In this Excel sheet, wind load calculations are presented for the IBN SINA Pharmaceutical project under Exposure Category A as per the Bangladesh National Building Code (BNBC). The sheet accepts wind speed, building geometry, and pressure coefficients to calculate wind pressures on structural elements in accordance with BNBC requirements.
About the Bangladesh National Building Code (BNBC) Wind Provisions
The BNBC governs structural design in Bangladesh and provides wind load provisions based on the country’s geographic wind speed zonation. Bangladesh is situated in a region subject to tropical cyclones and severe monsoon winds, particularly in coastal and southern zones. The BNBC classifies the country into wind speed zones and defines terrain categories (A through D) that reflect surface roughness.
Exposure Category A in BNBC corresponds to large city centres with closely spaced tall buildings — terrain where the atmospheric boundary layer is thick and wind speeds near the ground are substantially reduced.
Project Context: IBN SINA Pharmaceutical
This sheet was prepared for an actual industrial/pharmaceutical building project, making it a practical real-world example of BNBC wind load calculation. Pharmaceutical facilities often require special attention to structural integrity and building envelope performance, as production environments demand airtight enclosures and pressure-controlled spaces.
Sheet Content
- Basic wind speed input per BNBC wind zone map
- Terrain category and height multiplier factors for Exposure A
- Gust factor and design wind pressure on each surface
- Lateral wind force calculation for structural frame design
- Summary table suitable for inclusion in a structural design report
Download the sheet to see a complete worked example of BNBC wind load calculation for an industrial building under Exposure Category A.
Download the BNBC Wind Load Calculation Sheet
This sheet provides a complete worked example of wind load calculation under the Bangladesh National Building Code (BNBC) for an industrial facility under Exposure Category A. It is a valuable reference for engineers working on BNBC-governed projects in Bangladesh and neighbouring countries that adopt similar code provisions. Download the free Excel sheet below.
