Impact of initial stress field heterogeneity in dynamic soil–structure interaction

This article covers the impact of soil initial stress field heterogeneity (ISFH) in wave-passage analysis and prescribed structural acceleration context dynamic soil–structure interaction (DSSI) analysis. ISFH is directly related to natural behavior where a significant increase net effective confinement, as case foundation under building, tends soil’s modulus strain. creates heterogeneous vicinity elements, which results modification system. A simple method for considering on value strain was developed using direct DSSI approach. The used analyze numerical artifacts its surface values nonlinear two-dimensional (2D) deposit transient loading. followed by sample application three-story, three-bay concrete moment-resisting frame structure erected deep deposit. Floor relative displacement were comparison. modeled typical geotechnical properties fine-grained, post-glacial samples obtained Eastern Canada from situ borehole drilling, geophysical surveys, laboratory testing. Ground motion based eastern calibrated seismic signals. show that had values. effect found be period-dependent have at base structure. Thus, failure take effects into consideration can lead errors calculating accelerations (i.e. over- or underestimation).