This work evaluates the damage to and collapse of a set of buildings in the September 2017 earthquake in Mexico City; these buildings were also subjected to the September 1985 Mexico City earthquake. These buildings were located in the area of the highest rate of damage or collapse in 1985, but buildings exhibiting significant damage or collapse in 2017 did not possess any retrofitting. The spectral demands for these buildings, based on typical records registered in the earthquakes of 1985 and 2017, were not much different, suggesting the need to explain why the buildings that collapsed suffered severe damage in 2017 but not in 1985. This building behavior was analyzed using a seismic damage index Id, previously proposed by the author, which considers the effect of cumulative damage. The results indicated that the observed damage to and collapse of these buildings in the September 2017 earthquake can be explained by the effect of cumulative seismic damage. Recommendations are given for possible improvements to the seismic building codes in Mexico.

中文翻译：

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对 2017 年 9 月 19 日地震期间在墨西哥城观察到的建筑响应累积损坏的解释

这项工作评估了 2017 年 9 月墨西哥城地震中一组建筑物的损坏和倒塌；这些建筑物还遭受了 1985 年 9 月墨西哥城地震的影响。这些建筑物位于 1985 年损坏或倒塌率最高的区域，但 2017 年出现严重损坏或倒塌的建筑物没有进行任何改造。根据 1985 年和 2017 年地震中记录的典型记录，这些建筑物的光谱需求没有太大差异，这表明需要解释为什么倒塌的建筑物在 2017 年而不是 1985 年遭受了严重破坏。分析了这种建筑行为使用作者之前提出的地震损伤指数Id，它考虑了累积损伤的影响。结果表明，在 2017 年 9 月地震中观察到的这些建筑物的损坏和倒塌可以用累积地震损坏的影响来解释。对墨西哥抗震建筑规范的可能改进提出了建议。