关键词: 桥梁工程, 徐变模型, 高性能混凝土, 有限元分析, 长期变形

Abstract: Aiming at the problem of inaccuracy of simulation results caused by direct selection of norm values in finite element software with consideration of creep, a method was proposed that concrete creep test under compression should be carried out first, and then the tested data should be applied to finite element software for simulation analysis. Based on the empirical creep prediction formulas established by J.J.Brooks and Neville, the long-term creep prediction model for C55 concrete was obtained by modifying the short-term test data. The research results show that: there are some differences between the creep development law of the existing creep prediction models and that measured by the experiment, which will have a significant impact on the simulation results of bridge alignment, and the impact will increase with time; when establishing a long-term creep prediction model, the prediction accuracy can be effectively improved by increasing the short-term test time appropriately.

Key words: bridge engineering, creep model, high performance concrete, finite element analysis, long-term deformation