Seismic Performance Evaluation of Double‐Skin Semi‐Base‐Isolated Building Using Incremental Dynamic Analysis

Abstract

Base isolation is a widely accepted earthquake damage prevention technique. is method decouples the superstructure from the base by putting a flexible layer under each column, thereby elongating the time period of structures. Semi-base isolation (SBI) in double-skin structures is an effective technique to reduce the dynamic responses of structures due to earthquake motions, by utilizing the isolation devices in part of it instead of the entire base. is study presents a double-skin structure consisting of outer fixed base frames with shear walls that have been detached from the inner core with a minor gap. e inner core of the structure has been dissociated from the base using the elastomeric bearings. Seismic response of 10-story double-skin structure with inner isolated core was compared to that of inner fixed base core to consider the yielding and collapse probability of the structure using the incremental dynamic analyses (IDA). e results showed that the time period in SBI buildings can be adjusted with the use of coupling beams between the inner and outer frames. Also, the time period and interstory drift ratio are both reduced as more floors are given coupling beams. However, these coupling beams are the most effective at the topmost floors.

Stochastic design of double-skin façades as seismic vibration absorbers

“…Moreover, the authors advise to have at least one connection between DSF and building at each storey level aiming to avoid large displacements of the façade. Similar outcomes are also suggested by Parsaeimaram et al [24], where the authors investigated the effects of removing or adding the connection beams between a base isolated building and the DSF.…”

Analytical Evaluation of MCE Collapse Performance of Seismically Base Isolated Buildings Located at Low-to-Moderate Seismicity Regions

“…In this methodology, the CMR is computed as a ratio of the median collapse intensity to the representative intensity of an ensemble of MCE ground motion records. Using the FEMA P695 procedure, the seismic fragilities of isolated buildings were evaluated using an incremental dynamic analysis method [18]. Nakazawa et al [19] investigated the effects of limiting the displacement demands of isolators by the use of moat walls with various clearances and behavior.…”