• 대한토목학회논문집
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• 제28권2A호
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• pp.269-279
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• 2008

본 논문에서는 전편논문에서 제안한 부정정 스트럿-타이 모델 및 하중분배율 결정식을 ACI 318-05 스트럿-타이 모델 설계기준에 적용하여 파괴실험이 수행된 229개 단순지지 철근콘크리트 깊은 보의 극한강도를 평가하였다. 또한 229개 깊은 보의 극한강도를 실험식, 실험 전단강도모델에 기초한 설계기준, 이론 전단강도모델에 기초한 설계기준, 그리고 현 스트럿-타이 모델 설계기준 등으로 평가하고, 그 결과를 본 연구의 방법에 의한 결과와 비교분석하여 본 연구에서 제안한 방법의 적합성을 검증하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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• pp.189-194
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• 2001

In this study, ultimate strength of concrete deep beams with an opening is predicted by using Strut-and-Tie Model with a new effective compressive strength. First crack occurs around an opening by stress concentration due to geometric discontinuity. This results in decreasing ultimate strength of deep beams with an opening compared with general deep beams. With fundamental notion that ultimate strength of deep beam with an opening decreases as a result of reduction in effective compressive strength of a concrete strut, an equivalent effective compressive strength formula is proposed in order to reflect ultimate strength reduction due to an opening located in a concrete strut. An equivalent effective compressive strength formula which can reflect opening size and position is added to a testified algorithm of predicting ultimate strength of concrete deep beams. Therefore, ultimate strength of concrete deep beam with an opening is predicted by using a simple and rational STM algorithm including an equivalent effective compressive strength formula, not by finite element analysis or a former complex Strut-and-Tie Model

• 한국도로학회논문집
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• 제8권1호
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• pp.33-43
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• 2006

신설포장에 시공되는 타이바의 경우에는 콘크리트 타설시 타이바가 슬래브 안에 묻히기 때문에 타이바의 정착강도가 문제되지 않으나, 확장시에는 기존 포장을 천공한 후 충전재를 주입하여 설치하기 때문에 타이바가 충분한 정착강도를 확보 할 수 있도록 설계해야 한다. 만일 삽입된 타이바가 충분한 정착강도를 확보하지 못한다면, 슬래브 간에 하중 전달에 문제가 생길 뿐만 아니라 줄눈 간격이 과도하게 벌어져서 사용성 및 내구성에도 나쁜 영향을 주게 된다. 본 연구에서는 현재 현장에서 설치하는 시공방법에 의해 타이바의 정착강도를 확인하고 이에 대한 대안을 제시 하고자 한다. 실험결과 현장 시공방법으로 설치된 타이바의 정착강도는 소요 정착강도의 42.7%에 불과하였다. 첫 번째 대안으로서 주입기를 이용하여 충전재를 주입하고 마개를 사용하여 충전재가 흘러 나오지 못하게 막는 방법의 경우에는 소요 정착강도를 충분히 만족 하였으나, 현장에서의 품질관리가 쉽지 않을 것으로 판단된다. 두 번째 대안으로 제시된 SL 앵커볼트를 이용하여 타이바를 설치하는 방법은 충분한 정착강도를 확보 할 수 있으며 품질관리 및 시공성이 용이 한 것으로 판단된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1995년도 봄 학술발표회 논문집
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• pp.251-256
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• 1995

This paper presents an evaluation of the strength and behavior of a tested simply supported rectangular reinforced eoncrete beam and a design example of a shear wall using two-dimensional strut-tie model with finite element nonlinear analysis. Strut-tie models reflecting the actual support and loading conditions are developed for the beam and shear wall. The strut-tie model not only provides simple solutions for large number of design situations dealing with the entire range of concrete structures which appear to be rather complicated but also predicts the behavior and strength of concrete members.

• 한국지진공학회논문집
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• 제21권1호
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• pp.21-29
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• 2017

Purpose of this study is to investigate structural behavior of the rectangular hollow column with various transverse reinforcement details. Experimental variables are diameter, arrangement details and lateral spacing of cross tie. A total of 66 column specimens have been prepared and tested under axial compressive load. Test results showed that behaviors of column specimens were different depending on the cross tie details. Specimens with cross tie wrapping longitudinal steel and transverse steel have greater strength and ductility than specimens with cross tie wrapping the longitudinal steel.

• Structural Engineering and Mechanics
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• 제44권2호
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• pp.163-178
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• 2012

A strut-and-tie model is introduced in this paper to predict the ultimate shear strength of non-seismically detailed columns. The validity and applicability of the proposed strut-and-tie model are evaluated by comparison with available experimental data. The model was developed based on visible crack patterns observed on the test specimens. The concrete contribution is integrated into the strut-and-tie model through a concept of equivalent transverse reinforcement. To further validate the model a full-scale non-seismically detailed reinforced concrete column was tested to investigate its seismic behavior. The specimen was tested under the combination of a constant axial load, $0.30f_c{^{\prime}}A_g$ and quasi-static cyclic loadings simulating earthquake actions. Quasi-static cyclic loadings simulating earthquake actions were applied to the specimen until it could not sustain the applied axial load. The analytical results reveal that the strut-and-tie method is capable of modeling to a satisfactory accuracy the ultimate shear strength of non-seismically detailed columns subjected to reserved cyclic loadings.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.393-396
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• 2008

본 논문에서는 띠철근 간격에 따른 고강도 콘크리트 기둥의 내화 성능에 대한 실험결과를 제시하고 있다. 단면 크기 305${\times}$305mm이 고강도 콘크리트 기둥을 3개 제작하였으며, 띠철근 간격은 150, 210, 300mm 이었다. 시험시의 압축강도는 69MPa이었다. 시험 결과로서, 고강도 콘크리트 기둥의 내화 성능은 띠철근 간격에 큰 영향을 받는 것으로 나타났다. 띠철근 간격이 줄어들수록 내화 성능이 증가하는 것으로 나타났다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.540-543
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• 2004

In this study, the validity of the grid softened strut-tie model method suggested for concrete member analysis is examined through the ultimate strength evaluation of the reinforced concrete beams. The evaluated results of ultimate strength by the grid softened strut-tie model method were compared with those by the ACI 318-02 and the modified compression field theory, and European codes.

• 한국IT서비스학회지
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• 제12권2호
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• pp.119-129
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• 2013

The degree to which people share knowledge has major impacts on the effectiveness of virtual community of practice (VCoP). As an extension to the previous study which investigated the effect of individual cooperative types (cooperator, reciprocator, and free rider) on knowledge sharing, it is investigated how much increase in the degree of cooperation will enhance knowledge sharing when there are more knowledge contributors and strong ties exist across the community. Simulation method is adopted to measure the effect of the cooperative type and tie strength on knowledge sharing. The results reveal that the tie strength positively affects knowledge contribution in VCoP and strongly tied VCoP generates equivalent level of knowledge contribution as that of weakly-tied VCoP with 5% more contributors.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.91-94
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• 2005

Experimental research was conducted to investigate the behavior of RC circular columns confined by high-strength ties. Large scale columns with concrete strength 34.1 and 65.3 MPa were tested under monotonically increasing concentric compression. The test parameters included the volumetric ratio, tie arrangement, tie yield strength, and concrete compressive strength. The results indicate that high-strength concrete columns can be confined to achieve inelastic deformations usually predicted for normal-strength concrete columns. This can be done by providing increasing volumetric ratio and tie yield strength.