IS 154992004AI Search Enabled✦ AI Generated

Guidelines for Survey of Housing and Building Typology in Cyclone Prone Areas for Assessment of Vulnerability of Regions and Post Cyclone Damage Estimation
2004 Edition

IS 15499:2004 outlines detailed procedures for conducting surveys of housing and building types in cyclone-vulnerable zones across India. It supports the evaluation of regional susceptibility and assists in estimating damage after cyclones by gathering comprehensive information on structural configurations, materials, and damage levels. This code is an essential tool for engineers, urban planners, and disaster response teams aiming to assess structural resilience and develop retrofit strategies to improve cyclone resistance.

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2004Edition
Cyclone Resistant StructureCategory
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Overview

What This Standard Covers

IS 15499:2004 outlines detailed procedures for conducting surveys of housing and building types in cyclone-vulnerable zones across India. It supports the evaluation of regional susceptibility and assists in estimating damage after cyclones by gathering comprehensive information on structural configurations, materials, and damage levels. This code is an essential tool for engineers, urban planners, and disaster response teams aiming to assess structural resilience and develop retrofit strategies to improve cyclone resistance.

Audience

Who Uses This Standard

  • Structural and Civil Engineering Professionals
  • Disaster Risk Management Experts
  • Urban Development Planners
  • Government Survey Personnel
  • Construction Quality Inspectors
  • Academicians and Researchers in Disaster Mitigation

Contents

Key Topics Covered

✓Evaluation of cyclone vulnerability
✓Classification of building typologies
✓Analysis of structural frameworks
✓Damage rating criteria for walls, roofs, foundations, and columns
✓Survey forms and data collection methods
✓Post-cyclone damage quantification
✓Guidelines for cyclone-resistant retrofitting
✓Materials and construction practices in cyclone-prone regions
✓Surveyor qualifications and survey methodology
✓Regional disaster preparedness and infrastructure access
✓Community infrastructure assessment
✓Data aggregation for cyclone impact studies

Structure

Table of Contents

1Scope and Key Features▼

IS 15499 provides a framework and standardized forms for examining the vulnerability of buildings and determining retrofitting requirements for cyclone resistance. It covers:

  • Detailed typology and structural evaluation through prescribed proformae.
  • Collection of quantitative data on dimensions, structural components, and material properties.
  • Application of damage grading and rounding as per IS 2:1960.

Key data tables include parameters such as duration of water presence, occupant numbers, plot area, building classification, roof and foundation types, and wall materials. Structural measurements cover lengths, heights, thicknesses, member sizes, foundation depth, roof characteristics, and connection details. Rounding rules ensure consistent data handling. This standard facilitates pre-cyclone assessment, post-cyclone damage analysis, and planning for cost-efficient retrofits.

2Fundamental Survey Principles▼

This section specifies essential guidelines for conducting surveys:

  • Surveyor Qualifications: Minimum educational levels specified per proforma, ranging from graduation to diploma with experience.
  • Data Collection: Proformae include multiple-choice coded questions and quantitative field measurements.
  • Damage Assessment: Four-tier damage scale categorizing marginal, medium, heavy damage, and failure based on column conditions.
  • General Survey Data: Proforma I captures geographic, demographic, hazard exposure, infrastructure, communication, and typology data using numeric codes.

A structured flowchart illustrates the survey process from qualification verification through data collection and damage evaluation to report compilation.

3Instructions for Completing Survey Forms▼

Guidelines focus on accurate and consistent data entry:

  • Objective: To identify area readiness, building types, structural vulnerabilities, and damage extent for cyclone resilience and retrofit planning.
  • Proforma Usage:
    • I: Area preparedness and accessibility (unit-wise).
    • IIA: Building typology characterization (standalone or with IIB).
    • IIB: Structural system details per building.
    • IIC: Post-cyclone damage survey with IIB.
  • Data Entry: Mark choices for multiple-choice questions; provide exact site measurements for quantitative fields.
  • Structural data includes member dimensions, spacing, materials, and system classification.
  • Damage is quantified using standard scales.

A flowchart summarizes the selection and completion of proformae during surveys.

