Performance-Based Seismic Design Principles and Structural Analysis of Shanghai Tower

Shanghai Tower is a 632 m high super tall building adopting innovative steel-concrete hybrid mega frame-core tube-outrigger lateral structural system. Since both of the height and irregularity of Shanghai Tower are far beyond the current Chinese design code provision, non-prescriptive performance-based seismic design (PBSD) approach is required to employ in the seismic design of this super tall building. The general PBSD methodologies of code-exceeding tall buildings are briefly introduced at first. According to PBSD principles of code-exceeding tall buildings, the seismic performance objectives are selected for Shanghai Tower. The design criteria for structural components and systems consistent with the performance objectives are established. The elasto-plastic time-history analysis of the structure under frequent, basic and rare earthquakes, respectively, is carried out with the aid of ABAQUS program. Seven sets of ground motions are selected as the input motions. The detailed numerical simulation results, such as the structural dynamic characteristics, the displacement responses, the base shear, the overturning moment, and the damage conditions, are presented. The structural analysis results indicate that the structure can meet the predetermined performance objectives with relatively large safety margin.