• Title, Summary, Keyword: 모서리 기둥

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Effective Compressive Strength of Corner Columns with Intervening Normal Strength Slabs (일반강도 슬래브로 간섭받은 모서리 기둥의 유효압축강도)

  • Lee, Joo-Ha
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.3
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    • pp.122-129
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    • 2015
  • In this study, a prediction model for the effective compressive strength of corner columns with intervening normal strength concrete slabs was developed. A structural analogy between high-strength concrete column-normal strength concrete slab joint and brick masonry was used to develop the prediction model. In addition, the aspect ratio of slab thickness to column dimension was considered in the models. The reliability of the new prediction model was evaluated by comparison with experimental results and its superiority was demonstrated by comparison with previous models proposed by design codes and other researchers. As a result, with average test-to-predicted ratios of 1.09, a standard deviation of 0.15, the newly developed equation provided superior predictions in terms of accuracy and consistency over all of the existing effective strength prediction approaches including KCI structural concrete design code (2012).

Energy Absorption of Collision Post Based on North American CFR Regulations for Railway Vehicles (철도차량의 북미 CFR 법규에 대한 충돌 기둥에너지 흡수에 관한 연구)

  • Kim, Seung-Tech;Jeong, Ji-Ho;Choi, Jeong-Yong;Woo, Kwan-Je
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.8
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    • pp.935-943
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    • 2012
  • In accidents involving the collision of railway vehicles, there is a risk that structural members might penetrate the cab frame of the railway vehicle in the space in which the driver or passengers are seated. To reduce this risk, worldwide, studies on the collision of railway vehicles are underway. In North America, the Code of Federal Regulations (CFR) was revised in 2010 to include crush criteria for a collision and the corner post in an end frame. In this study, a crush analysis and crush test for a collision post and a crash analysis for a rigid cylinder were performed according to the CFR. The analysis and test results were compared and reviewed. This study aims to determine the usefulness of crush analysis for developing various end frames, and to understand the crush and crash characteristics and review the accuracy of the analysis.

Evaluation of Blast Resistance of Slab-Column Connections According to the Confinement Effects and Drop Panel (슬래브-기둥 접합부의 구속도 및 드롭패널에 따른 방폭 성능 평가)

  • Lim, Kwang Mo;Lee, Joo Ha
    • Journal of The Korean Society of Civil Engineers
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    • v.37 no.2
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    • pp.451-457
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    • 2017
  • The numerical analysis was conducted to evaluate the behavior of slab-column connection subjected to blast loads using LS-DYNA. The typical form of slab-interior column connection for analysis was considered as a reference specimen and the drop panel slab-interior column was designed to verify the effects of drop panel. The slab-column connections, which were composed of interior, edge and corner column, were additionally analyzed to compare their confinement effects of specimens. Analysis results were contained the failure shape of connection, behavior of member and so on. From the results, the blast-resistant capacities of slab-column connection would be enhanced by reinforcing the drop panel. In addition, the performance of connections could be improved, when the confinement effects were enhanced.

Earthquake Resistance of Beam-Column Connection of Precast Concrete U-Shaped Shell Construction (프리캐스트 콘크리트 U형 쉘 공법 보-기둥 접합부의 내진성능)

  • Im, Hyeong-Ju;Park, Hong-Gun;Eom, Tae-Sung;Kang, Su-Min
    • Journal of the Korea Concrete Institute
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    • v.22 no.6
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    • pp.741-751
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    • 2010
  • An experimental study was performed to investigate the earthquake resistance of the beam-column connections as a part of a precast concrete moment-resisting frame that uses precast concrete U-shaped shells for the beams. Five full-scale precast concrete specimens and one conventional monolithic concrete specimen were tested under cyclic loading. The parameters for this test were the reinforcement ratio, stirrup spacing, and end-strengthening details of the precast beam shell. The test results showed that regardless of the test parameters, the precast concrete beam-column connections showed good load-carrying capacity and deformation capacity, which were comparable to those of conventional monolithic concrete specimen. However, at large deformations, the beam-column connections of the precast concrete specimens were subjected to severe strength degradation due to diagonal shear cracks and the bond-slip of re-bars at the joint region. For this reason, the energy dissipation capacity and stiffness of the precast concrete specimens were significantly less than those of the cast-in-place specimen.

Numerical Analysis on Structural Behavior of Column-Slab Connection (기둥-슬래브 접합부의 구조거동에 관한 수치해석)

  • Lee, Joo-Ha;Lim, Kwang-Mo;Lee, Byung-Soo
    • Journal of the Korea Concrete Institute
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    • v.29 no.1
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    • pp.77-84
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    • 2017
  • In this study, the structural performance of high strength concrete (HSC) column-normal strength concrete (NSC) slab connection was investigated according to confinement effects, aspect ratio (h/c) and strength ratio ($f^{\prime}_{cc}/f_{cs}$). The study was conducted by using finite element analysis. To verify the analysis methods, the experiments and analyses results were compared. The specimens were classified by connection types including interior column, edge column, corner column and isolated column. As a result, ultimate strength of interior column was larger than other specimens. Also, the axial stresses of connection were decreased when the aspect ratio was increased. As the strength ratio between column and slab was increased, the ultimate strength of specimens was also increased until the strength ratio was reached to 1.83.

