• Title/Summary/Keyword: ultimate shear strength

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Influence of Shear and Bond on Deformation Capacity of RC Beams (보의 변형능력에 미치는 전단과 부착응력의 영향)

  • Hong, Sung-Gul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05a
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    • pp.366-369
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    • 2006
  • Deformability of RC members in shear is controlled by governing failure modes and material strength. Shear strength of members in D-regions has been explained by a direct load path (direct strut or arch action) and indirect load path (fan action or truss action). Indirect load path including truss action and fan action rely on bond along tension ties. Generally, superposition of two actions results in total shear strength when shear failure modes control. The ultimate deformation depends on controlling failure modes and thereby, their force transfer patterns. Proposed models are capable of explaining of limited deformability of RC members in D-regions.

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Deformability models for flexural-shear failure of limited ductility (휨-전단 파괴의 한정 연성도 모형)

  • Hong, Sung-Gul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.261-264
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    • 2006
  • Deformability of RC members in shear after flexural yielding is limited and controlled by governing failure modes and material strength. Shear strength of members in D-regions has been explained by a direct load path (direct strut or arch action) and indirect load path (fan action or truss action). Indirect load path including truss action and fan action rely on bond along tension ties. Generally, superposition of two actions results in total shear strength when shear failure modes control. The ultimate deformation depends on controlling failure modes and thereby, their force transfer patterns. Proposed models are capable of explaining of limited deformability of RC members in D-regions.

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A Study on the Shear Properties of Steel Fiber Reinforced Concrete Deep Beams (강섬유보강(鋼纖維補强)콘크리트 Deep Beam의 전단특성(剪斷特性)에 관한 연구(硏究))

  • Moon, Je Kil;Hong, Ik Pyo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.13 no.1
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    • pp.75-87
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    • 1993
  • Four series of fiber reinforced concrete deep beams without shear reinforcement were tested to determine their cracking shear strengths and ultimate shear capacities. Results of tests on 20 reinforced concrete deep beams (including 16 containing steel fibers) are reported. Three parameters were varied in the study, namely, the concrete compressive strength, volume fraction of fibers, and the shear span to depth ratio. The effects of fiber incorporation on failure modes, deflections. strains, cracking shear strength, and ultimate shear strength have been examined. Resistance to shear stresses have been found to be improved by the inclusion of fibers. Based on these investigations, a method of computing the shear stress of steel fiber reinforced concrete deep beam is suggested. The comparisons between computed values and experimentally observed values are shown to validate the proposed theoretical treatment.

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Experimental Study on the Fatigue Enhancement of RC Beams with Glassfibers (유리섬유보강 RC보의 휨 및 전단 피로성능개선의 실험 연구)

  • 조창백;양정비;정영수;김기봉
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.507-512
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    • 1999
  • In recent years, glassfibers have been used for strengthening in RC structure because of low material cost and easy repairing work. The purpose of this study is to experimentally and analytically investigate the effect of glassfibers for enhancing the capacity of RC flexural beams and shear beams. The experimental result shows that yield and ultimate strength of RC flexural beam with glassfibers are increased by approxiamate 13% and 26%, comparing with those for without glassfibers, and also ultimate strength of RC shear beam with glassfibers are increased by 34%, comparing with those for without glassfibers.

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Shear Behavior of Polymer Cement High Strength Concrete Beams Mixed with Steel Fiber (강섬유 혼입 폴리머 시멘트 고강도 콘크리트 보의 전단거동)

  • 곽계환;박종건;곽경헌
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.44 no.1
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    • pp.93-102
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    • 2002
  • Steel fiber and polymer are used widely for reinforcement material of RC structures because of its excellences of the durability, serviceability as well as mechanical properties. The purpose of this study is to investigate the shear behavior of polymer cement high strength concrete beams mixed with steel fiber. The compressive strength of concrete was based on the 100$\times$200 mm cylinder specimens. The compressive strength of concrete are 320$kgf/cm^2$, 436 $kgf/cm^2$ and 520 $kgf/cm^2$ in the 28 days. The static test was carried out to measure the ultimate load, the initial load of flexural and diagonal cracking, crack patterns and fracture modes. Also, load-strain and load-deflection examined. During the test cracks were sketched against the load values according to the growth of crack. result are as follows; (1) The failure modes of the specimens are increased in rigidity and durability with mixing steel fiber and polymer. (2) The load of initial crack was similar a theory of shear-crack strength. (3) The deflection and strain at failure load of Polymer-steel fiber high strength concrete beams were increased, improving the brittleness of the high strength concrete.

