Seismic behavior assessment of RC precast frame damaged in Bojnord Earthquake 2017 considering soil-structure interaction effects

Experiences of previous earthquakes shows the effects of soil-structure interaction and behavior of beam-column connections on the seismic behavior of the building structures. In this research, seismic vulnerability assessment of RC precast Frames was investigated by consideration of the effect of soil-structure interaction and nonlinear behavior of beam-column connections. The RC precast building represented in this study, damaged in Bojnord earthquake 2017 and located on the soil type II of Iranian seismic design code. The soil-structure interaction is modeled using Beam-on-Nonlinear-Winkler foundation. In this procedure, an array of vertical q–z springs is used to capture vertical and rotational resistance of the foundation, while two springs, namely p–x and t–x, are placed horizontally to capture the passive and sliding resistance of the foundation, respectively. The seismic vulnerability and performance of RC precast frames are evaluated using nonlinear static pushover, nonlinear dynamic time history analyses and incremental dynamic analyses (IDA). The numerical models are developed using OpenSees software by consideration of nonlinear behavior of the beam-column joint. The numerical results are shown the significant role of soil-structure interaction and beam-column connections on the seismic vulnerability and performance of RC precast buildings. In fact, seismic vulnerability of RC precast buildings are increased by considering soil-structure interaction and beam-column connections effects.