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 based on the project's BNBC wind zone
- Exposure Category A terrain classification and associated coefficients
- Velocity pressure and gust effect factor computation
- Design wind pressure on walls and roof of the pharmaceutical building
- Element-wise pressure summary for use in structural member design
Design Inputs Required
- Basic wind speed for the project's BNBC wind zone
- Exposure/terrain category (A through D)
- Building height and plan dimensions
- Structure importance category
- Gust effect factor
Applicable Design Codes
This sheet applies the wind load provisions of the Bangladesh National Building Code (BNBC). It is worked as a real project example using Exposure Category A, so users applying it to a different terrain category or wind zone should update the relevant coefficients before reuse.
Who Should Use This Tool
This tool is intended for engineers working on projects in Bangladesh who need to apply BNBC wind provisions, as well as engineers elsewhere who want a worked, real-project example of how a BNBC wind load calculation is structured from input parameters through to design pressures.
Download the Free BNBC Wind Load Calculation Sheet
This Excel sheet is available as a free download and is based on an actual pharmaceutical industrial building project designed under the Bangladesh National Building Code. It walks through wind speed, Exposure Category A terrain data, and building geometry to arrive at design wind pressures on walls and roof elements. Because it reflects a real project, it is a useful reference for engineers learning the BNBC wind load procedure, though inputs should be adjusted to match the wind zone and exposure category of any new project before reuse.
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