Study on seismic behaviour of a new hybrid structure with shaking table test and numerical analysis

This paper presents a study on a hybrid high‐rise structure that has two structural systems: the main one is a mega‐frame consisted of mega‐columns, strengthened floors and the outrigger truss on the top; the secondary one consists of typical floors between the strengthened floors. Because of the complexity and innovation of the structural system, a detailed study, including shaking table test and numerical analysis, is needed to research the seismic property of the hybrid structure. First, a 1/50 shaking table model was tested by the State Key Laboratory for Disaster Reduction in Civil Engineering of Tongji University to obtain the frequencies of the free‐vibration modes and dynamic property of the model. Second, this paper used 3D finite element analysis software, named MIDAS, to build the numerical models. Two kinds of models were made to simulate the shaking table model and the prototype structure, respectively, and then a comparison between the analytical and experimental results was presented in this paper to verify the numerical models. In addition, the seismic behaviour of the prototype was analysed by the MIDAS. Finally, the structural system of the new hybrid structure was verified to be valid and applicable. Copyright © 2009 John Wiley & Sons, Ltd.