The progressive social, economic development and advancement of new engineering and construction techniques, high-grade materials, steel, welded connections and light facades (do not impart in the strength of structure) motivating architects and engineers to construct peculiar light, tall buildings to display their spirit, inventiveness and design concept. 432 Park Avenue (New York), World Trade Centre (New York)), these shapes were less associative with torsional-vibrations by seismic loads due to eccentricity. In past decades, shapes of the tall buildings were traditional and symmetrical having square, rectangular, triangular, circular etc.
1 shows some of the tall buildings which are top 10 tallest buildings in the world. Increasing demand for business and residential space, economic growth, innovation in structural systems has led to the scope of vertical expansion of the buildings thus occupying the less precious area and in the coming decades, maximum cities of developed and developing countries would be seen with the more cohesive skyline. The present study comprehensively reviews the recent/past aerodynamic modification techniques applied to high-rise buildings. minor modifications (corner cut, rounding, chamfer etc.) and major modifications (taper, set-back, twist etc.). Based on the impact of modification on the outer architecture of the building, the aerodynamic modifications are categorized in two groups i.e. Among these methods, aerodynamic modification techniques are very potent, which affect the mechanism of vortex shedding phenomenon considerably and have got a lot of attention in recent years.
To safeguard the functional requirement of tall flexible buildings and to mitigate the excitations, various methods are available. Generally shape and orientation of the building are determined on the basis of architectural and practical considerations, but the wind-induced excitations encouraged by bluffness of the building shapes cannot be neglected also. The buildings are going taller and unconventional shaped rather than traditional. With the advancement in construction and engineering techniques, a pragmatic shift in architectural designs of tall buildings can be observed.
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