基于时频域信息的混凝土坝材料动参数联合反演方法  

Joint inversion method of dynamic parameters for concrete dam materials based on time-frequency domain information

作　　者：方正[1,2] 苏怀智[1,2] FANG Zheng;SU Huaizhi(College of Water Conservancy and Hydropow-er Engineering,Hohai University)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学水灾害防御全国重点实验室,江苏南京210098

出　　处：《大坝与安全》2025年第1期1-8,共8页Dam & Safety

基　　金：国家自然科学基金资助项目(52239009);中央高校基本科研业务费专项资金项目(B240201028)。

摘　　要：获取混凝土坝材料动参数对混凝土坝抗震安全性能校核意义重大。目前,通过强震观测资料识别混凝土坝的模态参数,然后以此为依据构建目标函数进行材料动参数的优化是常见的做法。笔者在利用强震观测资料识别模态参数的同时,提取地震响应序列的时域指标,结合时频域信息构建目标函数进行材料动参数的联合反演。由于两个目标函数的单位、量纲不同,引入带精英策略的快速非支配排序遗传算法进行多目标优化计算,得到了混凝土坝材料动参数的Pareto最优解集。对某工程实例进行反演分析,结果表明基于时频域信息的混凝土坝材料动参数联合反演方法具有参数识别性能强、稳定性好的特点,在实际工程中具有良好的应用前景。Acquiring dynamic material parameters of concrete dams is of great significance for verifying their seismic safety performance.At present,a common approach involves identifying the modal parameters of concrete dams from strong motion observation data and then constructing an objective function based on this information to optimize the material′s dynamic parameters.In this paper,modal parameters are identified based on strong motion observation data while simultaneously time-domain indicators from the seismic response sequence are extracted.A joint inversion of material dynamic parameters is conducted by constructing an objective function that combines both time-domain and frequency-domain information.Since the two objective functions differ in units and dimensions,a multi-objective optimization calculation is performed using the fast non-dominated sorting genetic algorithm with elitism strategies to obtain the Pareto optimal solution set for the dynamic material parameters of the concrete dam.Inversion analysis of a specific engineering case demonstrates that the joint inversion method for concrete dam material dynamic parameters based on time-frequency domain information exhibits strong parameter identification performance and high stability,offering good application prospects in practical projects.

关 键 词：混凝土坝 材料动参数 联合反演 时频域信息 

分 类 号：TV41[水利工程—水工结构工程] TV624