Methods of test for strength and stability of chairs and stools, Part 2: Determination of stability of chairs and stools

IS 5533: Scope & Key Specifications

• Scope (Clause 1.1):
  Specifies minimum dimensions for spaces required for various human activities, ensuring comfort and functionality.

• Minimum Dimensions (Clause 2.1 & Appendix A):
  Dimensions are given in millimetres for activities such as:

  • Bathing (Squatting, Infant)
  • Dressing (Putting on sari, coat)
  • Cooking & Lighting (Stove, Angithi, Chullah)
  • Serving and Eating
  • Sleeping (Child, Adult, Infant in cradle)
  • Casual activities (Barber attending, cleaning bicycle)

• Rounding Off (Clause 0.5):
  Values must be rounded as per IS 2:1960 rules, maintaining the number of significant digits.

Example Table Extract (Dimensions in mm)

Summary Diagram of Space Planning

graph TD
    A[Human Activity] --> B[Bathing]
    A --> C[Dressing]
    A --> D[Cooking & Lighting]
    A --> E[Serving & Eating]
    A --> F[Sleeping]
    A --> G[Casual Activities]
    
    B --> B1[Squatting Bath]
    B --> B2[Infant Bath]
    C --> C1[Putting on Sari]
    C --> C2[Putting on Coat]
    D --> D1[Lighting Stove]
    D --> D2[Lighting Angithi]

Note: Refer Appendix A of IS 5533 for detailed dimensional tables for each activity.

IS 5533: Recommendations for Dimensions of Spaces for Human Activities

Key Specifications:

• Minimum dimensions for various human activities are provided in Appendix A (Clause 2.1).
• All dimensions are in millimetres (mm).
• Activities covered include:
  • Bathing (squatting, infant)
  • Dressing (putting on sari, coat, baby dressing)
  • Cooking and washing (utensils, clothes)
  • Lighting (angithi, chullah, stove)
  • Serving and eating
  • Sleeping clearances
  • Casual and common activities (cleaning bicycle, barber attending, reading, playing)

Important Notes:

• Dimensions are guiding and limiting, ensuring ergonomic comfort and functionality.
• Values must be rounded off per IS 2-1960 rounding rules to maintain precision.

Example Table Extract (Dimensions in mm):

Summary Diagram of Space Planning for Human Activities:

graph TD
    A[Human Activities] --> B[Bathing]
    A --> C[Dressing]
    A --> D[Cooking & Washing]
    A --> E[Lighting]
    A --> F[Sleeping]
    A --> G[Casual Activities]

    B --> B1[Squatting Bath]
    B --> B2[Infant Bath]
    C --> C1[Putting on Sari]
    C --> C2[Putting on Coat]
    D --> D1[Washing Utensils]
    D --> D2[Washing Clothes]
    E --> E1[Lighting Angithi]
    E --> E2[Lighting Stove]
    F --> F1[Child & Adult]
    F --> F2[Infant in Cradle]

For detailed dimensions, refer to Appendix A of IS 5533, which provides comprehensive tables for each activity.

IS 5533 - Terminology & Minimum Space Dimensions Summary

• Scope (Clause 1.1): Specifies minimum dimensions for spaces related to various human activities.

• Rounding Off (Clause 0.5): Final values must be rounded per IS 2-1960 rules, maintaining the same number of significant digits as specified.

• Appendix A (Clause 2.1): Provides detailed minimum space dimensions (in mm) for activities such as:

  • Bathing (Squatting, Infant)
  • Dressing (Baby, Putting on sari/coat)
  • Washing clothes/utensils/hands
  • Lighting (Angithi, Chullah, Stove)
  • Cooking (Service, Assisted)
  • Serving and Eating
  • Sleeping (Child, Adult, Infant in cradle)
  • Casual and common activities (e.g., cleaning bicycle, barber attending)

Example Dimensions (mm):

Key Notes:

• Dimensions cover reach extents, clearances, and limiting dimensions.
• Values ensure ergonomic comfort and functional efficiency.
• Dimensions are guiding and based on Indian context with international coordination.

flowchart TD
    A[Human Activities] --> B[Bathing]
    A --> C[Dressing]
    A --> D[Cooking]
    A --> E[Lighting]
    A --> F[Sleeping]
    B --> B1[Squatting Bath]
    B --> B2[Infant Bath]
    C --> C1[Putting on Sari]
    C --> C2[Putting on Coat]
    D --> D1[Cooking Service]
    D --> D2[Assisted Cooking]

For detailed tables, refer to Appendix A of IS 5533.

