Influence of Height and Section Shape of Rectangular Confined Concrete on its StressStrain Relationship
Project/Area Number  13650629 
Research Category 
GrantinAid for Scientific Research (C)

Allocation Type  Singleyear Grants 
Section  一般 
Research Field 
Building structures/materials

Research Institution  Osaka University 
Principal Investigator 
NAKATSUKA Tadashi Osaka University, Graduate School of Engineering Department of Architectural Engineering, Associate Professor, 大学院・工学研究科, 助教授 (60107133)

CoInvestigator(Kenkyūbuntansha) 
ARAKI Hideo Hiroshima University, Graduate School of Engineering, Department of Social and Environmental Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40159497)

Project Period (FY) 
2001 – 2002

Project Status 
Completed(Fiscal Year 2002)

Budget Amount *help 
¥3,700,000 (Direct Cost : ¥3,700,000)
Fiscal Year 2002 : ¥1,600,000 (Direct Cost : ¥1,600,000)
Fiscal Year 2001 : ¥2,100,000 (Direct Cost : ¥2,100,000)

Keywords  confined concrete / rectangular / stressstrain relation / ratio of height to short side length / ratio to long side length to short one / performance design / shear force / resisting mechanism / 圧縮強度時ひずみ / 角型 
Research Abstract 
For the latest performance design of concrete structures , information on loaddeformation characteristics and damage assessment of structural members are required essentially. This situation leads to necessity of more researches, on stressstrain relations of concrete, especially confined concrete which relates closely structural performance of the members. Investigations on strength and deformation properties of the concrete with rectangular sections under uniaxial compression load, and subjected to shear force and axial load were carried out. Following main conclusions are obtained. 1) In the case of plain concrete under uniaxial compression, though the side length ratio of rectangular section has little influence on the stressstrain relationship, the ratio of height to the short side length of the section has a pronounced effect on the characteristics, that is, compression strength and strain at the strength increase, and gradients of falling branch of stressstrain relations beco
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me more gently with decrease in the ratio. In contrast, in the case of confined concrete, similar remarkable effects of the ratio of height to the short side length are observed. The side length ratio influences strength and deformation properties due to decrement of confining stress of lateral reinforcement relative to long side length of the rectangular section. 2) Equations to estimate stressstrain relations of concrete with different ratios of long side length, to short one, and ratios of height to short side length of rectangular sections are derived. Moreover, it is shown that the equations predict strength and deformation characteristics with practical accuracy. 3) Uniaxial stressstrain characteristics of confined concrete subjected to constant shear force and axial load show smaller tangent modulus, smaller compressive. strength and smaller strain at the strength, in the case of higher shear force level. Equations to estimate strength and strain at the strength are introduced using test data. Less

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Research Products
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