Prediction of residual displacement ratios for simple structures built on soft-soil sites of Mexico City

Discussion of Post-earthquake fast damage assessment using residual displacement and seismic energy: Application to Mexico City

“…A comprehensive literature review on the effect of degrading features in the estimation of residual displacements for SDOF systems is found in Liossattou and Fardis (2015). In particular, Ruiz-García and Miranda (2005), Guerrero et al (2017), and Ruiz-García and Guerrero (2019) studied the effects of hysteretic behavior (e.g. post-elastic stiffness and unloading stiffness) on residual displacements specifically for the case of structures built on soft soils using ground motions recorded in Mexico City, and they noted that unloading stiffness has a large effect on reducing residual displacements and, in particular, the ordinates of m d .…”

“…Although the literature review in their previous article is somewhat better (Quinde et al, 2020), it also misses many important and relevant issues such as the large record-to-record variability of residual displacements, the influence of post-elastic stiffness in bilinear and trilinear systems, the effect of stiffness-degrading behavior, the significance of damping ratio, spectral trend of m d , and so on. For instance, Ruiz-Garcia and Miranda (2005), Guerrero et al (2017), Ruiz-García (2018), and Ruiz-García and Guerrero (2017, 2019) conducted extensive statistical studies of the estimation of x res and m d by using ground motions recorded on soft soil deposits of Mexico City and introduced various simplified equations to obtain estimates of these residual displacements. In particular, the study by Ruiz-García and Miranda (2005) has been publicly available from the website of Stanford’s John A. Blume Center of Earthquake Engineering for more than 16 years, and, to the best of our knowledge, was the first study not only to point out the significant differences in x res and m d that exist for structures built on soft soils from those on structures built on rock or firm soils but also to propose a probabilistic approach for the estimation of x res .…”

RESPONSE TO Discussion by J. Ruiz-García and E. Miranda on “Post-earthquake fast damage assessment using residual displacement and seismic energy: Application to Mexico City”

“…Other references, such as Ruiz-García and Ramos-Cruz (2020), Ruiz-García and Guerrero (2019) and Bravo-Haro and Elghazouli (2018), were not included since they were published after the authors sent in the latest version of the paper .…”

“…Although the literature review in their previous paper is somewhat better (Quinde et al, 2020), it also misses many important and relevant issues such as the large record-to-record variability of residual displacements, the influence of post-elastic stiffness in bilinear and trilinear systems, the effect of stiffness-degrading behavior, the significance of damping ratio, spectral trend of md, etc. For instance, Ruiz-García and Miranda (2005), Guerrero et al (2017), Ruiz-García (2018), and Ruiz-García and Guerrero (2017, 2019) conducted extensive statistical studies of the estimation of xres and md by using ground motions recorded on soft soil deposits of Mexico City and introduced various simplified equations to obtain estimates of these residual displacements. In particular, the study by Ruiz-García and Miranda (2005) has been publicly available from the website of Stanford’s John A. Blume Center of Earthquake Engineering for more than 16 years, and, to the best of our knowledge, was the first study not only to point out the significant differences in xres and md that exist for structures built on soft soils from those…”

“…Ruiz-Garcı´a and Miranda (2005) was not cited in the paper since recent work carried out by the same authors, referenced in Quinde et al (2019Quinde et al ( , 2020, covers most of the topics discussed in that reference. Other references, such as Ruiz-Garcı´a and Ramos-Cruz (2020), Ruiz-Garcı´a and Guerrero (2019) and Bravo-Haro and Elghazouli (2018), were not included since they were published after the authors sent in the latest version of the paper.…”