2D Dynamic Structure–Soil–Structure Interaction for Periodically Arranged Structure System Under Incident Plane SH Waves

Abstract

Dynamic structure–soil–structure interaction (SSSI) for periodically arranged structure system under incident plane SH wave is investigated using the indirect boundary element method. The solution is presented through response of an infinite number of equally spaced, identical structures (periodically arranged structure system) supported by rigid foundations embedded in a soil layer overlying elastic bedrock. The presented method has the advantages of high accuracy, low computational cost, and low memory requirement. In parametric analysis, whether only immediately adjacent structures contribute significantly to the structural response in dense areas is analyzed first. Numerical results showed that the structural response for periodically arranged structure system may be evidently different from that of a finite array of structures model. While the immediately adjacent structures have the most significant effect, the effect of farther structures is still non-negligible. Then, the effects of separation distance and soil layer are investigated. It is shown that the separation distance may reduce or amplify the structural response compared with that for single structure, which could be as large as 67.5% and 59.7%, respectively, for building relative displacement. The soil layer also has prominent influence. With decreasing soil layer stiffness or soil layer thickness, the building's relative displacement amplitude increases. The conclusions may be useful for prediction of seismic response for design and interpretation of recorded response of full-scale structures in densely built areas.