Dynamic Wind Analysis for High Rise Building—Typical Observations

In high-rise structures, wind is a critically load that must be thoroughly considered to ensure the safety and serviceability of the building. Various codes of practice are utilizing in different countries to design tall buildings, considering wind loads. However no single book comprehensively covers the static and dynamic behavior of the structure at a particular height. Moreover, it is essential to compute the critical effects and assess the dynamic behavior of the structure in accordance with the relevant modified provision in IS 875-2015 (part 3). This study aims to investigate the dynamic wind analysis for a G+33 building by generating an excel sheet for both static and dynamic analyses. The analysis will be conducted for different terrain categories (i.e., terrain category I, II, III & IV) and wind speed (i.e., 33, 44, 55 m/s). The structures are designed to withstand wind forces in compliance with IS 875 (Part 3): 2015. Unless the structures have large openings, all the wind forces are applied to the exterior surface of the building. In static analysis, the openings are taken into consideration for analysis. In general, static effects of wind are sufficient in the low-rise buildings. In tall building, dynamic and aerodynamic effects along with the static effects are required to be analyzed. The dynamic analysis using gust factor method is used. Furthermore, it has been observed that the building can be designed up to a height of 20–25 m based on static analysis for terrain category IV, beyond this height, the structure should be designed considering dynamic analysis. It is noteworthy that the lateral forces from dynamic analysis are significantly higher than those obtained from static analysis. Additionally, it has been noted that the wind pressure is influenced by the base dimension. The wind pressure exerts a greater effect along the shorter direction compared to the longer base dimension. When considering wind dynamic effects, the base dimension takes on greater significance.