incorporated in the analysis. Both the inelastic static and dynamic analyses did not indicate detrimental side effects resulting from the repair. As a result of the increased strength in dual panel zones, yielding in these locations were eliminated and larger plastic rotation demand occurred in the beams next to the shallow end of the haunches. Nevertheless, the beam plastic rotation demand produced by the Sylmar record of 1994 Northridge earthquake was still limited to 1.7% radians. The repair resulted in a minor increase in earthquake energy input. In the original structure, the panel zones should dissipate about 80%(for the Oxnard record) and 70%(for the Sylmar record) of the absorbed energy, assuming no brittle failure of moment connections. After repair, the energy dissipated in the panel zones and beams were about equal.

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PSC 연속 평판슬래브의 지점 부모멘트 산정법 연구 (A Study on the New Computational Methods for the Negative Moment at Column Support in PSC Flat Plate)

  • 박선규;이범식;한만엽
    • 전산구조공학
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    • 제11권4호
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    • pp.177-186
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    • 1998
  • PSC 연속 평판슬래브의 설계는 부정정 평판슬래브에 대한 정확한 해석의 어려움 등으로 등가보이론과 등가골조이론에 의한 근사식을 수정없이 사용하거나 컴퓨터를 이용한 해석에 의존하고 있으나 해석결과를 간단하게 정확히 평가할 수 있는 기법은 없는 실정이다. 또한 PSC 연속 평판슬래브의 부재력은 긴장재의 곡선형태에 따라 변하므로 실제 설계시 PS 긴장재의 정확한 곡선식을 찾는 것은 매우 중요하다. 본 연구에서는 비부착 PSC 연속 평판슬래브를 설계할 때 기둥과 기둥을 연결하는 PS 긴장재의 기하학적 곡선형태를 결정하는 방법과, PS 긴장력으로 인해 발생하는 평판슬래브의 기둥부 휨모멘트에 대하여 판이론을 기초로 간편하게 계산하는 방법을 제안하였다. 본 연구에서 제안된 이론으로 계산된 PSC 연속 평판슬래브에 대한 해석값과 유한요소 해석에 의한 지점 부모멘트를 비교 검토하여, 본 논문에서 제시한 기법의 타당성을 입증하였다. 따라서 본 연구는 설계자에게 컴퓨터의 해석결과를 간단하고 정확하게 검증할 수 있도록 하였다.

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철골모멘트골조의 비선형 정적 연쇄붕괴 근사해석 (Simplified Nonlinear Static Progressive Collapse Analysis of Steel Moment Frames)

  • 이철호;김선웅
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2007년도 정기 학술대회 논문집
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    • pp.698-703
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    • 2007
  • A simplified model which incorporates the moment-axial tension interaction of the double-span beams in a column-removed steel frame is presented in this paper. To this end, material and geometric nonlinear parametric finite element analyses were conducted for the double-span beams by changing the beam span to depth ratio and the beam size within some practical ranges. The beam span to depth ratio was shown to be the most influential factor governing the catenary action of the double-span beams. Based on the parametric analysis results, a simplified piecewise linear model which can reasonably describe the vertical, resisting force versus the beam chord rotation relationship was proposed. It was also shown that the proposed method can readily be used for the energy-based progressive collapse analysis of steel moment frames.

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