Damping modification factors for the design of seismic isolation systems in Peru

Abstract

This study proposed a simple nonlinear equation to estimate damping modification factors (DMFs) to modify the elastic response spectral values for damping ratios between 10% and 50%. The DMFs are computed from the displacement, acceleration, and velocity response spectral of single-degree-of-freedom (SDOF) systems of 198 earthquake acceleration time histories from 40 earthquakes events of Peruvian database, grouped into three types of soil: hard soil, intermediate soil, and soft soil. For each soil group, 11 scaled records were selected according to the ASCE 7-16 standard to match the design spectrum of the Peruvian technical standard for seismically isolated structures E.031. Simplified approximate nonlinear period-dependent expressions were provided to compute DMFs from the Peruvian strong-motion database and were compared with DMFs available in the literature and national seismic design codes. The study showed discrepancies with the regulations worldwide.

An Investigation of Damping Modification Factors Corresponding to Different Damping Ratios for Sdof Systems

“…Priestley et. al suggested a revision for the DMF in Eurocode 8, especially for sites where forward directivity velocity pulse characteristics might be expected [9,17,[21][22][23][24][25].…”

Uso de Disipadores de Fluido Viscoso como medida de Reforzamiento Estructural

“…En Perú el primer edificio en ser equipado con disipadores viscosos fue la Torre del Aeropuerto Internacional en Lima [17], por otro lado el "Banco la Nación" de 30 niveles, los cuales mejoraron la respuesta sísmica debido al incremento del amortiguamiento interno de la estructura [18].…”

Spectral damping scaling factors for horizontal components of ground motions from subduction earthquakes using NGA-Subduction data

“…Furthermore, most of these available models are calibrated to recordings from shallow crustal earthquakes in active tectonic regions due to the relative abundance of such recordings. Very few studies have considered extensions of the DSF model to subduction zone earthquakes, and most of these studies are recent and limited to specific regions (Castillo and Ruiz, 2014; Daneshvar et al, 2016, 2017; Fernandez-Davila and Mendo, 2020; Miranda et al, 2020; Piscal and López-Almansa, 2018; Rezaeian et al, 2018; Zhao et al, 2019, 2020; Zhou and Zhao, 2020). Consequently, current building design regulations (e.g.…”

“…Most of these studies are recent and are only applicable to specific regions. Among these are Castillo and Ruiz (2014), Daneshvar et al (2016, 2017), Piscal and López-Almansa (2018), Miranda et al (2020), Fernandez-Davila and Mendo (2020), and Zhou and Zhao (2020) that provide DSFs for subduction earthquakes in Mexico, southwestern British Columbia (Canada), Colombia, Chile, Peru, and Japan, respectively. Castillo and Ruiz (2014) is the only model available for the Central America and Mexico region.…”

“…This model is applicable to periods of up to 4 s. Sensitivity analyses is done for soil type with the conclusion that it is less relevant compared to period, and therefore soil type is not used as a predictor variable in the Colombia DSF model. Fernandez-Davila and Mendo (2020) use local recent recordings in the Peru region for three types of soil conditions to develop a median model of DSF that is a function of period. The coefficients are provided for damping ratios larger than 5%.…”