Seismic Fragility Analysis of Buildings Based on Double-Parameter Damage Models considering Soil-Structure Interaction

Abstract

Most conventional seismic fragility analyses of RC buildings usually ignore or greatly simplify the soil-structure interaction (SSI), and the maximum interstory drift ratio (MIDR) is often adopted to establish seismic fragility curves. In this work, an eight-story RC building was designed to study the influence of the SSI on the seismic fragility of RC buildings. Three double-parameter damage models (DPDMs) were considered for the fragility assessment: the Park–Ang model, the Niu model, and the Lu–Wang model. Results show that considering SSI induces a higher fragility than that of the fixed model and that employing the DPDMs for the fragility analysis provides more reasonable results than those evaluated using the MIDR damage index.

Soil-structure interaction response considering drift analysis due to three orthogonal components of near-field ground motions

“…As seen in Figures 15 and 16, the maximum inter-story drift, derived from the SSI analysis, appears in the first story. Previous studies also mentioned that the maximum inter-story drift appears in the first floor of the moment-resisting frame buildings constructed on soft soil when the SSI was considered in the analysis [10,[43][44][45]. Also, researchers have indicated that base flexibility results in the large displacement of the first story [46,47].…”

Calculating the Dynamic Impedances of Foundations and their Effect on the Seismic Response of Structures: Analytical and Numerical Study

“…The soil model used in the numerical analysis has dimensions in 3D of 70×20×10 m 3 , where soil is 10 times larger than the structure [31], in order to ensure freefield movement. Soil is represented as a semi-finite domain, which requires the use of dampers at its boundaries to absorb seismic waves and avoid their reflection.…”