This standard provides guidelines for designing and constructing new reinforced concrete buildings to be resistant to cyclones. It covers wind load estimation, structural planning and configuration, and specific detailing for critical components like roofs, openings, and foundations to ensure structural integrity under high-velocity winds and storm surges.
Provides guidelines for the cyclone resistant design and construction of buildings utilizing reinforced concrete.
Quick Reference Values
Minimum Grade of ConcreteM25 for RCC work (Clause 7.2.1)
Minimum Grade of SteelFe 415 or higher (Clause 7.2.2)
Maximum Roof Overhang500 mm (Clause 8.1.1)
Minimum Column Size250 mm x 250 mm (Table A.1)
Minimum Slab Thickness125 mm (Table A.1)
Minimum Parapet Wall Height600 mm for flat roofs (Clause 8.3)
Key Formulas
Vz = Vb * k1 * k2 * k3 * k4 — Design wind speed at height z (Clause 5.1, refers to IS 875 Part 3)
Pz = 0.6 * Vz^2 — Design wind pressure at height z (Clause 5.1, refers to IS 875 Part 3)
Practical Notes
Hip roofs are recommended over gable roofs for better aerodynamic performance (Clause 8.1.1).
Pay special attention to anchorage of roof framing to walls and walls to foundation to prevent uplift failure.
Strong fixing of door and window frames to the structure is critical as they are common failure points during cyclones.