Abstract
The present research aims to study the influence of the soil–structure interaction (SSI) and existence or absence of masonry infill panels in steel frame structures on the earthquake-induced pounding-involved response of adjacent buildings. The study was further extended to compare the pounding-involved behavior versus the independent behavior of structures without collisions, focusing much on dynamic behavior of single frames. The effect of SSI was analyzed by assuming linear springs and dashpots at the foundation level. The infill panels were modeled using equivalent diagonal compression struts. The steel frames were assumed to have elastic–plastic behavior with 1% linear strain hardening. The dynamic contact approach was utilized to simulate pounding between the adjacent buildings. Nonlinear finite element analysis was performed for two adjacent multi-story structures with four different configurations representing cases that can exist in reality. The seismic response of the studied cases generally emphasized that ignoring the soil flexibility and/or the contribution of the infill panels may significantly alter the response of adjacent structures. This may result in a false expectation of the seismic behavior of buildings exposed to structural pounding under earthquake excitation.
Highlights
Earthquake-induced pounding between buildings has been a topic of intensive research for more than three decades
For the bare frames (BF), considering the flexibility of the soil results in the slight increase in the natural periods of the buildings, as it can be seen from Table 1
The results of the study reveal that: 1. For the bare frames cases, considering soil–structure interaction (SSI) slightly increased the natural periods of buildings
Summary
Earthquake-induced pounding between buildings has been a topic of intensive research for more than three decades. Chouw and Hao (2005) investigated the effect of the spatial distribution of the seismic excitation and the influence of the soil flexibility on the pounding-involved response of two adjacent bridge frames. The results showed that pounding and SSSI effects worsen the adjacent buildings’ conditions because pounding amplifies their shear responses and accelerations Despite these limited studies described above, all other investigations, which were focused on earthquake-induced structural pounding, ignored the flexibility of the soil. Pounding between two adjacent multi-story RC unequal height structures was investigated by Favvata et al (2012) taking into account the contribution of infill panels modeled as equivalent diagonal struts according to FEMA 273 (1997). Karayannis et al (2011) studied the effect of external beam–column joints on the mechanics of collapse in multi-story structures using the equivalent diagonal strut model to simulate the behavior of infill panels. The study was further extended to compare the pounding-involved behavior versus the independent behavior of structures without collisions, focusing much on dynamic behavior of single frames
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