Seismic Performance of Wide Flange Beam-to-Concrete Filled Tube Column Joints with Stiffening Plates around the Column (사각판 스티프너로 보강한 콘크리트 충전강관 기둥과 H형강 보 접합부의 내진성능)

  • Park, Jong Won;Kang, Seoung Min;Kim, Wook Jong
    • Journal of Korean Society of Steel Construction
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    • v.15 no.2
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    • pp.167-174
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    • 2003
  • This paper presented the results of cyclic loading tests of 7 full-scale beams to column subassemblages with improved connection detail i.e., fillets of the stiffening plates at the column corners and ends of the stiffener-to-beam flange weld. Major findings from the test results were: (1) Fillets reduced the stress concentrations that may cause early brittle fractures and considerably improved the cyclic performance compared to the detail without fillets. (2) As the width of the stiffening plate increased, the stiffness and peak strength increased and energy dissipation capacity decreased. (3) While all specimens failed by a fracture, they could develop a total rotation of 0.04 radian required for special moment resisting frames.

Spatting and Fire Enduring Properties of High Strength RC Column Subjected to Axial Load Depending on Fiber Contents (중심 축하중을 받는 고강도 RC기둥의 섬유 혼입량에 따른 폭열 및 내화 성상)

  • Han, Cheon-Goo;Hwang, Yin-Seong;Lee, Jae-Sam;Kim, Kyoung-Min
    • Journal of the Korea Concrete Institute
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    • v.18 no.1
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    • pp.83-90
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    • 2006
  • This paper investigates experimentally the fire resistance performance and spatting resistance of high performance reinforced concrete column member subjected to fire containing polypropylene fiber(PP fiber) and cellulose fiber(CL fiber). An increase in PP fiber and CL fiber contents, respectively resulted in a reduction of fluidity due to fiber ball effect. Air content is constant with m increase in fiber content. Compressive strength reached beyond 50 MPa. Based on fire resistance test, severe failure occurred with control concrete specimen, which caused exposure of reinforcing bar. No spall occurred with specimen containing PP fiber. This is due to the discharge of internal vapour pressure. Use of CL fiber superior to control concrete in the side of spatting resistance, localized failure at comer of specimen was observed. Corner of specimen had deeper neutralization than surface of specimen. Specimen containing PP fiber had the least damaged area due to spatting. Neutralization depth ranged between 6 and 8 mm Residual compressive strength of specimen containing PP fiber maintained 40%, which is larger than control concrete with 20% of residual strength. Specimen containing CL fiber had 25% or residual strength.

Eccentric Axial Loading Test for Concrete-Encased L-section Columns using 800MPa Steel and 100MPa Concrete (800MPa 강재 및 100MPa 콘크리트를 적용한 ㄱ형 강재 매입형 합성기둥의 편심압축실험)

  • Kim, Chang-Su;Park, Hong Gun;Lee, Ho Jun;Choi, In Rak
    • Journal of Korean Society of Steel Construction
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    • v.25 no.2
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    • pp.209-222
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    • 2013
  • Eccentric axial loading test was performed for concrete-encased columns using 800MPa steel and 100MPa concrete. To maximize the contribution of the high-strength steel, L-shaped steel sections were placed at four corners, and connected to each other by lattices, links, or battens. Compared to a H-section of the same area, the moment-arm and strain of the L-sections are increased. Also, the corner L-sections provide good lateral confinement to concrete core. The test results showed that the peak strength and effective flexural stiffness of the L-section columns were increased by more than 1.4 times those of the H-section column.

Economic Analysis for Warehouse Rental Using Underground Parking Lots Extra Storage Room of Rental Office (임대오피스 지하주차장 여유공간을 활용한 임대창고의 경제성 분석)

  • Lee, Hwan-Cheol;Song, Byung-Doo;Hong, Tae-Hoon;Hyun, Chang-Taek;Moon, Hyun-Seok
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • pp.877-882
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    • 2008
  • The column gap of underground parking lots of office considering a business background and effective parking divisions is planned. A parking plan by column gap of fixed forms in atypical underground parking lots makes much extra storage rooms. Most of the edge of the parking lots are used for fan room. Part of the edge are located at parking ramps. Also warehouses are located in extra storage rooms. In this study compare study economical efficiency between life cycle costs and leases earnings. Consequently, It is proved that the warehouse rental is efficient because of lease earning guaranted years.

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