Recommendations for dimensional parameters for industrial building

IS 8640: Scope & Key Specifications for Industrial Building Roof Work

Scope Summary (Clause 8.1)

• Roof Standardization is easier compared to other building components.
• Latitude-based Roof Types:
  • Above 23.2° latitude: Use saw-tooth north light roofs or variants (folded-plate, shell roofs) with clear glazing.
  • Below 23.2° latitude: Use monitor, pitched, or saw-tooth roofs with diffusive glazing.
• Standardization of Roof Components (truss girder, roof girder, main truss, inter-truss) based on recommended spans and load conditions facilitates prefabrication (steel or concrete).

Key Dimensional Parameters (Typical Factory Building Crane Clearances)

• Clearance between end carriage and roof leg
• Clearance from underside of roof
• Crane rail level from floor level
• Position of crane rail
• Location of end carriage of crane
• Column crane shaft location
• Span or width of bay

Referenced IS Codes for Structural Sections & Practices

• Steel sections: IS 808, IS 811, IS 1252, IS 1730 (plates, sheets, strips)
• Steel construction & crane codes: IS 800, IS 807, IS 3177, IS 4137
• Fabrication tolerances: IS 7215
• Safety & erection: IS 7205

Rounding Off (IS 2-1960)

• Final values must be rounded off to the same significant places as specified.

Summary Table: Roof Type Selection by Latitude

flowchart LR
    A[Latitude > 23.2°] --> B[Saw-tooth North Light Roof]
    A --> C[Folded-plate / Shell Roof]
    B & C --> D[Use Clear Glazing]
    E[Latitude ≤ 23.2°] --> F[Monitor Roof

IS 8640 - Clause 8.1: General Considerations for Roof Work

Key Points:

• Roof Type Selection by Latitude:

  • Latitudes > 23°2′: Use saw-tooth north light roofs or variants (folded-plate, shell roofs) with clear glazing.
  • Latitudes ≤ 23°2′: Use monitor, pitched, or saw-tooth roofs with diffusive glazing.

• Standardization of Roof Components:

  • Truss girders, roof girders, main trusses, and inter-trusses should be standardized based on span and loading.
  • Facilitates prefabrication (steel or concrete) improving economy and construction efficiency.

Crane Clearance Parameters (Typical Factory Building):

Recommendations for Standardization:

• Use recommended dimensional parameters for spans and loading conditions (refer IS 8640 tables).
• Standardize components to ease fabrication, erection, and maintenance.

Summary Table for Roof Type Selection by Latitude

flowchart LR
    A[Latitude > 23°2′] --> B[Saw-tooth North Light Roof]
    A --> C[Folded-Plate or Shell Roof]
    B --> D[Clear Glazing]
    C --> D
    E[Latitude ≤ 23°2′] --> F[Monitor or Pitched Roof]
    E --> G[Saw-tooth Roof]
    F --> H[Diffusive Glazing]
    G

IS 8640: Planning and Layout of Industrial Buildings - Key Points

1. Layout Considerations (Clause 3.1)

• Layout depends on functional requirements and local conditions.
• Bays oriented East-West or North-South favor northlight roof structures for natural lighting.
• Plan for future extensions and increased crane capacity.
• Refer to Fig. 1 & 2 for typical bay directions and roof plans.

2. Typical Bay Dimensions & Elements (from Figures)

3. Important Specifications

• Column spacing typically varies between 4 m to 8 m based on crane and functional needs.
• Bays should be aligned with crane direction for operational efficiency.
• Use northlight glazing on roof slopes facing north for optimal daylight.

Summary Diagram (Bay Orientation & Roof Layout)

flowchart LR
    A[Column/Crane Shaft] --> B[Inter-truss]
    B --> C[North Light Glazing]
    subgraph Bay Direction
        direction LR
        A --> B --> C
    end
    style A fill:#f9f,stroke:#333,stroke-width:2px
    style B fill:#bbf,stroke:#333,stroke-width:2px
    style C fill:#afa,stroke:#333,stroke-width:2px

Note: For detailed dimensional parameters and classifications, refer to the full IS 8640 standard or related industrial building codes.

IS 8640: Classification of Industrial Buildings & Dimensional Parameters

1. Classification (Clause 4)

Industrial buildings are classified based on:

• Function & Process
• Structural system
• Material handling requirements
• Crane capacity and layout

2. Key Dimensional Parameters (Clause 3.1 & Figures 1 & 2)

• Bay Span/Width: Typical bay spans vary depending on crane and process requirements.
• Direction of Bays:
  • Bays arranged North-South or East-West.
  • Northlight roofs recommended for better natural lighting.
• Column Spacing:
  • Determined by crane shaft positions and inter-truss distances.
  • Typical spacing shown in Figures 1 & 2 (e.g., 4-5 m for column spacing, 8 m for inter-trusses).

