PERFORMANCE ASSESSMENT OF DIFFERENT TABULAR SYSTEMS FOR TALL BUILDINGS AGAINST DYNAMIC WIND AND EARTHQUAKE EFFECTS

Structural system selection for tall buildings against lateral wind and earthquake loads is of great importance in view of minimum material use and structural weight. Structural systems, for tall buildings, have been classified into four main groups, namely rigid frames, shear walls, combined wall-frame structures and tube systems (Kheyroddin et al., 2012). In the tube system category, Tube in Tube (TiT), Braced Bundled Tube (BBT) and Bundled Tube (BT) are the most popular structural configurations in order to reduce the shear lag in tall buildings (Taranath, 2010). Number of studies has been conducted to compare various lateral-resisting systems in tall buildings against wind and earthquake effects (Kakde et al., 2017; Mulla & Srinivas, 2015). The comparative study of the mentioned tube system categories has not been addressed in previous studies. Furthermore, in previous studies, the dynamic effects of wind load are neglected. The main originalities of this paper are to compare the behavior, assess the performance and evaluate the optimality, in view of structural weight, of the mentioned configurations against dynamic effects of wind and earthquake loads. As a case study, the existing 58-story building in Dalas, USA is modeled applying the three mentioned systems. The wind load is affected by equivalent static and time history dynamic methods, separately. The earthquake load is affected applying the spectrum method based on UBC-94 design spectrum. For the mentioned structural configurations, Shear Lag Index (SLI) and Displacement Index (DI) are compared.