Aluminium I-beam
1985 Edition

Overview of IS 5384: Aluminium Beam Dimensions & Properties

Scope (Clauses 2.0 & 6.1): This code defines the dimensional details, sectional characteristics, and mass specifications for Indian Standard Aluminium Beams, considering aluminium density at 2.7 g/cm³.

Principal Parameters (Clause 3.1):

Sample Data (ALB 60x30-1.5):

IS 5384 - Terminology and Key Parameters for Aluminium Beams

Symbols and Their Meanings (Clause 3.1)

Notes:

• Mass per unit length is calculated based on aluminium density of 2.7 g/cm³ (Clause 2.7).
• Dimensions such as depth (h), flange width (b), web thickness (tw), flange thickness (ff), and root radius (r) are expressed in millimeters.
• Moments of inertia, section moduli, and torsion constant values are provided in cm⁴ or cm³.

Excerpts from Typical Section Properties (Table 1):

IS 5384 - Symbol Notations & Essential Parameters for Aluminium Beams

Clause 3.1 - Symbol Definitions:

Formulas:

• Radius of Gyration:

[ r_x = \sqrt{\frac{I_x}{a}}, \quad r_y = \sqrt{\frac{I_y}{a}} ]

• Section Modulus:

[ Z_x = \frac{I_x}{c_x}, \quad Z_y = \frac{I_y}{c_y} ]

where (c_x, c_y) represent distances from the neutral axis to the furthest fiber.

Selected Data from Table 1:

IS 5384: Aluminium Beam Designations & Core Properties

Summary of Aluminium Beam Designations (Clause 6.1)

Notes:

• Designations such as ALB 40x20-0.4 represent beam depth × flange width - mass per meter.
• All listed dimensions and properties are standardized to assist in design and selection.
• Aluminium alloys must comply with IS 733-1983 (Clause 5.1.1).

Example Section (ALB 60x30-1.5):

• Mass: 1.5 kg/m
• Cross-sectional area: 5.73 cm²
• Depth: 60 mm
• Flange width: 30 mm
• Web thickness: 4 mm
• Flange thickness: 6 mm
• Ix: 31.2 cm⁴, Iy: 2.7 cm⁴
• Section modulus Zx: 10.4 cm³

Fundamental Equations:

• Moment of inertia: ( I = \int y^2 dA )
• Section modulus: ( Z = \frac{I}{c} ), where (c) is distance from neutral axis to outer fiber

IS 5384 - Specifications for Materials in Aluminium Beams

Aluminium Beam Data (Clause 6.1 & Table 1)

Aluminium Density

• The density considered is 2.7 g/cm³ (Clause 2.7).

Alloy Compliance

• All aluminium alloys and tempers used must conform to IS 733-1983 (Clause 5.1.1).

Sample Data (ALB 60x30-1.5):

• Mass: 1.5 kg/m
• Area: 5.73 cm²
• Depth: 60 mm
• Flange width: 30 mm
• Web thickness: 4 mm
• Flange thickness: 6 mm
• Root radius: 5 mm
• Ix: 31.2 cm⁴, Iy: 2.7 cm⁴
• Section modulus Zx: 10.4 cm³
• Torsion constant κ: 0.824 cm⁴

This data supports the selection of aluminium beam sections based on criteria such as bending, torsion, and structural stability. For comprehensive design guidance, consult IS 5384 and IS 733 alloy specifications.

IS 5384 - Aluminium I-Beams: Dimensions and Sectional Properties

Core Specifications (Clause 6.1)

• Dimensions and mass per meter of aluminium I-beams are standardized according to Table 1.
• Sectional properties include:
  • Moments of inertia (Ix, Iy)
  • Section moduli (Zx, Zy)
  • Radii of gyration (rx, ry)
  • Torsion constant (K)
• Dimensions specified:
  • Depth (h) in millimeters
  • Flange width (b) in millimeters
  • Web thickness (tw) and flange thickness (tf) in millimeters
  • Root radius (r) in millimeters

Example Extract (Units in mm, cm², cm³, cm⁴)

Dimensional Tolerances

• Tolerances on dimensions are regulated strictly as per IS 3965-1981 to ensure uniformity.

Important Design Equations:

• Moment of Inertia (Ix, Iy): Provided in Table 1 for each section.
• Section Modulus: [ Z_x = \frac{I_x}{y_{max}}, \quad Z_y = \frac{I_y}{x_{max}} ]
• Radius of Gyration: [ r_x = \sqrt{\frac{I_x}{A}}, \quad r_y = \sqrt{\frac{I_y}{A}} ]

IS 5384: Guidelines on Packaging and Marking

• Density Reference: Aluminium alloy beams are based on a density of 2.7 g/cm³ (Clause 2.7).

• Marking Requirements (Clause 8.2):

  • Aluminium I-beams can be marked with the ISI Certification Mark.
  • The ISI mark confirms compliance with Indian Standards through rigorous inspection and quality assurance.
  • The use of ISI Mark is governed by the Indian Standards Institution (Certification Marks) Act.
  • Continuous monitoring by ISI ensures ongoing conformity.

• Packaging and Marking Details:

  • Specific packaging formulas or tables are not provided in the clauses.
  • Markings usually include:
    • Manufacturer’s identification
    • ISI certification mark (optional but advised)
    • Section dimensions and alloy grade

Summary Table of Marking Elements

Additional Recommendations:

• Packaging should safeguard beams against damage and corrosion during shipping.
• Markings must be clear, permanent, and easily visible.

flowchart LR
    A[Production] --> B[Quality Inspection]
    B --> C[Marking Process]
    C --> D[Packaging]
    D --> E[Dispatch]
    C --> F[ISI Marking (Optional)]

IS 5384: Marking Instructions for Aluminium I-Beams

Essential Markings (Clauses 8.1 & 8.2)

• Aluminium I-beams should be clearly labeled with:
  • Beam designation
  • Aluminium alloy and temper
  • Manufacturer’s name
  • Batch number and manufacturing year
• The ISI Certification Mark may optionally be displayed, signifying adherence to IS standards under ISI supervision.

ISI Certification Mark

• Regulated by the Indian Standards Institution (Certification Marks) Act.
• Provides assurance of product quality through testing, inspection, and continuous surveillance.

Extract from Table 1 (Clause 6.1) — Dimensions & Properties

For full details, consult IS 5384 Table 1.

Rounding Off Values

IS 5384 - Guidelines on Rounding Numerical Values

• Rounding Principle: Numerical results, whether measured or computed, must be rounded in accordance with IS 2:1960 which outlines the rules for rounding numbers.

• Precision: The rounded figure should maintain the same number of significant digits as the value specified in the standard.

Summary of IS 2:1960 Rounding Rules

Illustrative Example:

• Given value: 12.3 (3 significant digits)
• Calculated value: 12.3456 → Rounded to 12.3

Additional Information:

• This process ensures uniformity and precision in reporting results.
• These rounding rules apply to all Indian Standards referencing IS 2:1960.

flowchart LR
    A[Computed Value] --> B{Is next digit < 5?}
    B -->|Yes| C[Round Down]
    B -->|No| D[Round Up]
    C --> E[Final Rounded Number]
    D --> E

Reference: IS 5384 (1986), IS 2:1960