3. Planning Considerations

• Allow for future extensions.
• Consider crane capacity increase.
• Optimize layout for material flow and lighting.

Typical Parameters Summary

flowchart TD
    A[Industrial Building Layout] --> B[Bay Direction]
    B --> B1[North-South]
    B --> B2[East-West]
    A --> C[Bay Span & Column Spacing]
    C --> C1[Crane Shaft Position]
    C --> C2[Inter-truss Distance]
    A --> D[Roof Type]
    D --> D1[Northlight Roof]

For detailed design, refer to IS 8640 for exact dimensional tables and crane load considerations.

IS 8640: Dimensional Parameters - Column Spacing and Bay Width

Key Specifications from IS 8640

Notes:

• Groups A & B: Larger spans for heavy industrial use or cranes.
• Groups C, D, E, F: Smaller spans; utility/process industries, small scale industries, no crane usage.
• Inter-truss spacing typically 3 m for roofing in Groups C-F (Clause 5.4).
• Column spacing should consider actual building function and roofing type.

Summary:

• Bay Width (Span) is standardized but flexible within limits.
• Column Spacing depends on group classification and roof system.

flowchart LR
    A[Industrial Group] --> B{Group Type}
    B -->|A| C[Bay Width: 18-42 m]
    B -->|B| D[Bay Width: 12-30 m]
    B -->|C| E[Bay Width: 6-12 m]
    B -->|D,E,F| E
    E --> F[Column Spacing: As per requirement]
    F --> G[Inter-truss spacing: 3 m]

Use these parameters as a guideline, adjusting for actual structural and architectural needs.

IS 8640: Crane Clearances and Related Dimensions

Key Clearances (Clauses 4.2, 6.2, 7.0, 7.1)

• Side clearance: Refer to Fig. 3 in IS 8640 (typically 0.5 m or as per crane manufacturer).
• For special industries (iron & steel), follow actual crane manufacturing practice.

Recommendations:

• Heights and clearances should be modular (0.5 m steps).
• Adjust clearances based on specific industrial requirements.

flowchart LR
    A[Crane Capacity] --> B{Capacity ≤ 50t?}
    B -- Yes --> C[Top Clearance = 3.0 m]
    B -- No --> D{Capacity > 120t?}
    D -- Yes --> E[Top Clearance = 4.2 m]
    D -- No --> F[Use intermediate clearance values]
    C & E & F --> G[Side Clearance per Fig.3]
    G --> H[Adjust for special industries]

Use these clearances to ensure safe crane operation and building design compliance.

IS 8640: Roof Work Standardization – Key Points & Specifications

1. Roof Type Selection (Clause 8.1a)

• Latitude > 23°: Adopt saw-tooth north light roofs or variants (folded-plate, shell roofs) with clear glazing for natural lighting.
• Latitude ≤ 23°: Use monitor, pitched, or saw-tooth roofs with diffusive glazing for adequate daylight.

2. Standardization of Roof Components (Clause 8.1b)

• Standardize truss girders, main trusses, inter-trusses for specific spans and loading.
• Enables prefabrication in steel or concrete based on economy and constraints.

3. Crane Clearance Dimensions (Fig. 3 Summary)

4. Reference Standards for Structural Sections & Practices

• Rolled steel sections: IS 808 (Part I)-1973
• Cold-formed steel sections: IS 811-1964
• Steel fabrication tolerances: IS 1852-1973
• Overhead crane design: IS 3177-1977
• Structural steel use: IS 800-1962

Summary Diagram: Roof Type Selection by Latitude

flowchart TD
    A[Latitude] -->|> 23°| B[Saw-tooth North Light Roof]
    A -->|≤ 23°| C[Monitor / Pitched / Saw-tooth with Diffusive Glazing]

Note: For detailed dimensional parameters and load considerations, refer to IS 8640 full text and associated IS codes listed above.

Special Considerations for Utility and Process Industries (IS 8640)

Key Points (Clause 4.6 & 4.6.1)

• Applies to industries like thermal power stations, fertilizer units, petrochemical units, textile mills, etc.
• Structures may or may not have cranes; if cranes exist, often only for maintenance.
• Loads to consider:
  • Dead loads
  • Live/superimposed loads (specific to process)
  • Wind and seismic forces
  • Temperature-induced stresses (due to process heat)
  • Airborne vibrations
  • Special height requirements

Roof Work Standardization (Clause 8.1)

• Roof types depend on latitude:

  • 23.2° latitude: Saw-tooth north light, folded-plate, shell roofs with clear glazing.

