• Title/Summary/Keyword: 뚫림 전단

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Experimental Study about Punching Shear Strength of Biaxial Hollow slab with Donut type Hollow Sphere (도넛형 중공형성체를 사용한 중공슬래브의 뚫림 전단 성능에 관한 실험적 연구)

  • Chung, Joo-Hong;Choi, Hyun-Ki;Lee, Seung-Chang;Choi, Chang-Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.59-60
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    • 2010
  • This paper presents the flexural capacities of biaxial hollow slab with donut type hollow sphere. To verify the punching shear capacities of this biaxial hollow slab, punching shear tests were performed. The test parameter was the areas of critical section which were determined by the number of hollow spheres in critical section.

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An Evaluation on Punching Shear Capacity of R/C Flat Plate Slab (RC 플랫 플레이트 슬래브의 뚫림전단성능평가)

  • Kim, Jong-Keun;Shin, Sung-Woo;Yang, Ji-Soo;Lee, Li-Hyung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.7 no.3
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    • pp.205-213
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    • 2003
  • The primary purpose of this study is to investigate punching shear capacity of flat plate slab using high strength concrete in column. It may be much contributed to economy efficiency and structural advantages that High Strength Concrete(HSC) used for vertical member and Normal Strength Concrete(NSC) for horizontal member. Therefore, six plate flat slab specimens with HSC column and NSC slab had been made and tested with real scale. The major variables were compressive strength of concrete(fck=285, $460kgf/cm^2$), extended length of HSC from column face and amount of shear reinforcements. As the result of this test, the maximum load and punching shear capacity of specimens is affected by extended length and shear reinforcements.

Evaluation of Shear Strength for Reinforced Flat Plates Embedded with GFRP Plates (매립형 GFRP 판으로 보강된 플랫 플레이트의 전단강도 평가)

  • Hwang, Seung Yeon;Kim, Min Sook;Lee, Young Hak;Kim, Heecheul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.27 no.2
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    • pp.121-128
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    • 2014
  • In this study, The purpose of this study is to experimentally investigate the shear behavior of reinforced flat plate embedded with GFRP(glass fiber reinforced polymer) plate with openings. The GFRP shear reinforcement is manufactured into a plate shape with several openings to ensure perfect integration with concrete. The test was performed on 7 specimens. the parameters include the type of reinforcement and amount of the shear reinforcement., From the test, we analysed the crack, failure mode, Strain, load-displacement graph. a calculation of the shear strength of reinforced flat plate with GFRP plate based on the ACI 318-11 was compared with the test results. The results of the experiment indicate that GFRP plate is successfully applied as a shear reinforcement in the flat plate under punching shear.

Punching Shear Strength of Deck Slabs Made of Ultra High Performance Concrete (UHPC 바닥판 슬래브의 뚫림전단강도)

  • Joh, Chang Bin;Kim, Byung Suk;Hwang, Hoon Hee;Choi, Kyoung Kyu;Choi, Sok Hwan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.4
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    • pp.221-231
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    • 2011
  • Thinner and lighter structural members can be designed by utilizing the high stiffness and toughness, and high compressive strength of UHPC(ultra high performance concrete), which reaches up to 200MPa. The punching shear capacity of UHPC was investigated in this paper aiming for the application of UHPC to bridge decks. Six square slabs were fabricated and punching shear test was performed under fixed boundary condition. Different thicknesses of test slabs, which were 40mm and 70mm, were selected. The shape ratio of loading plates were ranged between 1.0~2.5. 40mm thickness slabs showed longer softening region after the peak load and, on the other hand, 70mm thickness slabs revealed a more brittle shear failure. Experimental results were analyzed using various existing punching shear predicting equations. Ductal$^{(R)}$ equation and JSCE equation better predicted for 40mm slabs, and Harajli et al. equation and ACI-Ductal$^{(R)}$ equation better suited for 70mm slabs. Nevertheless generally they didn't well predict the test results. A new punching shear equation which was derived based on the actual failure mechanism was proposed. The proposed equation appeared to better predict the punching shear strength of UHPC than other available equations.

Shear Capacity of Shear Reinforcement for Punching Shear in Flat Plate Structure (플랫 플레이트 구조에서 뚫림전단에 대한 전단보강체의 보강능력)

  • Kim, Jun-Seo;Choi, Hyun-Ki;Jin, Eon-Sik;Baek, Young-Soo;Choi, Chank-Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.17-20
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    • 2008
  • As a part of a research program to study the shear reinforcement of flat plate system, this investigation aimed to determine the effect of shear reinforcement type on punching shear strength of monolithic slab-column connection. A total of 5 specimens were fabrication and tested. The dimension of the slab were $2.63{\ast}2.725{\ast}0.18m$, with a centrally located column $0.6{\ast}0.8m$ in cross section. Experimental results showed that the CFS shear reinforcement was not effective because of lack of proper bond with concrete. 3 shear reinforcement except of CFS showed high effectiveness, which resulted in a considerable increment of the punching shear resistance of the connection.

