Seismic Responses Analysis on Basements of High-Rise Buildings Considering Dynamic Soil-Structure Interaction

Abstract

AbstractSoil-structure interaction is a research hotspot in the geotechnical and civil engineering, especially with the further accelerated development of urban high-rise buildings. Unlike previous studies focusing on the superstructures, this paper presents a numerical study on the seismic response characteristics of underground structures, i.e., the basements of high-rise buildings. To this end, a comprehensive model considering soil-basement-superstructure system was analyzed firstly, and the dynamic response of basement was divided into the kinematic interaction (KI) effect and inertial interaction (II) effect based on a theoretical framework. Then, a typical 25-story symmetric wall-frame structure with a 3-story basement was selected as the case to verify the founds obtained in theoretical analysis. The results demonstrate that: 1) Unlike the single underground structure, the dynamic response of basement would be significant amplified by the inertial interaction effect of superstructure (averagely enlarger by 1.524 times); and 2) There is a larger KI effect on basement whetever the superstructure exists or not. Therefore, it is necessary for seismic design of building basements to comprehensively consider the KI and II effects. In addition, this paper investigates the possibility on acquiring the KI and II effects with simplified methods according to the characteristics of two effects.KeywordsDynamic interactionSeismic responseUnderground subway stationGround adjacent buildingSoil-structure interaction