中文摘要：

在细菌觅食算法（bacterial foraging algorithm, BFA）基本原理的基础上，结合“和声搜索”算法，提出了一种改进的细菌觅食算法，并应用于框架结构优化．采用该优化算法分别对一单跨8层框架和双跨5层框架结构进行离散变量的质量优化设计，并与细菌觅食算法的计算结果进行了比较．计算结果表明改进的细菌觅食算法应用在结构优化中具有较好的收敛速度和精度，可应用于工程结构的优化设计．

英文摘要：

Based on the basic principles of bacterial foraging algorithm（BFA）, an improved bacte- rial foraging algorithm（IBFA） was proposed, which combined with heuristic algorithm, and was applied to optimal design of frame structures. The weight optimization design of discrete variable was carried out on a one-bay eight-floor frame structure and a two-bay five-floor frame structure using this algorithm. The calculation results were compared with those of BFA. The optimal re- sults show that the improved bacterial foraging algorithm has better convergence velocity and ac- curacy, and can be applied to optimal design of engineering structures.