Performance-based Seismic Design of an Irregular Tall Building — A Case Study

The structural design of a 50-story tall reinforced concrete residential building, which was planned to be constructed in Istanbul and given up afterwards by the investor, has been completed in accordance with the draft version of Seismic Design Code for Tall Buildings in Istanbul that adopts performance-based seismic design as the basic approach as Tall Buildings Initiative Guidelines do. The seismic design of the building has formed the main part of the structural design process due to high seismicity of the proposed location and the extremely irregular floor plan not conforming to usual tall building structures. The building consists of two individual buildings linked through stronger link slabs at top 13 stories whereas relatively weak slabs at lower stories. The building has been designed for design basis earthquake by elastic response spectrum analysis and its seismic performance has been checked for maximum considered earthquake by nonlinear time history analyses carried out using PERFORM-3D.