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Intensity and damage statistics of the September 19, 2017 Mexico earthquake: Influence of soft story and corner asymmetry on the damage reported during the earthquake
Earthquake Spectra ( IF 5 ) Pub Date : 2021-01-02 , DOI: 10.1177/8755293020981981
Eduardo Reinoso 1, 2 , Pablo Quinde 1 , Luis Buendía 2 , Salvador Ramos 1
Affiliation  

A destructive intraslab earthquake occurred in Mexico City on September 19, 2017 (Mw 7.1), causing significant damage and hundreds of human losses not only in the epicentral area, but also in the States of Morelos, Puebla, Mexico and in Mexico City. Only in Mexico City itself, around 230 people died, and more than 40 buildings collapsed. The intensities recorded in some lakebed areas of the city, especially in zones with soil periods around 1.5 s, were relatively high, even surpassing spectral values of 1.0 g; the vertical component, due to the proximity of the earthquake, was unusually high for Mexico City. The 2017 earthquake raised questions critical to understanding the city’s seismic vulnerability and resilience, and they are partly answered in this article. Using 77 accelerometric stations, the amplification pattern of the seismic intensities is characterized as well as the correlations of buildings structural characteristics with the site effects. A comprehensive statistical analysis of the damages is shown to analyze and understand the structural behavior of damaged buildings. It is including not only the structural types and the year of construction, but also the main structural problems identified (structural pathologies), such as irregularities, both in elevation and plan, soft story, and corner effect. The building damage database was constructed with 2125 reports of buildings carried out by universities and engineering associations after the earthquake, of which 543 had severe damage. It is also included the information of all buildings with no damage in the city thanks to the cadastral information provided by the Mexico City government, and post-earthquake inspections and visual inspections using Google Street View. A full study of selected neighborhoods, which compares similar buildings with and without damage, is included, yielding relevant statistical information on which pathologies cause more damage and even collapses.



中文翻译:

2017年9月19日墨西哥地震的强度和破坏统计数据:软故事和拐角不对称对地震期间报告的破坏的影响

2017年9月19日,墨西哥城发生了破坏性的平板内地震(Mw 7.1),不仅在震中区域,而且在莫雷洛斯州,普埃布拉州,墨西哥州和墨西哥城造成了重大破坏,数百人丧生。仅在墨西哥城本身,就有约230人死亡,超过40座建筑物倒塌。在城市的某些湖床地区,特别是在土壤周期约为1.5 s的地区,记录到的强度相对较高,甚至超过了1.0 g的光谱值。由于地震的临近,垂直分量对于墨西哥城来说异常高。2017年的地震提出了一些问题,这些问题对于理解这座城市的地震脆弱性和韧性至关重要。本文部分回答了这些问题。使用77个加速度计测站,表征了地震烈度的放大规律,以及建筑物结构特征与场地效应的相关性。显示了对破坏的综合统计分析,以分析和了解受损建筑物的结构行为。它不仅包括结构类型和建造年份,还包括已识别的主要结构问题(结构病理),例如高程和平面上的不规则性,软层和拐角效应。建筑损坏数据库由地震后大学和工程协会进行的2125份建筑物报告构成,其中543处遭受了严重损坏。由于墨西哥城政府提供的地籍信息,以及使用Google Street View进行的震后检查和外观检查,还包括城市中所有未受损建筑物的信息。其中包括对选定街区的全面研究,将有或没有损坏的类似建筑物进行了比较,得出有关哪些病理会造成更大损坏甚至倒塌的相关统计信息。

更新日期:2021-01-02
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