Document Type: Regular Paper
Islamic Azad University
Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
Due to the supposed lack of significant importance of the seismic rotational components in the past decades, they were overlooked in the seismic evaluation of structural behavior. As long as researchers measured seismic components more accurately using sensitive rotational velocity sensor and specific methods. It was observed that the magnitude of rotational components was considerable and could not be neglected. Hence, some parts of seismic damage or failure of structures cannot be exclusively attributed to the translational components. In this regard, this paper used seven accelerograms in which rotational components were measured by advanced sensors. The considered RC buildings which designed as per intermediate moment-resisting frame system were analyzed using OpenSees in nonlinear dynamic domain. In the numerical modeling, lumped plasticity model was used to simulate the behavior of RC component members considering the rotational motions and soil-structure interaction as main parameters. The results of numerous nonlinear time history analyses showed that the rotational component contribution to the seismic behavior of RC frames is considerable and should be included in seismic design codes. So that, considering the soil-structure interaction and the seismic rotational components lead respectively to the 25% reduction and 40% increase in analysis results.