2방향 슬래브의 펀칭전단성능 향상을 위한 고성능 철근의 적용
Application of High-Performance Steels to Enhance the Punching Shear Capacity of Two-Way Slabs
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Two-way slabs reinforced with high-performance steels, which have several practical advantages of a reduction of congestion in heavily reinforced members, savings in the cost of labor and repair, the higher corrosion resistance, and a reduction of construction time, were constructed and tested. The influences of the flexural reinforcement ratio, concentrating the reinforcement in the immediate column region, and using steel fiber-reinforced concrete (SFRC) in the slab on the punching shear resistance and post-cracking stiffness were investigated, and compared with the punching shear test results of the slabs reinforced with conventional steels and GFRP bars. In addition, the strain distribution of flexural reinforcements and crack control were investigated, and the effective width calculating method for the average flexural reinforcement ratio was estimated. The use of high-performance steel reinforcement increased the punching shear strength of slabs, and decreased the amount of flexural reinforcements. The concentrating the top mat of flexural reinforcement increased the post-cracking stiffness, and showed better strain distribution and crack control. In addition, the use of SFRC showed beneficial effects on the punching shear strength and crack control. It was suggest that the effective width should be changed to larger than 2 times the slab thickness from the column faces.
Abstract
Two-way slabs reinforced with high-performance steels, which have several practical advantages of a reduction of congestion in heavily reinforced members, savings in the cost of labor and repair, the higher corrosion resistance, and a reduction of construction time, were constructed and tested. The influences of the flexural reinforcement ratio, concentrating the reinforcement in the immediate column region, and using steel fiber-reinforced concrete (SFRC) in the slab on the punching shear resistance and post-cracking stiffness were investigated, and compared with the punching shear test results of the slabs reinforced with conventional steels and GFRP bars. In addition, the strain distribution of flexural reinforcements and crack control were investigated, and the effective width calculating method for the average flexural reinforcement ratio was estimated. The use of high-performance steel reinforcement increased the punching shear strength of slabs, and decreased the amount of flexural reinforcements. The concentrating the top mat of flexural reinforcement increased the post-cracking stiffness, and showed better strain distribution and crack control. In addition, the use of SFRC showed beneficial effects on the punching shear strength and crack control. It was suggest that the effective width should be changed to larger than 2 times the slab thickness from the column faces.
참고문헌 (23)
- 이주하, "2방향 슬래브의 성능향상을 위한 집중 배근된 FRP 바의 적용", 콘크리트학회 논문집, 19(6), pp.727~734 (2007), 한국콘크리트학회
- 한국콘크리트학회, "콘크리트 구조설계기준 해설", 한국콘크리트학회, 523~ (2007)
- Bond and Development of Straight Reinforcing Bars in Tension, "ACI Committee 408", American Concrete Institute, Farmington Hills, 49~, pp.ACI 408R-03 (2003)
- Alexander, S. B. D, "Test of Column-Flat Plate Connections", ACI Structural Journal, 89(5), pp.495~577 (1992)
- Building Code Requirements for Structural Concrete and Commentary, "American Concrete Institute(ACI)", Farmington Hill, 473~, pp.ACI 318-08 and ACI 318M-08 (2008)
- Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars, "American Concrete Institute(ACI)", Farmington Hill,, 44~, pp.ACI 440.1R-06 (2006)
- Standard Specification for Deformed and Plain, Low-Carbon, Chromium, Steel Bars for Concrete Reinforcement, "ASTM International", West Conshohocken, 47~, pp.ASTM A1035-07 (2007)
- Standard Test Methods and Definitions for Mechanical Testing of Steel Products, "ASTM International", West Conshohocken,, 47~, pp.ASTM A370-08 (2008)
- Structural Use of Concrete, "British Standard Institution(BSI)", Standard BS 8110,, 168~ (1997)
- Design of Concrete Structures, "Canadian Standards Association(CSA)", Mississauga, 249~, pp.CSA A23.3-04 (2004)
- Effect of Flexural Reinforcement on Punching Shear Resistance”, "Dilger, W", Farmington Hills, 57~73, pp.SP-232 (2005)
- European Standard, "Eurocode 2: Design of Concrete Structures-Part 1: General Rules and Rules for Buildings, prEN 1992-1-1, Final Draft", European Committee for Standardization, 226~ (2003)
- Ghannoum, C. M, "Effect of High-Strength Concrete on the Performance of Slab-Column Specimens", 석사, pp.1998
- Hassan, T. K, "Shear Behavior of Large Concrete Beams Reinforced with High-Strength Steel", ACI Structural Journal, 105(2), pp.173~179 (2008)
- Mast, R. F, "Flexural Strength Design of Concrete Beams Reinforced with High-Strength Steel Bars", ACIStructural Journal, 105(4), pp.570~577 (2008)
- McHarg, P. J, "Benefits of Concentrated Slab Reinforcement and Steel Fibers on Performance of Slab-Column Connections", ACI Structural Journal, 97(2), pp.225~234 (2000)
- MMFX Technologies Corporation, "MMFX Steel Product Guide, MMFX Technologies Corporation of America", pp.73~ (2007), Las Vegas
- Morgan, D. R, "esting and specifying toughness for fiber reinforced concrete and shotcrete", Proc., 2nd Univ. - Industry Workshop on Fiber-Reinforced Concrete and Other Advanced Composites - Fiber-Reinforced Concrete - Modern Developments
- Regan, P. E, "Symmetric Punching of Reinforced Concrete Slabs", Magazine of Concrete Research, 38(136), pp.115~128 (1986)
- Seliem, H. M. A, "Behavior of Concrete Bridges Reinforced with High-Performance Steel Reinforcing Bars", 박사, pp.2007
- Seliem, H. M, "Bond Characteristics of ASTM A1035 Steel Reinforcing Bars", ACI Structural Journal, 106(4), pp.530~539 (2009)
- Sumpter, M. S, "Behavior of High-Performance Steel as Shear Reinforcement for Concrete Beams", ACI Structural Journal, 106(2), pp.171~177 (2009)
- Whitney, C. S, "Ultimate Shear Strength of Reinforced Concrete Flat Slabs, Footings, Beams and Frame Members without Shear Reinforcement", ACI Journal, Proceedings, 54, pp.265~298 (1957)