PS 콘크리트 구조물 해석을 위한 크리프 특성에 관한 연구 = A Study on the Creep Characterization for Analyzing Prestressed Concrete Structures

다국어 초록 (Multilingual Abstract)

During the initial design phases for prestressed concrete structures, the necessary information concerning the physical properties of the hardened concrete such as creep, drying shrinkage, modulus of elasticity, Poisson's ratio and coefficient of thermal expansion are obtained from design assumptions, accepted design criteria or formula calculations. Although these values are based upon sound engineering logic or standard recommended practice of design, they may not totally reflect the actual long-term behaviour of the concrete. As a result, these assumptions may be of limited use in predicting the actual long-term behavior of the concrete under conditions of actual design loads during periods of change in temperature, load or pressure.
For these reasons, the creep test has generally conducted under simulated laboratory conditions of anticipated design loading and temperature environments in order to provide a realistic basis for comparing the original design assumptions with the actual measured long-term physical properties of the concrete. Extensive research has been carried out a comprehensive laboratory investigation of the effects of age, curing history, temperature of environment and constant creep loading upon the physical properties of given concrete mix to predict the long-term creep coefficient and shrinkage.
This paper presents specific creep values with various types of experimental data and also shows comparisons for specific creep between from test results and from creep prediction equations to evaluate the applicability of creep prediction equations of Korean Concrete Standard Specification, ACI-209, CEB/FIP-90 and Japanese Concrete Standard Specification.

목차 (Table of Contents)

• Ⅰ.서론
• Ⅱ.콘크리트 크리프 특성 시험
• 1.시험방법
• 2.공시체 제작 및 계기설치
• 3.저장환경조건
• 4.시험재료 및 배합설계
• 5.시험결과 및 고찰
• Ⅲ.크리프 예측식에 의한 크리프해석
• 1.ACI-209 크리프 예측식
• 2.KSCE-96 예측식
• 3.JSCE-96 예측식
• 4.CEB/FIP-90 크리프 예측식
• Ⅳ.시험과 예측식에 의한 크리프 변형 비교
• Ⅴ.결론