4Damage Classification Scales▼

Defines damage categories for various structural elements:

  • Walls: Ranging from minor cracking and surface degradation to complete failure.
  • Roofs (Non and Semi-engineered): From minor looseness to total structural failure.
  • Columns (Industrial Sheds): Describes damage from slight corrosion and cracking to full structural collapse.
  • Roofs (Industrial Metal Sheets): Damage ranges from minor bolt disturbances to truss failures.

Overall column damage is classified by percentage of columns affected and severity. The damage scales guide post-cyclone assessment, repair prioritization, and data recording using coded forms.

Annex ASurvey Proformae Details▼

Specifies surveyor qualifications and proformae application:

  • Surveyor Education: Graduates or diploma holders with experience based on proforma type.
  • Proformae Purposes:
    • I: Preparedness and accessibility.
    • IIA: Typology statistics.
    • IIB: Structural and connection details.
    • IIC: Post-cyclone damage evaluation.
  • Filling Instructions: Select coded options or input precise measurements.

A diagram shows the assignment of proformae based on surveyor qualification, linking data collection to retrofit design and disaster analysis.

Annex BCommittee Composition▼

Details the makeup of the development committee:

  • Known as the Cyclone Resistant Structures Sectional Committee, CED 57.
  • Includes experts in structural engineering, cyclone-resistant construction, building typologies, and representatives from government and research organizations.
  • Specifies sample size limits for building categories surveyed.
  • References IS 15498:2004 for building classification definitions.

A schematic illustrates committee structure and member expertise areas.

Frequently Asked

Popular Questions About IS 15499

?Which building types and construction materials are addressed by IS 15499 for cyclone vulnerability surveys?▼

IS 15499 focuses on surveying residential and common local building types found in cyclone-prone Indian regions. It categorizes buildings by structural type and materials, including masonry (such as bricks and concrete blocks), timber, lightweight materials like corrugated sheets and thatch, and reinforced concrete systems. The objective is to evaluate vulnerability and facilitate damage estimation post-cyclone, concentrating primarily on typical housing rather than industrial or commercial structures.

?How does IS 15499 categorize damage severity for walls, roofs, foundations, and columns?▼

The standard uses distinct damage classifications based on severity and structural element:

  • Walls: From minor cracks and surface deterioration (marginal) to complete collapse (failure).
  • Roofs (non-engineered/semi-engineered): Damage ranges from slight loosening of connections to total roof failure.
  • Columns (industrial sheds): Levels span from minor bolt corrosion and small cracks to significant tilting or collapse.
  • Roofs (industrial metal sheets): Damage spans minor bolt disturbances to failure of trusses and sheet loss. These classifications assist in assessing structural condition and determining repair urgency.
?What are the proformae used for gathering building typology and structural data according to IS 15499?▼

IS 15499 employs a set of proformae for systematic data collection:

  • Proforma IIA collects statistical information on building types, dimensions, materials, and quality.
  • Proforma IIB records detailed structural system characteristics, member sizes, and connection types.
  • Proforma IIC is used for post-cyclone damage surveys to evaluate damage extent and infer wind speeds. Proforma IIA can be used independently or with IIB, while IIC is always paired with IIB, ensuring comprehensive data for vulnerability analysis and retrofit design.
?What qualifications are suggested for surveyors conducting assessments under IS 15499?▼

The standard recommends specific educational qualifications based on the proforma being completed:

  • Proforma I: Requires a graduate degree in any field.
  • Proforma IIA: Requires graduation or a diploma in civil engineering.
  • Proforma IIB: Requires a diploma in civil engineering.
  • Proforma IIC: Requires a diploma in civil engineering with at least three years of experience or a civil engineering degree. These qualifications ensure surveyors possess adequate technical expertise for accurate cyclone vulnerability and damage assessments.
?In what ways does the data collected through IS 15499 assist in planning cyclone-resistant retrofitting?▼

The comprehensive data gathered helps identify structural weaknesses, material deficiencies, and common failure patterns in cyclone-prone housing. By assessing area preparedness, building typologies, and damage extents, planners can prioritize retrofitting efforts. This enables the design of cost-effective reinforcement measures tailored to prevalent vulnerabilities, ultimately enhancing structural resilience and reducing damage from future cyclones.

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