Effects of Earthquake Source, Path, and Site Conditions on Damping Modification Factor for the Response Spectrum of the Horizontal Component from Subduction Earthquakes

Abstract

Damping modification factors (DMFs) are important for estimating the response spectrum for the design of structures with different damping ratios. This study investigated the effects of earthquake source parameters (magnitude, source depth, and source categories), source distance (the closest distance from a site to a fault plane for large earthquakes and hypocentral distance for the other events), and site conditions on DMFs for the displacement and acceleration response spectra of the horizontal components of the records from Japan. This study used a total of 14,713 strong‐motion records from the KiK‐net and K‐NET to compare the DMFs from three earthquake category groups, namely shallow crustal and upper mantle, subduction interface, and subduction slab earthquakes. Statistical tests were carried out to determine whether the DMFs from these three types of earthquakes differ significantly from each other. The test results show that, between each pair of the three types of earthquakes, the DMFs for both displacement and acceleration response spectra differ significantly in terms of statistical tests and practically for engineering applications at many spectral periods, with the largest difference over 40%. The effects of earthquake category and site conditions for acceleration spectrum are similar to those of the displacement spectrum at short periods up to about 0.3 s but are much larger than those of the displacement spectrum at long spectral periods. The effects of magnitude and earthquake depth are also significant. Therefore, separate DMF models for the response spectrum of the horizontal component should be derived for each type of earthquake and should account for the effects of earthquake source and path parameters and site conditions.

Seismic Analysis of Double Unit Tunnel Form Building Subjected to Out-of-Plane Lateral Cyclic Loading

“…The damping coefficient was also affected by peak ground acceleration (PGA), epicenter, and depth of the earthquake and not only the magnitude. Each type of seismic event occurring at different spectral periods produced different effects to the reinforced concrete building [11].…”

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

“…Separating the data into interface and intraslab earthquakes is necessary to capture the systematic differences between the DSFs of these two tectonic regimes as also noted by Daneshvar et al (2016, 2017) and Zhao et al (2019). Furthermore, having two models helps with the application of the DSF to GMMs, which are also developed separately for interface and intraslab earthquakes.…”

“…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.…”

“…Finally, Zhao et al (2019) look at the effects of earthquake source, path, and site conditions on DSF for subduction earthquakes in Japan. They use records from global crustal databases (NGA-West2) to investigate the differences between different types of earthquakes and recommend that separate DSF models should be developed for the three different types of earthquakes (crustal, interface subduction, and intraslab subduction earthquakes).…”