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An Experimental Study on Punching Shear at the Connection of RC Column Constrained by H-Beam with 井 Shape (정(井)자형 H형강으로 구속된 철근콘크리트 기둥접합부의 뚫림전단에 관한 실험적 연구)

  • Kim, Lyang-Woon;Lee, Soo-Kueon;Lee, Jung-Yoon;Chung, Chang-Yong;Kim, Sang-Sik
    • Journal of the Korea Concrete Institute
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    • v.21 no.3
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    • pp.319-326
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    • 2009
  • Two parallel wide flange built-up beams are widely used as struts in resisting lateral earth pressure because of the effectiveness in structure and construction. In a certain structural system, the reinforced concrete columns are to be placed at the intersection where two perpendicular beams cross each other, the square part of the joint being filled with concrete. In the punching shear mechanism of the beam-column joint, the radial deformation caused due to shear cracking will be constrained by the spring action of the squarely encompassed beam flanges. As a result, the punching shear strength of the joint concrete can be expected to be increased. To verify this phenomenon experiments have been performed for various constraining elements and distances between columns and constraints. Test results are compared with the approximation analysis formula which has been proposed in this study, based on the code formula. The results calculated by the proposed equation show comparatively close agreement with the punching shear strength detected from the test.

Evaluation of Punching Shear Safety of a Two-Way Void Plywood Slab System with Form (거푸집 패널이 부착된 2방향 중공슬래브의 뚫림 전단 안전성 평가)

  • Hur, Moo-Won;Woo, Hyung-Sik;Park, Jung-Min;Kang, Hyun-Wook;Park, Tae-Won
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.5
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    • pp.182-189
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    • 2021
  • VPS(Void Plywood Slab System, VPS) has optimized the shape of the hollow material. In addition, it has a function to prevent the floating of the hollow material and the separation due to the working load. In this study, the punching shear capacity of flat plate was performed using Void Plywood Slab System with form work panel proposed in the previous study. As a result of the test, the strength of the VSPS specimen in which the hollow material was placed beyond 2.0 times the column width from the loading point was reduced by 9.4% compared to the reference specimen. However, the strength value was about 1.57 times higher than the design value suggested by KBC 2016. It was found that there was no change in stiffness compared to the reference specimen until shear failure occurred in the VSPS specimen in which the hollow material was placed. It can be seen that this experiment is being destroyed by shear as the flexural reinforcing bars are sufficiently reinforced.

Evaluation of Punching Shear for Flat Plates Using GFRP Plate Shear Reinforcement (GFRP 판을 전단보강재로 사용한 플랫 플레이트의 뚫림전단 성능 평가)

  • Lee, Young Hak;Kim, Min Sook;Hwang, Seung Yeon;Choi, Jinwoong;Kim, Heecheul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.27 no.5
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    • pp.413-420
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    • 2014
  • The purpose of this study is to experimentally investigate the shear behavior of flat plate that reinforced by embedded GFRP(glass fiber reinforced polymer) plate with openings. Shape of the GFRP shear reinforcement is a plate with several openings to ensure perfect integration with concrete. The test was performed on 7 specimens to check shear strength of flat plate that reinforced by GFRP plate. The parameters include the spacing of the shear reinforcement and amount of the shear reinforcement. The result of test showed that when amount of shear reinforcement was increased, shear strength improved. The result of test showed that maximum shear strength was confirmed when spacing of shear reinforcement was 0.3d. The calculation of the shear strength of reinforced flat plate with GFRP plate based on the KCI was compared with the test results.

A Study on Punching Shear of Column-Foundation Joint Connection for Reinforced Steel Base Plate (Base Plate로 보강된 기둥-기초 접합부의 뚫림전단강도 연구)

  • Kim, Seong-Kyum;Park, Jong-Kwon;Han, Sang-Hee;Kim, Byung-Cheol;Jang, Il-Young
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.2
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    • pp.1-9
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    • 2015
  • In this paper, the RC column-based joint connection part carry out loading test by reinforced hollow or extended Base Plate in order to confirm that RC joint punching shear reinforcement effect of applying the Base Plate. Base Plate thickness, extension length, size, and type as the variable, Base Plate suitable for the stress distribution and shape and dimensions confirmed through experiment and then reinforcing effect was analyzed. Experimentally, vertical load transmitted to the Base Plate from column to foundation is effective to stress distribution and then, type of hollow reinforcement more efficient than a closed. Through experiment, improve performance and ductility due to reinforcement and relative to the thickness of the existing foundation reduced even showed better performance than the existing. The behavior of the reinforced specimens be able to induce from brittle to ductile. Experiment on loading to destroy performed the pattern of cracks, destruction aspect before and after reinforcement.

The Effect of Anchorage with Shear Reinforcement in Flat Plate System (플랫 플레이트 구조에서 전단보강체의 정착성능에 따른 전단보강효과)

  • Choi, Chang-Sik;Bae, Baek-Il;Choi, Yun-Cheul;Choi, Hyun-Ki
    • Journal of the Korea Concrete Institute
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    • v.24 no.6
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    • pp.667-675
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    • 2012
  • Flat plate are being used more in buildings requiring a high level of technical installations or in buildings needing changeable room arrangements during their life time such as office buildings. The main problem in flat plate is its weak resistance against a punching failure at its slab-column connections. Therefore, in this research, an experimental study on full-scale interior slab-column connection was performed. Three types of shear reinforcements were tested to prevent brittle punching shear failure that could lead to collapse of the structure. A series of four flat plate specimens including a specimen without shear reinforcement and three specimens with shear reinforcements were tested. The slabs were tested up to failure using monotonic vertical shear loading. The presences of the shear reinforcements substantially increased punching shear capacity and ductility of the interior slabcolumn connections. The test results showed that a slab that did not have enough bond length failed before shear reinforcement yielded due to anchorage slip. Also, FEM analyses were performed to study an effect of slab thickness and concrete compressive strength on the flat plate slab. The analytical study results were used to propose a method to calculate performance capacity of shear reinforcement in slab-column connection.