Simplification Calculating Method Research For The Creep Of Axial Compression Concrete Members Confined By FRP

Now the calculating methods for the creep of Fiber-Reinforced Polymer (FRP) Wrapped Concrete Columns (FWCC) members are complicated, and need corresponding iterative procedures to calculate it, so it is not suitable for practical design. And the simple calculation formulas considered influencing factors in regulations around the world are not comprehensive and reasonable.The paper analyzes and modified the creep model of axially compressed FWCC members based on the B3 model for concrete creep, then corresponding computational procedures are established, according to the contrast analysis between the theoretical calculation result and tentative data, the model accuracy is confirmed. Then the influencing factors of FRP-confined concrete creep are analyzed, great amount of calculated data are obtained based on the calculating method for the creep of FWCC members, by adopting the theory of multivariate nonlinear regression analysis, simplification calculating formulas for creep of FWCC members are obtained, then the results of the simplification calculating formulas are compared with the theoretical calculation results. At last the examples are given to specify the use method and use effect.The creep model of axially compressed FWCC members based on the B3 model for concrete creep is reasonable and effective; the regression method is advanced, the results obtained by the simplification formulas agree well with the theoretical data. The simplification formulas have the characteristic of simple and comprehensive. And they are suitable for practical design.