The Effects of Outrigger Type and Distribution on Seismic Behavior of Super-Tall Building

Document Type : Original Article

Authors

1 Department of Structural Engineering, Faculty of Civil Engineering, Istanbul Technical University (ITU), Istanbul, Turkey

2 Department of Structural Engineering, Faculty of Civil Engineering, Sahand University of Technology (SUT), Tabriz, Iran

3 Faculty of civil engineering, Istanbul Technical University

Abstract

Seismic performance and behavior of super-tall building is one of significant place of doubt while using energy dissipated outriggers. To enhance the seismic performance of super-tall building structures using outrigger is one common method; however, the performance and behavior of the outrigger varies based on the outrigger section and more importantly the elevation and multitude of outrigger in structure, that could cause great differences in seismic behavior of outrigger and the compressive force that is going to apply to mega columns. To evaluate the seismic performance of the building, a case study was carried out. The models was provided with two different outrigger and two different outrigger distribution and results was find out for each model to compare and present the best model that has the higher performance in whole building. The numerical models for the structures in different condition were established with the aid of ETABS software. The responses of the modeled buildings were obtained for TSC 2007 and TSC 2017 and compared. The results show that using outrigger at roof level could significantly affect the story displacement; however, it increases the periods at both X and Y directions.

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