  • < 23.2° latitude: Monitor, pitched, or saw-tooth with diffusive glazing.
• Standardize truss components for span and load for ease of prefabrication.

Crane Clearance (Typical Factory Building)

• Maintain clearances between crane end carriage and roof leg.
• Crane rail level from floor and column shaft must be specified.
• Refer to Fig. 3 in IS 8640 for crane clearance diagram.

Load Combination Formula (Generalized for Process Industries)

[ \text{Design Load} = D + L + W + S + T + V ] Where:

• (D) = Dead load
• (L) = Live load (including process equipment)
• (W) = Wind load
• (S) = Seismic load
• (T) = Temperature stresses
• (V) = Vibration effects

Reference IS Codes for Structural Steel Sections & Cranes

• IS 808 (Beams & Channels)
• IS 807 (Cranes & Hoists design)
• IS 3177 (Overhead travelling cranes)
• IS 7205 (Safety in erection)
• IS 6533 (Steel chimneys)
• IS 4000 (Structural joints with HT bolts)

flowchart TD
    A[Process Industry Structure] --> B{Loads to Consider}
    B --> D[Dead Loads]
    B --> L[Live Loads]
    B --> W[Wind Loads]
    B --> S[Seismic Loads]
    B --> T[Temperature

IS 8640: Loading Conditions & Safety Requirements Summary

Loading Conditions (Clauses 4.1 & 4.2)

• Refer IS 807-1976 for detailed loading cycles classification.
• Group A buildings:
  • Members may experience 500,000 to 2 million cycles of Loading Condition 3.
  • Or 2 million+ cycles of Loading Condition 4 during a 50-year life span.
• Loading condition choice depends on service and usage.

Roof Work Standardization (Clause 8.1)

• Latitude > 23.2°: Use saw-tooth north light roofs, folded-plate, shell type with clear glazing.
• Latitude < 23.2°: Use monitor or pitched roofs with diffusive glazing.
• Standardize truss girder, main truss, inter-truss spans based on loading for ease of prefabrication.

Crane Clearance (Fig. 3)

• Maintain clearances between:
  • End carriage & roof leg underside
  • Crane rail level & floor level
  • End carriage & column crane shaft
  • Span or width of bay
• Ensures maintenance without crane-level access.

Safety Requirements

• Design for minimum safety factors as per IS 807 and related codes.
• Consider fatigue life based on cycle counts and loading severity.
• Standardize components for predictable performance and ease of maintenance.

Reference Table: Loading Cycles Classification (Simplified)

flowchart LR
    A[Industrial Building] --> B[Determine Loading Condition]
    B --> C{Cycle Count}
    C -->|500k-2M| D[Loading Condition 3]
    C -->|>2M| E[Loading Condition 4]
    D --> F[Design members accordingly]
    E --> F
    F --> G[Standardize roof & crane components]
    G --> H[Apply safety factors & clearances]

For detailed structural design, always cross-reference **IS 807-

IS 8640 Recommendations for Prefabrication and Material Use (Summary)

Key Recommendations (Clause 8.1):

• Roof Work Standardization:

  • For latitudes > 23°2′, use saw-tooth north light roofs or variants (folded-plate, shell type) with clear glazing.
  • For latitudes < 23°2′, use monitor, pitched, or saw-tooth roofs with diffusive glazing.

• Prefabrication:

  • Standardize roof components (truss girder, roof girder, main truss, inter-truss) based on recommended spans and loading.
  • Prefabrication possible in concrete or steel, depending on economy and constraints.

Material & Section References:

• Use standard steel sections per IS codes:
  • IS 808 (hot rolled steel beams)
  • IS 811 (cold formed light gauge steel)
  • IS 1730 (steel plates and sheets)
• Follow fabrication tolerances as per IS 7215.
• Use high tensile friction grip bolts (IS 4000) for joints.
• Refer to IS 7205 for safety during erection.

Typical Crane Clearance (Fig. 3 parameters):

Summary Diagram: Prefabrication Flow

flowchart LR
    A[Standardized Roof Spans] --> B[Select Material: Steel/Concrete]
    B --> C[Design Components (Truss, Girders)]
    C --> D[Prefabrication in Factory]
    D --> E[Transport to Site]
    E --> F[Erection & Assembly]

Note: For detailed dimensional parameters, loading, and material specs, consult IS 8640 full text and referenced IS codes.