基于演化程序的混凝土徐变参数识别

  根据演化程序的思想，提供了辨识混凝土徐变模型参数的一种新方法，即将徐变计算公式中的参数识别问题转化成一个优化问题用演化程序求解。利用演化程序特点，染色体采用实数表达方式，从多个初始点开始并行寻优，遗传过程包含了非均匀变异、算术杂交和简单杂交算子，避免算法过早收敛于局域最优，使优化的效率得到提高。据此编制程序对实际工程混凝土徐变试验数据进行参数辨识，结果表明该方法所得参数与试验值吻合较好，其精度高于用传统优化方法所得的结果，且收敛速度快、编程简单、易于实现，适合处理类似混凝土徐变等复杂问题的试验数据拟合，特别是多参数的辨识。

Identification of Concrete Creep Parameters Based on Evolution Programs

A new approach based on evolution programs for parameters identification of concrete creep model is proposed. It can transform the problem of parameters identification into solution of optimization problem using evolution programs. By the evolution programs the method can search the best solution from many initial points simultaneously and obtain the total optimum solution of concrete creep model parameters with real chromosome, nonhomogeneous variation, simple crossover and arithmetical crossover operators. The results of numerical analysis are in good agreement with experimental data, and show the method has higher accuracy than existing methods and saves much time.