• 한국구조물진단유지관리공학회 논문집
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• 제5권3호
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• pp.141-152
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• 2001

This paper presents the evaluation of behavior and the prediction of tensile capacity of anchors that can cause a failure of the concrete on the basis of the design for anchorage. Tests of cast-in-place headed anchors, domestically manufactured and installed in uncracked and unreinforced concrete member are conducted to test the effected of embedment length and edge distance. The failure modes and the load-deformation responses of the anchors are discussed and then the concrete failure data are compared with capacities by the two present methods : the 45 degree cone method of ACI 349, 318 and the concrete capacity design (COD) method. Differences between the results by test and by two prediction methods are analyzed Finite Element Method (FEM).

• 한국구조물진단유지관리공학회 논문집
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• 제7권4호
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• pp.171-181
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• 2003

비균열 무근 콘크리트에 매입된 단일앵커는 연단거리와 콘크리트 강도에 따라 콘크리트 단부파괴, 콘크리트 부서짐파괴, 앵커파괴가 발생한다. 본 연구에서는 연단거리와 콘크리트 강도에 따라 콘크리트 단부파괴, 콘크리트 부서짐파괴, 앵커파괴 발생시 단일앵커의 전단내력평가를 목적으로 한다. 이를 위하여 ACI 318-02와 EOTA 기준의 근거인 CCD (Concrete Capacity Design) 방법과 기존의 앵커 설계기준인 ACI 349-90(45-Degree Cone Method)에 의한 예측값과 실험값을 서로 비교 평가하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 말뚝기초 학술발표회
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• pp.65-84
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• 2000

Europe and US which have more restrictive regulations than Korea about the noise and vibration during construction are using Auger-cast Pile to reduce the problem relating with noise and vibration. However Auger-cast Pile has problems like difficult quality control and low bearing capacity. In Europe, Displacement in-situ concrete Pile has been used to sove that problems since 1990s, and Korea has performed the test construction in 1997 and it has been used as the real structural foundation since 1998. Test and real construction results verified that the allowable capacity of the pile(diameter = 410mm) is between 70 and 100ton. Though De Beer & Van Imps design method utilizing CPT result is used to calculate the bearing capacity of the Displacement in-situ Pile, Korea is dependant upon the SPT as the sounding test, so design method utilizing SPT result is necessary to promote the application of the pile. To find out reasonable design method using SPT result, rearing capacity of the pile constructed in sand and clay in Korea was calculated using Meyerhof, SPT-CPT translation method, Nordlund, Douglas and DM-7 method, and the calculation results were compared to the load test result. Analysis result shows that SPT-CPT translation method is more reliable than others and economical design can be possible because it considers efficiently the friction capacity of Displacement in-situ Pile.

• Steel and Composite Structures
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• 제24권6호
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• pp.679-688
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• 2017

A GFRP-concrete composite bridge deck is presented in this paper. This composite deck is composed of concrete and a GFRP plate and is connected by GFRP perfobond (PBL) shear connectors with penetrating GFRP rebar. There are many outstanding advantages in mechanical behavior, corrosion resistance and durability of this composite deck over conventional reinforced concrete decks. To analyze the shear and flexural performance of this GFRP-concrete composite deck, a static loading experiment was carried out on seven specimens. The failure modes, strain development and ultimate bearing capacity were thoroughly examined. Based on elastic theory and strain-based theory, calculation methods for shear and flexural capacity were put forward and revised. The comparison of tested and theoretical capacity results showed that the proposed methods could effectively predict both the flexural and shear capacity of this composite deck. The ACI 440 methods were relatively conservative in predicting flexural capacity and excessively conservative in predicting shear capacity of this composite deck. The analysis of mechanical behavior and the design method can be used for the design of this composite deck and provides a significant foundation for further research.

• 한국강구조학회 논문집
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• 제23권4호
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• pp.493-501
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• 2011

콘크리트용 앵커볼트의 설계에 $45^{\circ}$ 콘파괴 이론이 그동안 적용되어 왔으나, 2,000년 이후부터 CCD(Concrete Capacity Design) 방법이 새로운 설계법으로 도입되었다. 그러나, 본 방법은 중소형 앵커볼트에 대한 실험 결과에 근거한 관계로 앵커볼트의 직경이 50mm 이하이고 매입깊이가 635mm 이하인 경우에만 허용되고 있다. 따라서 M50 이상의 중대형 앵커볼트에 대한 합리적인 인장파괴강도식의 도출이 필요한 실정이다. 본 연구에서는 매입깊이 400~450mm의 M56 선설치 단일 앵커볼트의 콘크리트 인장파괴강도 평가를 위해 5개의 시험체에 대해 실험을 수행하였다. 그리고, 본 실험 결과와 최근의 타 실험 결과를 종합하여 매입깊이가 280~1,200mm인 중대형급 앵커볼트에 대해 현 설계기준의 인장파괴강도식의 적용성 여부를 평가하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.151-156
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• 2003

