Analysis of Creep Effects in High-performance Concrete Bridge Based on AEMM

摘要

Analysis of creep behavior of High Performance Concrete (HPC) is significant due to the increase of the amount of HPC used in bridges. The common creep prediction models are mostly established on a large numbers of testing data of creep of normal-strength concrete whose simplified strength adjustment coefficient could not satisfy the accuracy in the analysis of HPC bridges, this makes the discussion on creep behavior of HPC used in bridges of paramount importance. Based on the revised creep prediction model on HPC, a creep strain incremental recurrence formulas for HPC was proposed according to the age adjusted effective modulus method and CEB-FIP model code 2010. Then, the stress relaxation function was deduced. With the secondary development function of the finite element software ANSYS, the subroutine USERCR.F and USERMAT.F have been developed. Finally, according to the incremental recurrence formulas, an ANSYS model of continuous rigid-frame bridge has been modeled analyzed, and some meaningful conclusions were obtained, which is helpful to provide a reference for the creep behavior analysis of HPC bridges.