• Title/Summary/Keyword: RC골조

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Shear Strength of Retrofitted RC Squat Wall by Additional Boundary Element (단부 증타 보강된 RC 전단벽체의 전단강도)

  • Yi, You-Sun;Hong, Sung-Gul;Park, Young-Mi
    • Journal of the Korea Concrete Institute
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    • v.27 no.5
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    • pp.489-499
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    • 2015
  • This study suggested shear strength prediction model for retrofitted single-layered RC squat wall by providing column element as additional boundary element. This model revised existing shear strength prediction model of shear wall to consider detail and shear deformation capacity of column by assuming the length that concentrated shear deformation of the column is occurred. It was able to suggest additional compatibility condition related to shear strain of retrofitted of retrofitted shear wall at the ultimate state by using this length. Therefore, this study proposed a flow chart for predicting shear strength of the retrofitted shear wall considering this additional condition. Moreover, this study also proposed a method for predicting initial stiffness of the retrofitted shear wall by transforming the wall's resisting mechanism against to lateral load to a single diagonal strut mechanism. The proposed methods can predict shear strength and initial stiffness of not only the retrofitted shear wall of this study, also infilled RC shear wall in RC frame.

Construction Sequential Analysis on RC Building Structure considering Temperature Changes (외부 온도변화를 고려한 RC 건축구조물의 시공단계해석)

  • Kang, Su-Min;Oh, Jae-Keun;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.229-232
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    • 2008
  • In rapid cycle construction, RC structure which is not cured fully can be loaded with construction load and this construction load can influence on the safety of construction and cracks on slabs. Therefore, to reduce the term of construction, the safety of construction and prevention of cracks should be assured against construction load. In the previous study, temperature load can significantly influence on the behavior of structure under construction. However, existing construction sequential analysis or design code do not consider temperature load reasonably. In the present study, through construction sequential analysis method using FE analysis, the behavior of structure under construction was analyzed according to temperature changes. According to the results of analysis, as the temperature falls, shoring load drops and the temperature rises, shoring load rises. These variations of shoring load can affect the safety of construction. Moment of slab goes up by fall in temperature. This increase of moment can cause cracks on the slab. Therefore to assure the safety on construction and prevent cracks on slabs, temperature load has to be considered reasonably in construction sequential analysis.

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Nonlinear Behavior of Seismic-Strengthened Domestic School Building (국내 기존 학교건축물의 내진보강 후 비선형 거동특성)

  • Ryu, Seung Hyun;Yun, Hyun Do;Kim, Sun Woo;Lee, Kang Seok;Kim, Yong Cheol
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.1
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    • pp.243-253
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    • 2011
  • This paper describes an analytical study on seismic performance of domestic reinforced concrete (RC) school building not designed by seismic provision. The seismic index and the seismic performance of the building were evaluated through Japanese standard and Midas Gen, respectively. Seismic index (Is) of the RC school buildings in the X-direction is below 0.4. Based on the seismic index, for seismic-strengthening the building, infill shear wall or steel brace with a capacity of 1,300 kN was used. According to nonlinear static analysis results, the contribution of the seismic-strengthening to the shear resistance of the school building was measured to be greater than 30%. However, as expected, shear strength of school building strengthened with infill wall dropt rapidly after peak load and much narrower ductile behavior range was observed compared to steel brace strengthened building. Also, the building strengthened with steel brace showed 30% larger spectral displacement than that strengthened with infill shear wall. In nonlinear dynamic analysis, for the time history analysis, the maximum displacement showed tendency to decrease as amount of reinforcement increased, regardless of strengthening method. It was recommended that variable soil properties and earthquake record should be considered for improving seismic performance of buildings in seismic zone.

Study of Inelastic Responses of a 1:12 Scale 10-Story R.C. Frame-Wall Structure (1:12축소 10층 R.C. 골조-벽식 구조의 비선형 거동 연구)

  • 이한선;김상호;유은진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.867-872
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    • 2000
  • A 1:12 scale 10-story RC building structure was constructed and the experiment was performed. The test results are presented and compared with the results of the analysis conducted with DRAIN-2DX. It is concluded that some local deformations cannot be described reasonably with the wall model using only Plastic Hinge Beam-Column Element(TYPE02) in DRAIN-2DX whereas the strength and stiffness of the whole structure can be predicted with high reliability.

The Response Characteristics of Approximate Nonlinear Methods with RC Dual System (이중골조에 대한 비선형 약산법들의 응답특성)

  • Nam Young-Woo;Kang Pyeong-Doo;Jun Dae-Han;Kim Jae-Ung
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2005.04a
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    • pp.71-78
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    • 2005
  • In performance-based design methods, it is clear that the evaluation of the nonlinear response is required. The methods available to the design engineer today are nonlinear tim history analyses, or monotonic static nonlinear analyses, or equivalent static analyses with simulated inelastic influences. The nonlinear time analysis is the most accurate method in computing the nonlinear response of structures, but it is time-consuming and necessitate more efforts. Some codes proposed the capacity spectrum method based on the nonlinear static analysis to determine earthquake-induced demand given the structure pushover curve. This procedure is conceptually simple but iterative and time consuming with some errors. The nonlinear direct spectrum method is proposed and studied to evaluate nonlinear response of structures, without iterative computations, given by the structural linear vibration period and yield strength from the pushover analysis. The purpose of this paper is to compare the accuracy and the reliability of approximate nonlinear methods with respect to RC dual system and various earthquakes.

