IS 15499:2004 is the Indian Standard (BIS) for guidelines for survey of housing and building typology in cyclone prone areas for assessment of vulnerability of regions and post cyclone damage estimation. This standard provides guidelines for conducting surveys of housing and building typologies in cyclone-prone areas. It establishes a framework for assessing regional vulnerability before a cyclone and for estimating damage after a cyclone, facilitating standardized data collection and risk analysis.
Guidelines for Survey of Housing and Building Typology in Cyclone Prone Areas for Assessment of Vulnerability of Regions and Post Cyclone Damage Estimation
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Building Classification | Qualitative durability categories: Kutcha, Semi-Pucca, Pucca. | Based on occupancy and structural system: e.g., Residential Wood Frame (WSF1), Commercial Masonry (RM1). | HAZUS-MH Hurricane Model |
| Damage States | General descriptive categories (e.g., Minor, Moderate, Severe, Collapse) are suggested. | Five discrete Damage States (DS1 to DS5) with specific physical damage descriptions for each building type. | HAZUS-MH Hurricane Model |
| Roof Shape | Broad categories: Flat, Pitched, Thatched, Arched. | More specific geometric types: Flat, Gable, Hip, Mansard. | HAZUS-MH Hurricane Model |
| Wall Material Type | Locally-specific list including Grass/bamboo, Mud, Unburnt brick, Burnt brick, Stone, RC. | Generic engineering categories: Wood, Steel, Concrete (RC), Unreinforced Masonry (URM), Reinforced Masonry (RM). | GEM Building Taxonomy v3.0 |
| Vulnerability Assessment Method | Visual survey form to assign vulnerability scores based on building features (connections, openings, condition). | Assigning a Basic Structural Hazard (BSH) score based on typology, then applying Performance Modification Factors (PMFs). | FEMA P-154 |
| Number of Stories | Recorded as a numerical value (1, 2, 3, etc.) | Categorized into height ranges: Low-rise (1-3), Mid-rise (4-7), High-rise (8+). | HAZUS-MH Hurricane Model |