On the basis of the philosophy that "the compressive axial load capacity after spalling of shell concrete should be maintained as that before spalling" by applying the confinement model of high strength concrete proposed in the previous proceeding paper and equivalent lateral confining pressure considering configurations of transverse reinforcement, the amounts of transverse reinforcement from the compressive capacity design method about high strength reinforced concrete tied columns can be calculated through the formula proposed in this paper. The proposed design equation of transverse steel amounts for high strength reinforced concrete tied columns was quite agreeable with the test results of HSC tied columns conducted by other researchers as well as author.as author.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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• pp.169-174
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• 2001

This study concerns crack effect on concrete anchor system and prediction of tensile capacity, as governed by concrete cone failure, of single anchors located at center of concrete specimen. To Investigate crack effect three different types of crack such as crack width of 0.2mm and 0.5nm, crack depth of loom and 20cm, and crack location of center and biased point were simulated. The static tensile load was subjected to 7/8 in. CIP anchor embedded in concrete of strength 280kg/$cm^{2}$. Tested pullout capacity was compared to prediction value by each current design method (such as ACI 349-97, ACI 349 revision and CEB-FIP which is based on CC Method), In these comparison CC Method and ACI revision showed almost same value in uncracked concrete specimen, however in cracked concrete CC Method showed conservativeness. Therefore the design by ACI 349 revision is recommended for the safe and economic design.

• 한국강구조학회 논문집
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• 제24권2호
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• pp.207-215
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• 2012

전단하중을 받는 앵커볼트의 설계에 $45^{\circ}$ 콘파괴 이론이 그동안 적용되어 왔으나, 2,000년 이후부터 CCD(Concrete Capacity Design) 방법이 새로운 설계법으로 도입되었다. 그러나, 본 방법은 주로 소형 앵커볼트에 대한 실험 결과에 근거한 관계로 앵커볼트의 직경이 50mm 이하인 경우에 한해 적용이 허용되고 있다. 따라서 큰 연단거리를 갖는 중대형 앵커볼트에 대한 합리적인 콘크리트 파열파괴강도식의 도출이 필요한 실정이다. 본 연구에서는 M56 선설치 단일 앵커볼트로 연단거리 350mm에 대해 콘크리트 파열파괴강도 평가를 위해 4개의 시험체에 대해 실험을 수행하였다. 그리고, 본 실험 결과와 타 연구의 실험 결과를 종합하여 연단거리 750mm까지의 큰 연단거리에 대해 새로운 전단파괴강도식을 제안하였다.

• 한국강구조학회 논문집
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• 제26권1호
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• pp.11-20
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• 2014

2001년 이후 앵커의 설계는 Concrete Capacity Design(CCD) 방법이 적용되고 있는데, 국내 기준에서는 지진하중에 대한 콘크리트의 파열파괴강도를 정적 파괴강도의 75%로 제한하고 있다. 본 연구에서는 무근콘크리트에 매입된 선설치앵커의 동적 전단하중에 대한 콘크리트 파열파괴강도 평가하기 위한 실험을 수행하였다. 이를 위해 직경 20 mm의 앵커에 대해 정적 하중과 동적 편진하중에 대한 실험을 각각 3개의 시험체에 대해 수행하였으며, 앵커의 연단거리는 120 mm를 적용하였다. 동적 실험은 15 cycle의 편진하중을 1 Hz의 속도로 재하하였으며 반복하중단계의 크기를 키워가면서 최종 파괴 시까지 가력하였다. 실험으로부터 동적 전단하중에 의한 콘크리트 파열파괴강도는 정적하중에 의한 것과 거의 같은 파괴강도를 보였다.

• Computers and Concrete
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• 제24권4호
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• pp.283-293
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• 2019

The limited availability of raw materials and increasing service demands for pavements pose a unique challenge in terms of pavement design and concrete material selection. The self-compacting rubberized concrete (SCRC) can be used in pavement design. The SCRC pavement slab has advantages of excellent toughness, anti-fatigue and convenient construction. On the premise of satisfying the strength, the SCRC can increase the ductility of pavement slab. The aim of this investigation is proposing a new method to predict the crack growth and flexural capacity of large-scale SCRC slabs. The mechanical properties of SCRC are obtained from experiments on small-scale SCRC specimens. With the increasing of the specimen depth, the bearing capacity of SCRC beams decreases at the same initial crack-depth ratio. By constructing extended finite element method (XFEM) models, crack growth and flexural capacity of large-scale SCRC slabs with different fracture types and force conditions can be predicted. Considering the diversity of fracture types and force conditions of the concrete pavement slab, the corresponding test was used to verify the reliability of the prediction model. The crack growth and flexural capacity of SCRC slabs can be obtained from XFEM models. It is convenient to conduct the experiment and can save cost.