Abstract
In this paper, three different damage indexes were used to detect nonlinear damages in two adjacent Reinforced Concrete (RC) structures considering pounding effects. 2-, 4- and 8-story benchmark RC Moment Resisting Frames (MRFs) were selected for this purpose with 60%, 75%, and 100% of minimum separation distance and also without any in-between separation gap. These structures were analyzed using the incremental dynamic analysis method under 44 far-field ground motion records. Comparison of the results between the MRFs with and without considering pounding effects show that collisions lead to a decrease in the values of coefficient of determination and the nonlinear damage occurs in lower seismic intensity. As a result, using the damage indexes, nonlinear damages can be detected during a specific seismic intensity. Moreover, considering a minimum separation distance leads to an increase in the coefficient of determination between the damage index and the maximum story drift ratio. Furthermore, due to pounding, shorter MRFs are damaged more significantly than the taller structures.
Highlights
Structural pounding due to insufficient gaps may cause collisions between adjacent structures during earthquakes
Three damage indexes have been considered for nonlinear damage detection in adjacent Reinforced Concrete (RC) structures considering pounding effects
Pounding between RC Moment Resisting Frames (MRFs) has been considered with 60%, 75%, and 100% of the minimum separation distance and compared to the case when structures vibrate independently
Summary
Structural pounding due to insufficient gaps may cause collisions between adjacent structures during earthquakes. The results showed that using the proposed methods, the impacts between two adjacent buildings due to earthquake-induced structural pounding can be prevented by ensuring sufficient minimum separation gap. The current research is focused on damage assessment in adjacent RC Moment Resisting Frames (MRFs) considering pounding effects under ground motion records. For this purpose, some illustrative benchmark structures, including 2- and 4-story as well as 4- and 8-story RC MRFs, were examined based on three damage indexes, i.e. Park and Ang index (Park and Ang 1985), modified Park and Ang damage index proposed by Kunnath et al (1992) and Consenza et al index (Cosenza et al 1993)
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