基于改进遗传算法的阻尼器位置与数量优化分析

为实现大跨网架结构上黏滞阻尼器位置和数量的优化,以替换杆件模态应变能百分比之和取得最大值为目标函数,以结构节点位移、加速度和杆件应力的峰值为优化控制指标,采用Matlab编写并验证改进的遗传算法优化程序.基于优化结果,采用ANSYS对网架结构在多遇、罕遇地震作用下的震动控制效果进行数值模拟对比分析.结果表明,阻尼器优化布置方案减震效果良好,明显改善结构受力状况;以安全性及经济性为优化目标,得到最佳方案,总结出大跨网架中黏滞阻尼器的布置规律,对实际工程减震设计具有参考意义.

Optimal Analysis on Location and Quantity of Dampers Based on Improved Genetic Algorithm

In order to optimize the location and quantity of viscous dampers on the large-span truss structure, the maximum value is obtained by summing the percentage of modal strain energy of replacement bars, and thus taken as the objective function. The peak values of node displacement, acceleration and element stress are regarded as the optimization control index. In addition, Matlab is adopted to verify an adaptive genetic algorithm optimization program. Based on the optimization result, the seismic control effect of the optimized truss structure under the frequent and rare seismic is compared through ANSYS analysis. The results show that the optimized scheme of damper has superior damping effect, which can obviously improve the stress situation of structure. Therefore, the best optimization scheme is obtained and the rules for optimal location of viscous dampers in large-span truss structures are summarized through taking safety and economy into account, which is of reference significance for the actual engineering damping design.