IS 5533: Test Equipment and Setup - Key Points

• Rounding Off Values:
  Final test or analysis results must be rounded per IS 2:1960 rules, retaining the same number of significant digits as the specified values.

• Minimum Space Dimensions:
  Appendix A provides minimum dimensions (in mm) for spaces related to various human activities such as dressing, bathing, cooking, lighting, sleeping, and casual activities. These ensure ergonomic and functional adequacy during testing or setup.

Example Dimensions from Appendix A (mm):

Important Notes:

• Use these dimensions to design test setups that simulate real human activity spaces.
• Ensure test equipment placement respects these clearances for accurate and practical evaluations.
• Follow IS 2:1960 for rounding to maintain consistency in reporting.

flowchart LR
    A[Test Requirement] --> B[Test Setup]
    B --> C{Check Space Dimensions}
    C -->|Complies| D[Conduct Test]
    C -->|Non-Complies| E[Adjust Setup]
    E --> B
    D --> F[Round Off Results per IS 2:1960]
    F --> G[Report Results]

This ensures compliance and reliability of test outcomes per IS 5533.

IS 5533: Preparation of Test Specimen – Key Points

The provided context mainly covers rounding off rules and minimum space dimensions for human activities (Appendix A), but lacks direct formulas or specimen preparation details. Based on standard practice in IS codes and structural testing:

Key Specifications for Test Specimen Preparation:

• Specimen dimensions should be as per the relevant test method or appendix (if specified).
• Rounding off results must follow IS 2:1960:
  • Final test values rounded to the same decimal places as specified.
• Specimen conditioning: Usually specimens are conditioned to standard temperature and humidity before testing.
• Number of specimens: Typically, a minimum of 3 specimens for repeatability.
• Marking and identification: Each specimen must be clearly marked for traceability.

Example: Rounding Off (IS 2:1960)

Appendix A (Clause 2.1) – Minimum Space Dimensions (mm)

• Dressing: ~560-610 mm width
• Infant bathing: ~760-1410 mm length
• Cooking service: ~870 mm clearance
• Playing cards: ~560 mm width

flowchart LR
    A[Specimen Preparation] --> B[Dimensioning as per IS]
    B --> C[Conditioning (Temp & Humidity)]
    C --> D[Marking & Identification]
    D --> E[Testing]
    E --> F[Rounding off results (IS 2:1960)]

For detailed specimen size and preparation, refer to the specific test method or related IS standards linked to the material or activity under test.

IS 5533 (1969) primarily focuses on human activity space dimensions; it does not explicitly detail the "Test Procedure for Stability." However, general test procedures for stability in structural or equipment standards typically include:

Key Aspects for Stability Test Procedure (General Practice)

• Test Setup: Place the specimen on a flat, level surface.
• Load Application: Apply static or dynamic loads as per design or code requirements.
• Measurement: Observe displacement, tipping angle, or overturning moment.
• Acceptance Criteria: No permanent deformation or failure; stability maintained under specified load.

Rounding Off Results (IS 2:1960)

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

For Stability Calculations (General Formula)

[ \text{Factor of Safety (FOS)} = \frac{\text{Resisting Moment}}{\text{Overturning Moment}} \geq 1.5 \text{ (typical)} ]

Tips:

• Refer to IS 456 for reinforced concrete stability.
• Use Appendix A of IS 5533 for minimum space dimensions to ensure ergonomic stability in human-related designs.

flowchart TD
    A[Test Setup] --> B[Load Application]
    B --> C[Measurement of Displacement/Angle]
    C --> D[Evaluate Factor of Safety]
    D --> E{FOS >= 1.5?}
    E -- Yes --> F[Pass Stability Test]
    E -- No --> G[Fail Stability Test]

For detailed stability test procedures, consult relevant IS codes specific to the structure or equipment type.

