| 王晓玲,李清梦,刘宗显,余佳,余红玲,王昊东.融合时频空间特征的土石坝地震易损性分析改进MLP模型研究[J].水利学报,2024,55(1):13-23 |
| 融合时频空间特征的土石坝地震易损性分析改进MLP模型研究 |
| Research on improved MLP model for seismic fragility analysis of rockfill dam by embedding spatial features of time-frequency |
| 投稿时间：2023-05-23 |
| DOI：10.13243/j.cnki.slxb.20230297 |
| 中文关键词: 土石坝 地震易损性 地震动时频空间特征 地震需求模型 胶囊网络 多层感知机 小波变换 |
| 英文关键词: earth-rockfill dam seismic fragility spatial features of time-frequency of ground motion seismic demand model CapsNet MLP wavelet transform |
| 基金项目:天津市自然科学基金项目(22JCQNJC01150) |
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| 中文摘要: |
| 针对现有地震易损性分析中采用的峰值加速度、峰值速度等地震动指标未能充分反映地震动复杂的时频空间特征，且现有基于对数空间线性函数关系假设的地震需求模型难以揭示地震动指标与地震响应间复杂非线性关系的问题，提出一种融合时频空间特征的土石坝地震易损性改进多层感知机(Multi Layer Perceptron，MLP)模型。该模型利用胶囊网络(Capsule Network，CapsNet)能够充分捕捉和表征目标特征空间位置分布的优势，从地震动小波时频图中提取反映地震动时频空间分布的深层特征，并以特征拼接的方式与既有特征进行融合，构建地震动融合指标;进一步地，采用树形Parzen优化算法(Tree structured Parzen Estimator，TPE)对MLP的神经元数量、学习率等超参数进行优化，提出基于TPE-MLP的土石坝地震需求模型，以反映地震动融合指标与地震响应间的复杂非线性关系，进而实现土石坝地震易损性的可靠分析。案例分析表明，相比于既有地震动指标，基于地震动时频空间特征融合指标的土石坝地震需求模型的MAE降低了40.5%，表明了所提模型的可靠性和优越性。 |
| 英文摘要: |
| In view of the fact that the present ground motion indexes such as peak acceleration and peak velocity used in seismic fragility analysis do not fully reflect the complex spatial features of time-frequency of ground motion，and the current seismic demand model based on the assumption of linear function in logarithmic space is difficult to reveal the complex nonlinear relationship between ground motion index and seismic response，an improved multilayer perceptron(MLP)model for seismic fragility of earth-rockfill dams by embedding spatial features of time-frequency is proposed.The model makes use of the advantage that capsule network(CapsNet)can fully capture and characterize the spatial location distribution of target features，extract the deep features reflecting the spatial features of time-frequency distribution of ground motion from the Wavelet time-frequency diagram of ground motion，and merge them with traditional features in the way of feature splicing to construct the ground motion fusion index.Furthermore，the super parameters such as the number of neurons and learning rate of MLP are optimized by Tree structured Parzen Estimator(TPE)，and the seismic demand model of earth-rockfill dam based on TPE-MLP is proposed to reflect the complex nonlinear relationship between ground motion fusion index and seismic response，so as to realize the reliable analysis of seismic fragility of earth-rockfill dam.The case study shows that，compared with the traditional ground motion index，the MAE of the earth-rockfill dam seismic demand model based on the ground motion spatial features of time-frequency fusion index is reduced by 40.5%，indicating the reliability and superiority of the proposed model. |
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