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강원호,박대묵,성기태,김일봉 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2
A lot of researches of high strength concrete are focussed on the axial members and flexural members. Since there is little demand to choose high strength concrete because of shear problem, it is relatively rare to study shear behavior of high strength concrete beames. But we cannot avoid this problem as shear provisons of current codes are based on the experimental results of normal strength concrete beams. In this research we perform a test of 13 beams with variables of concrete strength, transverse reinforcements and sectional types. According to the test results, the shear provisons of current codes are still conservative for high strength concrete beams without transverse reinforcements. But beams with transverse reinforcements show decreasing conservatism according to the increased strength. Although shear cracking loads show little discrepancy either for beam without transverse reinforcements or with reinforcements, crack propagation speed is very fast for members without transverse reinforcements. This phenomena cannot be found for the members with transverse reinforcements, we can suppose that unstable crack propagation and size effects are not found even for high strength concrete members with transverse reinforcement. Further we have compared test results with modified compression field theory and nonlinear finite element analysis.
콘크리트 박스 거더 교량의 박스형 교각 절점부의 설계에 관한 연구
강원호,변형균,방지환,박대묵 東亞大學校 建設技術硏究所 1996 硏究論文集 Vol.20 No.1
Strut-and-tie models can illustrate very well the internal flow of forces in structural concrete and thereby, provide valuable assistance to the designer who is striving for an appropriate and functional conceptual design. After some introductory statements this will be demonstrated by dimensioning and detailing the support region of concrete box girders. In this paper it will be shown how a strut-and-tie model for the different arrangement of transverse diaphragm are developed and how in the model the interaction between the longitudinal and cross sections must be considered.
Design of the Support Region of Concrete Box Girder on Box Column
Kang, Won-Ho,Byun, Hyung-Kyun,Bhang, Jee-Hwan,Park, Dae-Muk 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1
Strut-and-tie models can illustrate very well the internal flow of forces in structural concrete and thereby, provide valuable assistance to the designer who is striving for an appropriate and functional conceptual design. After some introductory statements this will be demonstrated by dimensioning and detailing the support region of concrete box girders. In this paper it will be shown how a strut-and-tie model for the different arrangement of transverse diaphragm are developed and how in the model the interaction between the longitudinal and cross sections must be considered.