基于改进蛙跳算法的结构可靠指标计算

摘要

为了克服传统的结构可靠指标求解方法存在的模型描述和计算缺陷，引入改进混合蛙跳算法用于求解可靠指标。针对标准蛙跳算法求解组合优化问题时后期收敛速度慢、容易陷入局部最优的缺点，新算法引入蚁群算法的信息素调整策略，对蛙跳算法后期局部搜索进行改进，扩大算法后期搜索范围，使蛙跳算法跳出局部最优。最后，将改进后的算法应用到结构可靠指标的求解过程，算例验证了改进算法的有效性。%In order to overcome the shortcomings of the traditional methods of the reliability index calcu-lation in model description and calculation,the improved shuffled frog leaping algorithm was introduced. The adjust strategy of pheromone of ant colony algorithm was employed to solve the local optimum problem of the basic shuffled frog leaping algorithm.The improvement can expand the search scope of the algorithm and help the algorithm jump out of the local optimal results.Then,the improved algorithm was applied to the calculation of the structural reliability index.Engineering practice shows the effective-ness of the improved algorithm.