Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Estimation of Concrete Strains and Prestress Losses in Pretensioned Members
The report describes a long-term study of concrete strains in pretensioned concrete structural members. Test data over a period of three years have been included in this study. The concrete strains are separated into three components: elastic shortening, shrinkage, and creep, and a functional expression is developed for each. Combining these components, a general stress-strain-time relationship of concrete is derived which allows the estimation of the concrete strain when the other two variables are given. The concrete stress-strain-time relationship is further combined with a similar relationship for the prestressing strands, and a general analytical procedure for the prediction of prestress loss is developed. Application of this general procedure to uniformly (centrally) prestressed concrete members is demonstrated, and results compared with the experimentally obtained values. Pending further verifications, this same procedure, with minor modifications, is expected to be also applicable to members prestressed non-uniformly (eccentricity) and/or subjected to external loading. (Author)
Estimation of Concrete Strains and Prestress Losses in Pretensioned Members
The report describes a long-term study of concrete strains in pretensioned concrete structural members. Test data over a period of three years have been included in this study. The concrete strains are separated into three components: elastic shortening, shrinkage, and creep, and a functional expression is developed for each. Combining these components, a general stress-strain-time relationship of concrete is derived which allows the estimation of the concrete strain when the other two variables are given. The concrete stress-strain-time relationship is further combined with a similar relationship for the prestressing strands, and a general analytical procedure for the prediction of prestress loss is developed. Application of this general procedure to uniformly (centrally) prestressed concrete members is demonstrated, and results compared with the experimentally obtained values. Pending further verifications, this same procedure, with minor modifications, is expected to be also applicable to members prestressed non-uniformly (eccentricity) and/or subjected to external loading. (Author)
Estimation of Concrete Strains and Prestress Losses in Pretensioned Members
H. T. Ying (Autor:in) / E. Schultchen (Autor:in) / T. Huang (Autor:in)
1972
56 pages
Report
Keine Angabe
Englisch
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