An Investigation on Seismically Isolated Buildings in Near-Fault Region

Abstract

Earthquake ground motions are affected by the earthquake magnitude, topographic features, and the geological structure of the ground, as well as the distance of the area under the earthquake to fault. The ground motions close to the fault are quite different from ground motions away from the seismic source. The ground motions, which are at about 20 km from the rupture are generally named as near-fault (NF) ground motions [1][2][3][4]. Some recent earthquakes like as Northridge 1994, Kobe 1995, 1999 Chi-Chi etc. are known as a short-duration impulsive motion that exposes the structure to high input energy at the beginning of the motions [5]. These motions have velocity pulse amplitude. This specialty cannot be seen in records obtained far-field (FF) regions [6]. The velocity pulse duration must be larger than 1.00 second and also the ratio of the peak ground velocity (PGV) to the peak ground acceleration (PGA) must be larger than 0.10 second [7].Two main categories of the NF ground motions are fling-step and forward-directivity, respectively. The fling-step motions cause permanent static displacement in ground, whereas directivity effects do not create permanent displacement. Comparison to the FF ground motions, directivity-effects having the long-period and high-density and the fling-step effect causing permanent static ground displacements, are destructive for structures [8].

A Study on Efficiency of Perfectly Matched Layer (Pml) for Seismic Soil-Structure Interaction

“…to represent infinite soil media. For modeling the infinite soil media, a radiation condition between far-field and near field has to be satisfied (Sesli andAkköse, 2013: Sesli, 2022).…”

Using supplemental linear viscous dampers for experimentally verified base-isolated building: Case study

“…Recent advances in seismic isolation have led many developed countries, including Italy (2008), the USA (2009), Japan (2010), China (2010), Taiwan (2011), and Turkey (2018), to update their building regulations and encourage seismically isolated construction. Studies by Yurdakul et al [5], Zhuang et al [6], Sheikh et al [7], Sesli et al [8], and Losanno et al [9] show that a great deal of effort has been made and is still being made to enhance the seismic response of structures using base isolators. "Elastomeric bearing systems" and "friction pendulum bearing systems" are the two basic isolation system types chosen in these studies.…”

Shear oscillations of bridge on sliding foundation during earthquake

“…This avoids a resonance state between the ground's acceleration and the structure's vibrations. Different types of insulation systems and their use are discussed in [18][19][20][21][22][23].…”