关键词: 高性能混凝土, 标准状态, 徐变模型, 徐变系数, 预测公式

Abstract:

In the present models of creep prediction in high-performance concrete,influencing factors are mainly obtained through regression of measured data,with limit and poor application in practical projects.According to the existing creep model,a formula for creep prediction in standard condition is presented.In association with the characteristics of high-performance concrete,a creep model with wide application fields and high prediction accuracy is established through parameterizing influence effects of creep.In the model,only one factor is changed and the others are under the control of standard state.Meanwhile,in order to improve accuracy of parameter,we analyze creep coefficient by using genetic algorithm,automatically looking for parameter.The results on the accuracy of the model show that the predicted values are in good agreement with the experimental values,and it can be applied not only to ordinary concrete, but also to high-performance concrete.Furthermore,the calculation is simple and the model can provide a reference for the design and engineering applications.

Key words: high-performance concrete, standard state, creep model, creep coefficient, predication formula