S. M. Tahmidur Rahman and Mahadi Hasan
Bangladesh frequently faces devastating tropical cyclones due to its geographical location. The Bangladesh National Building Code (BNBC) 2020 introduces specific wind exposure provisions to ensure structural safety and resilience against high winds. These provisions define critical design parameters, including wind speeds, topographic factors, and importance levels, based on geographical conditions. This study investigates the impact of BNBC 2020 wind exposure provisions on the construction costs of high-rise buildings. Using ETABS 2016, three 15-story dual-system RCC buildings were analyzed under varying wind exposure categories, with uniform earthquake provisions. Results revealed significant cost variations, with material requirements increasing by up to 22% in higher wind exposure categories. This research contributes valuable insights into the relationship between wind exposure provisions and construction costs, aiding stakeholders in optimizing structural designs and budgets for cyclone-prone regions like Bangladesh.
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