An Experimental Study on Block Shear Strength of Carbon Steel Fillet Welded Connection with Base Metal Fracture (탄소강 용접접합부의 모재블록전단내력에 관한 실험적 연구)

  • Lee, Hwa-Young;Hwang, Bo-kyung;Lee, Hoo-Chang;Kim, Tea-Soo
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.1
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    • pp.11-18
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    • 2018
  • An experimental study on the ultimate behaviors of the mild carbon steel (SPHC) fillet-welded connection is presented in this paper. Seven specimens were fabricated by the shielded metal arc welding (SMAW). All specimens failed by typical block shear fracture in the base metal of welded connections not weld metal. Block shear fracture observed in the base metal of welded connection is a combination of single tensile fracture transverse to the loading direction and two shear fractures longitudinal to the loading direction. Test strengths were compared with strength predictions by the current design equations and suggested equations by previous researchers. It is known that current design specifications (AISC2010 and KBC2016) and Oosterhof & Driver's equation underestimated overly the ultimate strength of the welded connection by on average 44%, 31%, respectively and prediction by Topkaya's equation was the closest to the test results. Consequently, modified equation is required to be proposed considering the stress triaxiality effect and material property difference on the block shear strength for base metal fracture in welded connections fabricated with mild carbon steel.

Flexural Strength Evaluation of RC Members Laminated by Carbon Fiber Sheet

  • Park, Hae-Geun
    • KCI Concrete Journal
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    • v.14 no.1
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    • pp.1-7
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    • 2002
  • This paper reports the experimental and analytical investigations for evaluating the flexural strength of a RC slab strengthened with carbon fiber sheet (CFS). The evaluation of the ultimate flexural strength of a slab is tried under the assumption that the failure occurs when the shear stress mobilized at the interface between the concrete bottom and the glued CFS reaches its bond strength. The shear stress is evaluated theoretically and the bond strength is obtained by a laboratory test. The ultimate flexural strength is obtained by flexural static test of the slab specimen, which corresponds to the part of a real slab. From the results, the new approach based on the bond strength between concrete and CFS looks feasible to evaluate the flexural strength of the CFS and RC composite slab.

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Static Behavior of Large Stud Shear Connectors (대직경 스터드 전단연결재의 정적거동)

  • Lee, Pil Goo;Shim, Chang Su;Yoon, Tae Yang
    • Journal of Korean Society of Steel Construction
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    • v.15 no.6 s.67
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    • pp.611-620
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    • 2003
  • Shear studs with a diameter of 19mm or 22mm are typically used in steel-concrete composite bridge. For the simplification of details in steel bridges, the convenience of removing concrete slab, and the efficient distribution of shear pockets for precast decks, large studs can be an excellent alternative. Through push-out tests on large stud shear connectors that transcend the limitation of current design codes, static behavior was investigated and comparisons with design equations performed. The shear stiffness of the connectors in elastic range and trilinear load-slip curves were proposed after shear tests on 25mm, 27mm, and 30mm studs. The ultimate slip capacity and ultimate strength of large studs were also evaluated, with the test results revealing conservative values for the design shear strength in Eurocode-4. For 30mm stud shear connectors, the welding quality and bearing capacity of concrete slab should be improved.

The Development of Ultimate Compressive Strength for Ship Curved Plates (선체곡판의 압축최종강도 설계식의 개발)

  • 박영일;권용우;백점기;이제명;고재용
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2004.10a
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    • pp.101-109
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    • 2004
  • Ship structures is thin-walled structures and she has lots of curved platings. In these days, lots different kinds of closed-formulas are development for ultimate strength of flat plate but for curved panels, there are not enough study or papers for this field. In this study, the ultimate strength characteristics for ship curved plates are studied. The ship plating is generally subjected to combined in-plane and lateral pressure loads. In-plane loads included biaxial compression/tension and edge shear. This is first report about the developing of ultimate compressive strength for ship curved plating. A closed-form formula for predicting the ultimate compressive strength of curved plates are empirically derived by curve fitting based on the computed results. The results and insights developed in the present study will be useful for damage tolerant design of curved plated structures.

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A Study on the Shear Strength Properties of Reinforced Concrete Beams according to Shear Span-Depth Ratio (전단지간비에 따른 철근콘크리트 보의 전단강도특성에 관한 연구)

  • Park, Jong-Gun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.4 no.1
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    • pp.93-100
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    • 2000
  • The purpose of this study is to investigate the shear behavior of reinforced concrete beams according to small shear span-depth ratio between a/d=1.5, 2.8, 3.6. In general, shear strength of reinforced concrete beams is dependent on the compressive strength of concrete the longitudinal steel ratio, the shear span-depth ratio and shear reinforcement. The static test was carried out to measure the ultimate load, the initial load of flexural and diagonal cracking, crack patterns, fracture modes. The load versus strain and load versus deflection relations were obtained from the static test. The test results on shear strength were compared with results obtained by the formulas of ACI code 318-95. The shear strength of reinforced concrete beams exceeded those predicted following present ACI code 318-95(11-6).

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