IS 5533: Load Application and Measurement - Key Points

IS 5533 primarily provides minimum space dimensions for various human activities (Appendix A), not direct load application formulas. However, for structural design involving human loads, the following applies:

Load Application (Human Activities)

• Use minimum space dimensions from Appendix A to estimate occupancy and activity zones.
• Typical human load values for design:
  • Standing load: 250 kg/m² (approx. 2.5 kN/m²)
  • Seated load: 150 kg/m² (approx. 1.5 kN/m²)
• Apply loads uniformly over the calculated area based on activity space.

Measurement and Rounding (Clause 0.5)

• Final test or calculated values must be rounded off as per IS 2:1960.
• Retain the same number of significant digits as specified in the standard.

Summary Table: Typical Human Load Values for Structural Design

Conceptual Diagram: Load Application Zones

flowchart TD
    A[Human Activity] --> B[Measure Space Dimensions (IS 5533 Appendix A)]
    B --> C[Calculate Area]
    C --> D[Apply Load Intensity (kN/m²)]
    D --> E[Calculate Total Load on Structure]
    E --> F[Structural Analysis and Design]

Note: For detailed load factors, refer to IS 875 (Part 3) for live loads due to occupancy. IS 5533 guides space planning to estimate these loads effectively.

IS 5533: Evaluation Criteria Summary

• Purpose: Specifies minimum space dimensions for various human activities (Clause 1.1).
• Dimension Units: All dimensions in millimetres (Appendix A).
• Rounding Off: Values must be rounded per IS 2-1960 rules, maintaining the same number of significant figures as specified (Clause 0.5).

Key Points from Appendix A (Minimum Dimensions for Activities)

Evaluation Criteria:

• Check compliance by comparing observed/calculated values with specified minimum dimensions.
• Round off per IS 2-1960 before comparison.
• Use Appendix A tables for specific activity space requirements.

Rounding Off (IS 2-1960) Summary:

• If the digit to be dropped is <5, round down.
• If the digit is >5 or 5 followed by non-zero digits, round up.
• If exactly 5 followed by zeros, round to the nearest even number.

flowchart TD
    A[Measure Space Dimension] --> B[Round Off per IS 2-1960]
    B --> C{Is Rounded Value ≥ Minimum Dimension?}
    C -- Yes --> D[Complies with IS 5533]
    C -- No --> E[Does Not Comply]

For detailed dimensions, refer to Appendix A of IS 5533.

IS 5533: Recording and Reporting Results - Key Points

• Rounding Off Results (Clause 0.5):
  Final test/analysis values must be rounded per IS 2:1960 rules.

  • Retain the same number of significant figures as the specified standard value.
  • Ensures consistency and comparability of reported data.

• Reporting Format:

  • Express results clearly, indicating units and test conditions.
  • Use consistent decimal places matching the precision of the standard.

• Appendix A (Clause 2.1):
  Provides minimum dimensions (in mm) for spaces related to human activities (e.g., bathing, dressing, cooking).

  • Use these dimensions as benchmarks when recording spatial measurements.
  • Examples:
    • Dressing space width: ~560-610 mm
    • Infant bathing space: ~760-1410 mm
    • Lighting stove clearance: specified in mm

Rounding Off Example (IS 2:1960)

Summary Diagram: Reporting Workflow

flowchart TD
    A[Test/Analysis Result] --> B[Rounding per IS 2:1960]
    B --> C[Match significant figures]
    C --> D[Record value with units]
    D --> E[Report with reference to IS 5533]

Tip: Always cross-check reported values against the specified standard precision to maintain compliance and clarity.

Rounding Off Test Values as per IS 5533

• Clause Reference: No specific clause number, but IS 5533 refers to IS 2-1960 for rounding off rules.
• Key Rule: Final test or calculated values must be rounded off according to IS 2-1960.
• Significant Figures: The number of significant digits retained in the rounded value should match the number of significant digits in the specified standard value.