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A Study of Correlation between Experiment and Analysis of Nonlinear Behaviors of A 1:5 Scale RC Frame with Nonseismic Details (비내진 상세를 가진 1:5 축소 철근콘크리트 골조의 비선형 거동에 대한 실험과 해석의 상관성 연구)

  • 이한선;우성우;허윤섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.483-486
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    • 1999
  • A series of dynamic and static tests were conducted to observe the actual responses of a 1:5 scale 3-story reinforced concrete (RC) frame which was designed only for gravity loads. One of the major objectives of these experiments are to provide the calibration to the available static and dynamic inelastic techniques. In this study, the experimental results were simulated by using a nonlinear analysis program for reinforced concrete frame, IDARC-2D. The evaluation of the degree of the simulation leads to the conclusion that while the global behaviors such as story drifts and shears can be in general simulated with the limited accuracy in the dynamic nonlinear analysis, it is rather easy and simple to get the fairly high level of accuracy in the prediction of global and local behaviors in the static nonlinear analysis by using IDARC-2D.

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Problems in Seismic Design of High-Rise RC Building Frame Systems (초고층 건물골조 시스템의 내진설계상 문제점)

  • Lee, Han-Seon;Jung, Sung-Wook;Ko, Dong-Woo
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2005.03a
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    • pp.195-202
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    • 2005
  • High-rise residential buildings in these days tend to adopt a building frame system as primary earthquake resisting structural system for some architectural reasons. But there exist several ambiguities in designing such building frame systems according to current codes, with regards to : the effective stiffness property of RC cracked section in static and dynamic analyses, analytical model to evaluate story drift ratio and, deformation compatibility requirements of frames. The comparative study for these issues by appling IBC 2000 and KBC 2005 to a typical building frame system shows that demands of member strength and story drift ratio can be different significantly depending on designer's interpretation and application of code requirements.

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Seismic Capacity of Reinforced Concrete Frames Retrofitted with H-beam Frame (H형강 프레임으로 보강한 철근 콘크리트 골조의 내진성능 평가)

  • Kim, Min Sook;Choi, Hosoon;Song, Seung Eon;Lee, Young Hak
    • Journal of the Earthquake Engineering Society of Korea
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    • v.17 no.3
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    • pp.127-132
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    • 2013
  • This study proposed proposes a retrofitting method using an H-beam frame to improve the seismic performance of non-seismic designed reinforced concrete frames. To evaluate the seismic performance with the H-beam frames, a cyclic lateral load test was performed and the experimental result was compared with the bared frame, and a masonry infilled RC frame. The results was were analyzed regarding aspects of the load-displacement hysteresis behavior, effective stiffness, displacement ductility, and cumulative energy dissipation. AlsoIn addition, it was possible to prove both an increase of in the maximum load capacity, effective stiffness, and energy dissipation capacity using the H-beam frame.

Development of Computing Model for the Process and Operation Interval of Reinforced Concrete Work using Web-CYCLONE (철근콘크리트 골조공사의 프로세스 및 공정 공백 산출 시뮬레이션 모형 개발)

  • Park, Sang-Min;Son, Chang-Baek;Lee, Dong-Eun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.341-343
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    • 2012
  • This study introduces a method for computation of process and operation gap in the specific construction operation(i.e., RC frame construction applying a block-grouping scheme) using CYCLONE-based simulation modeling and analysis technique. Since uncertainty of construction environment exists, a thoughtful production planning is required to effectively deal with a risk resulting in schedule delay in advance. This study presents the concepts of a time delay occurred in a process level and operation level in a operation model, and a method of measuring gap-times in each level while the simulation progresses. It helps a site manager to decide how many segmentation in a construction block is suitable for eliminating unproductive time-delays under the constrained resources (e.g., laborer, equipment). A case study presents a network model representing a three segmented RC frame work, and result obtained from the simulation experiment.

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An Analytical Study on Primary Anchor Unit for ALC Panel Curtain-wall (ALC 패널 커튼월용 부품 Primary Anchor의 해석적 연구)

  • Yoon, Myung-Ho;Ryu, Chang-Hyun
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.2 no.1
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    • pp.8-14
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    • 2011
  • This study aims at grasping the structural performances of primary anchor assemblage through a nonlinear finite element analysis. Primary anchor unit may be used as one of the connection devices between ALC panel curtain-wall and RC slab or main frame of a building. From the analytical results structural characteristics such as yield strength, initial stiffness and maximum strength are obtained and fully discussed.