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When high-rise buildings are subjected to intense earthquake ground motions, deformation concentrates into a restricted lower part of a building frame in the process of collapse even though it is designed in accordance with the strong-column-weak-beam concept. This paper examines the mechanisms behind the deformation concentration based on the modal decomposition of displacement increment using the tangent stiffness matrix. An improved criterion is proposed for predicting the deformation concentration region based on the presented mechanism. Furthermore, this paper studies the influence of large rotation and column yielding on dynamic collapse, which were neglected in the above examination.

EXAMINING MECHANISMS BEHIND DEFORMATION CONCENTRATION INTO LOWER STORIES BASED ON MODAL DECOMPOSITION USING TANGENT STIFFNESS MATRIX