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단기 크리프 시험 결과를 이용한 콘크리트의 크리프 예측시의 수정

송영철;송하원;변근주

  • 발행 : 2000.08.01

초록

Creep of concrete is the most dominating factor affecting time-dependent deformations of concrete structures. Especially, creep deformation for design and construction in prestressed concrete structures should be predicted accurately because of its close relation with the loss in prestree of prestressed concrete structures. Existing creep-prediction models for special applications contain several impractical factors such as the lack ok accuracy, the requirement of long-term test and the lack of versatility for change in material properties, ets., which should be improved. In order to improve those drawbacks, a methodology to modify the creep-prediction equation specified in current Korean concrete structures design standard (KCI-99), which underestimates creep of concrete and does not consider change of condition in mixture design, is proposed. In this study, short-term creep tests were carried out for early-age concrete within 28 days after loading and their test results on influencing factors in the equation are analysed. Then, the prediction equation was modified by using the early-age creep test results. The modified prediction equation was verified by comparing their results with results obtained from long-term creep test.

키워드

creep of concrete;early-age concrete;modification of creep-prediction equation;short-term creep test

참고문헌

  1. コソクリ-ト標準示方書(平成8年制定) 日本土木學會(編)
  2. ACI Materials Journal v.93 no.2 pp.169-177 Concrete Creep and Shrinkage Prediction from Short-Term Tests Rasko P. Ojdrovic;Mehdi S.Zarghamee
  3. Model Code 1990, Comite Euro-International du Beton CEP/FIP
  4. 한국콘크리트 학회지 v.9 no.4 pp.155-164 원자로 격납구조 콘크리트의 크리프 특성에 관한 연구 송하원;정원섭;변근주;송영철
  5. ACI-SP-76 Prediction of Creep, Shrinkage, and Temperature Effects in Concrete Structure ACI Committe 209
  6. 한국콘크리트 학회지 v.9 no.6 pp.147-156 실용 고강도 콘크리트의 크리프에 관한 실험적 연구 김생빈;김성욱
  7. 콘크리트구조설계기준 한국콘크리트 학회
  8. Annual Book of ASTM Sandards v.04 no.02 Standard Test Method for Creep of Concrete in Compression ASTM Committee C-9
  9. Materials and Structures v.25 pp.21-28 Improved Prediction Model for Time Dependent Deformation of Concrete : Part 3-Creep at Drying Bazant, Z. P.;Kim, Joong-Koo;Panula, L.
  10. Creep and Shrinkage in Concrete Structures Bazant, Z. P.;Wittmann, F. H.
  11. 4th RILEM International Symposium Creep and Shrinkage of Concrete:Mathematical Modeling Bazant, Z. P.