IS 2-1960 Rounding Rules Summary:

Example:

• Specified value: 12.3 (3 significant digits)
• Test value: 12.345
• Rounded value: 12.3 (rounded to 3 significant digits)

Additional Notes:

• IS 5533 focuses on minimum dimensions for human activities (Appendix A).
• All dimensions are in millimeters.
• Rounding ensures uniformity and compliance in reporting test results.

flowchart LR
    A[Test/Calculated Value] --> B{Check digits after specified precision}
    B -- <5 --> C[Round Down]
    B -- ≥5 --> D[Round Up]
    C & D --> E[Final Rounded Value with same significant digits as specified]

Summary: Always round test results per IS 2-1960, matching the precision of the standard's specified values for compliance.

IS 5533 - Safety Precautions: Minimum Space Dimensions for Human Activities

Key Points from Clause 2.1 & Appendix A:

• Specifies minimum clearances and dimensions (in mm) for various activities to ensure safety and comfort.
• Covers activities like:
  • Dressing (e.g., putting on sari, coat)
  • Bathing (adult, infant)
  • Cooking and lighting (stove, angithi, chullah)
  • Serving and eating
  • Sleeping clearances (doctor attending, approaching bed)
  • Common and casual activities (cleaning bicycle, barber attending)

Example Dimensions (mm):

Safety Precautions Summary:

• Ensure adequate clearance for movement and emergency access.
• Follow minimum space requirements to avoid cramped conditions.
• Use Appendix A tables as a reference for designing safe and ergonomic spaces.
• Round off dimensions per IS 2-1960 rules for compliance.

flowchart TD
    A[Human Activity] --> B{Type of Activity}
    B --> C[Dressing]
    B --> D[Bathing]
    B --> E[Cooking]
    B --> F[Sleeping]
    C --> G[Min Space Dimensions]
    D --> G
    E --> G
    F --> G
    G --> H[Safety & Comfort Ensured]

Use IS 5533 Appendix A tables as a design checklist to maintain safety and comfort in human activity spaces.

IS 5533: Notes on International Coordination & Space Dimensions

• The standard aligns with international practices while addressing local requirements (Clause 0.4).
• It provides minimum space dimensions for various human activities in Appendix A (Clause 2.1).
• Dimensions are in millimetres and cover activities like:
  • Dressing, bathing, infant care
  • Cooking, lighting (angithi, chullah)
  • Serving & eating, playing, sleeping, casual activities
• Examples of space dimensions (approximate):
  • Dressing space: 560–760 mm width
  • Infant bathing: 760–1410 mm length
  • Cooking service clearance: 870 mm
• The standard ensures ergonomic and functional space for comfort, safety, and efficiency.
• It also follows rounding-off rules for numerical values (Clause 1.1).

Summary Table (Sample from Appendix A)

flowchart TD
    A[Human Activities] --> B[Minimum Space Dimensions]
    B --> C[Dressing]
    B --> D[Infant Care]
    B --> E[Cooking]
    B --> F[Lighting]
    B --> G[Serving & Eating]

Use IS 5533 Appendix A for detailed dimension tables to ensure ergonomic design in furniture and space planning.

IS 5533 Annexures Summary: Minimum Dimensions for Human Activities (Appendix A)

• Scope: Specifies minimum space dimensions (in mm) for various human activities to ensure comfort and functionality.
• Key Activity Groups & Dimensions:

• Guiding Principles:
  • Dimensions ensure ergonomic comfort and ease of movement.
  • Values are given as minimum clearances.
  • Rounded off for practical implementation.

Usage: Refer to Appendix A for detailed dimensional tables per activity.

Visualization: Example Space Dimension for Dressing Area

graph LR
    A[Minimum Dressing Space] --> B[Width: 560 - 760 mm]
    A --> C[Length: 760 - 1410 mm]
    A --> D[Clearance for movement]

For detailed tables, consult Appendix A of IS 5533, which provides comprehensive dimensions for each activity type.