Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Study on Creep and Shrinkage of High-Strength Plain Concrete and Reinforced Concrete
It is important to accurately estimate creep and shrinkage effects in long-span continuous box girder bridges. Based on the experiments on creep and shrinkage of the plain concrete used in the continuous rigid frame of Sutong Bridge, China, the applicability of ACI 209–82, JTG D62–2004, B3 and GL2000 prediction model for creep and shrinkage on the high-strength concrete is evaluated. Also, a modified model based upon JTG D62–2004 is presented. Results indicate that the accuracy of prediction of creep and shrinkage can be enhanced greatly by carrying out short-term creep and shrinkage measurements on the given concrete and modifying the prediction model parameters accordingly. Furthermore, the presence of steels can have an impact on the time-dependent deformations caused by creep and shrinkage, accordingly, the restraint influence of steels on creep and shrinkage is investigated through the reinforced specimens with different reinforcement ratio. Formulas of influence coefficients of steels on creep and shrinkage are derived, and a good agreement is observed between the calculated values of the influence coefficients of steels on creep and shrinkage and the measured data in each specimen. The reinforced specimens can be also used for calibrating the modified model.
Experimental Study on Creep and Shrinkage of High-Strength Plain Concrete and Reinforced Concrete
It is important to accurately estimate creep and shrinkage effects in long-span continuous box girder bridges. Based on the experiments on creep and shrinkage of the plain concrete used in the continuous rigid frame of Sutong Bridge, China, the applicability of ACI 209–82, JTG D62–2004, B3 and GL2000 prediction model for creep and shrinkage on the high-strength concrete is evaluated. Also, a modified model based upon JTG D62–2004 is presented. Results indicate that the accuracy of prediction of creep and shrinkage can be enhanced greatly by carrying out short-term creep and shrinkage measurements on the given concrete and modifying the prediction model parameters accordingly. Furthermore, the presence of steels can have an impact on the time-dependent deformations caused by creep and shrinkage, accordingly, the restraint influence of steels on creep and shrinkage is investigated through the reinforced specimens with different reinforcement ratio. Formulas of influence coefficients of steels on creep and shrinkage are derived, and a good agreement is observed between the calculated values of the influence coefficients of steels on creep and shrinkage and the measured data in each specimen. The reinforced specimens can be also used for calibrating the modified model.
Experimental Study on Creep and Shrinkage of High-Strength Plain Concrete and Reinforced Concrete
Pan, Zuanfeng (Autor:in) / Lü, Zhitao (Autor:in) / Fu, Chung C. (Autor:in)
Advances in Structural Engineering ; 14 ; 235-247
01.04.2011
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Experimental Study on Creep and Shrinkage of High-Strength Plain Concrete and Reinforced Concrete
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