基于信息度量的地震动参数优化选择方法

祝柏杨1,2,刘金龙1,2,林均岐1,2

振动与冲击 ›› 2024, Vol. 43 ›› Issue (15) : 86-94.

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PDF(3388 KB)
振动与冲击 ›› 2024, Vol. 43 ›› Issue (15) : 86-94.
论文

基于信息度量的地震动参数优化选择方法

  • 祝柏杨1,2,刘金龙1,2,林均岐1,2
作者信息 +

Optimization selection method for intensity measures based on information metrics

  • ZHU Boyang1,2, LIU Jinlong1,2, LIN Junqi1,2
Author information +
文章历史 +

摘要

地震动参数(intensity measures,IM)的选择是地震易损性分析的重要环节。合适的IMs应具有良好充分性和效率性,以更好地反映地震动的破坏能力,获得更为可靠的易损性分析结果。为此,本文提出了一种基于信息度量的地震动参数优化选择方法。该方法利用互信息和相对熵度量作为IM选择的通用指标,结合前向选择算法在一到多维空间中高效地定位最优的IM。为了验证所提方法的有效性,在一组简支梁桥上进行了分析和讨论,并与传统的充分性和效率性分析方法进行了对比。结果表明,基于所提出方法所选择的IMs能同时满足充分性和效率性要求。较传统方法而言,所提出的方法不依赖概率地震需求模型的选择且不需要进行繁琐的条件独立性比较,具有高效普适的优势,有着良好的应用前景。

Abstract

The selection of intensity measures (IMs) is an important part of seismic fragility analysis. Suitable IMs should have good sufficiency and efficiency to better reflect the destructive capacity of ground motion and obtain more reliable fragility analysis results. For this reason, this paper proposes an optimal selection method of IMs based on information metrics. The method utilizes mutual information and relative entropy metrics as common indicators for IMs’ selection, which are combined with a forward selection algorithm to efficiently locate the optimal IMs in one to multi-dimensional space. To verify the effectiveness of the proposed method, it is analyzed and discussed on a set of simply supported girder bridges, and compared with the traditional sufficiency and efficiency analysis methods. The results show that the selected IMs based on the proposed method can satisfy the sufficiency and efficiency requirements simultaneously, and have the advantage of high efficiency and universality compared with the traditional method, which does not rely on the selection of probabilistic seismic demand model and does not need to carry out the cumbersome comparison of conditional independence, has a good application prospect.

关键词

地震易损性 / 地震动参数 / 优化选择 / 互信息 / 相对熵

Key words

fragility / seismic intensity measures / optimal selection / mutual information / relative entropy

引用本文

导出引用
祝柏杨1,2,刘金龙1,2,林均岐1,2. 基于信息度量的地震动参数优化选择方法[J]. 振动与冲击, 2024, 43(15): 86-94
ZHU Boyang1,2, LIU Jinlong1,2, LIN Junqi1,2. Optimization selection method for intensity measures based on information metrics[J]. Journal of Vibration and Shock, 2024, 43(15): 86-94

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