评估地震引起的土坝坝顶沉降的地震烈度测量方法和预测方程

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-04-24 DOI:10.1002/eqe.4135
Andrea Nardo, Giovanni Biondi, Orazio Casablanca, Giuseppe Di Filippo, Ernesto Cascone
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引用次数: 0

摘要

本文介绍并讨论了对分区土坝进行二维动态有限元分析的结果,目的是检测适当的强度措施,以描述坝顶永久沉降随输入地面运动特征的变化。我们选择了大量地震记录的水平分量,并将其作为考虑上下游方向的输入运动。这有助于探索大坝堤坝塑性机制的激活和水平加速度的放大。根据分析结果,发现了两种与输入运动的振幅、能量和频率含量相关的原始强度测量方法,并得出了原始经验预测公式,用于估算大坝的永久坝顶沉降。所提出的烈度测量方法的有效性,以及这些烈度测量方法与地震引起的永久坝顶沉降之间的新型关系的可靠性,已通过以下方面进行了检验:(i) 使用其他输入运动集对同一大坝进行进一步动态分析的数值结果;(ii) 文献中关于其他两个土坝的数值结果;(iii) 与最近两次大地震引起的四个土坝坝顶沉降有关的现场数据。根据整套分析结果,确定了一个经验方程,该方程似乎可以作为地震引起的土坝坝顶沉降的通用预测工具。
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Seismic intensity measures and predictive equations for the evaluation of earthquake—induced crest settlements of earth dams

In this paper the results of 2D dynamic finite element analyses of a zoned earth dam are presented and discussed with the aim of detecting proper intensity measures able to describe the variation of the crest permanent settlement with the characteristics of the input ground motion. A large set of horizontal components of earthquake records has been selected and used as input motion considering both upstream and downstream directions. This allowed to explore the activation of plastic mechanisms in the dam embankment and the amplification of the horizontal accelerations. Starting from the analysis results, two original intensity measures, related to the amplitude, energy and frequency content of the input motion, have been detected and original empirical predictive formulas have also been derived to estimate the permanent crest settlement of the dam. The effectiveness of the proposed intensity measures and the reliability of the novel relationships between these intensity measures and earthquake-induced permanent crest settlements have been checked against (i) numerical results of further dynamic analyses carried out for the same dam using additional sets of input motions, (ii) numerical results available in the literature for two other earth dams and (iii) field data relative to the crest settlements induced in four earth dams by two recent large earthquakes. The whole set of analysis results allowed defining an empirical equation that appears as a promising general predictive tool for the earthquake-induced crest settlement of earth dams.

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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
期刊最新文献
Issue information Issue information SSI-induced seismic earth pressures on an integral abutment bridge model: Experimental measurements versus numerical simulations and code provisions Estimation of inelastic displacement ratio spectrum for existing RC structures via displacement response spectrum Linear equivalence for motion amplification devices in earthquake engineering
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