Aluminium I-beam

IS 5384: Scope & Key Specifications for Aluminium Beams

Scope (Clause 2.0 & 6.1):
This standard specifies dimensions, sectional properties, and mass for Indian Standard Aluminium Beams (ALB). The properties are based on aluminium density of 2.7 g/cm³.

Key Parameters Defined (Clause 3.1):

Sample Table Extract (ALB 60x30-1.5):

IS 5384 - Definitions & Key Parameters for Aluminium Beams

Letter Symbols (Clause 3.1)

Important Notes:

• Mass per metre (M) is based on aluminium density = 2.7 g/cm³ (Clause 2.7).
• Dimensions like depth (h), flange width (b), web thickness (tw), flange thickness (ff), and root radius (r) are in mm.
• Moments of inertia, section moduli, torsion constants are in cm⁴ or cm³.

Typical Section Properties Table (Excerpt from Table 1)

IS 5384 - Letter Symbols & Key Specifications for Aluminium Beams

Clause 3.1 - Letter Symbols:

Key Formulae:

• 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) are distances from neutral axis to extreme fiber.

Table 1 Highlights (Sample):

IS 5384: Aluminium Beams Designation & Key Properties

Table 1: Aluminium Beam Designation Summary (Clause 6.1)

Important Notes:

• Designations like ALB 40x20-0.4 indicate beam depth × flange width - mass per meter.
• All dimensions and properties are standardized for design and selection.
• Aluminium alloys must conform to IS 733-1983 (Clause 5.1.1).

Example (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
• Ix = 31.2 cm⁴, Iy = 2.7 cm⁴
• Section modulus Zx = 10.4 cm³

Summary Formulae:

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

IS 5384 - Materials: Aluminium Beams Key Data

Aluminium Beam Specifications (Clause 6.1 & Table 1)

Material Density

• Aluminium density = 2.7 g/cm³ (Clause 2.7)

Aluminium Alloy Standard

• Aluminium alloys and tempers shall conform to IS 733-1983 (Clause 5.1.1)

Example (ALB 60x30-1.5):

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

This table helps select appropriate aluminium beam sections based on structural requirements like bending, torsion, and stability. For detailed design, refer to IS 5384 and IS 733 for alloy properties.

IS 5384 - Aluminium Beams: Dimensions & Sectional Properties

Key Specifications (Clause 6.1)

• Aluminium I-beams dimensions and mass per meter are standardized as per Table 1.
• Sectional properties like moment of inertia (Ix, Iy), section modulus (Zx, Zy), radius of gyration (rx, ry), and torsion constant (k) are provided for each designation.
• Dimensions include:
  • Depth (h) in mm
  • Width of flange (b) in mm
  • Thickness of web (tw) and flange (tf) in mm
  • Radius at root (r) in mm

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

Dimensional Tolerances

• As per IS 3965-1981, tolerances on dimensions are strictly controlled for consistency.

Important Formulas (for design use):

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

IS 5384: Packaging and Marking - Key Points

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

• Marking (Clause 8.2):

  • I-beam sections may be marked with the ISI Certification Mark.
  • The ISI Mark ensures compliance with Indian Standards under strict inspection and quality control.
  • Use of ISI Mark is regulated under the Indian Standards Institution (Certification Marks) Act.
  • Continuous conformity checks by ISI safeguard product quality.

• Packaging & Marking Specifications:

  • No detailed packaging formula or table is specified in the provided clauses.
  • Marking typically includes:
    • Manufacturer's identification
    • ISI Mark (optional but recommended)
    • Size and grade of the section

Summary Table: Marking Requirements

Additional Notes:

• Packaging should protect sections from damage and corrosion during transport.
• Marking must be legible and durable.

flowchart LR
    A[Manufacturing] --> B[Quality Control]
    B --> C[Marking]
    C --> D[Packaging]
    D --> E[Dispatch]
    C --> F[ISI Certification Mark (optional)]

For detailed packaging methods, refer to related IS codes or manufacturer's standards.

IS 5384: Marking Requirements for Aluminium I-Beams

Key Marking Specifications (Clause 8.1 & 8.2)

• Aluminium I-beam sections must be clearly marked with:
  • Designation
  • Alloy and temper
  • Manufacturer's name
  • Lot number/year of manufacture
• I-beams may also carry the ISI Certification Mark (Clause 8.2), indicating compliance with IS standards under ISI supervision.

ISI Certification Mark

• Governed by the Indian Standards Institution (Certification Marks) Act.
• Ensures product quality via inspection, testing, and continuous conformity checks.

Relevant Table Extract: Aluminium I-Beam Dimensions & Properties (Table 1 - Clause 6.1)

Refer IS 5384 Table 1 for full details.

Rounding Off

IS 5384 - Rounding Off Numerical Values: Key Points

• Rounding Rule:
  Final values (observed or calculated) must be rounded as per IS 2:1960 (Rules for rounding off numerical values).

• Significant Figures:
  The number of significant digits in the rounded value should match the number of significant digits in the specified value of the standard.

Summary of IS 2:1960 Rounding Rules

Example:

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

Additional Notes:

• This ensures consistency and accuracy in reporting test or analysis results.
• Applies universally across IS standards referencing IS 2:1960.

flowchart LR
    A[Calculated Value] --> B{Check digit after last significant digit}
    B -->|<5| C[Round Down]
    B -->|>=5| D[Round Up]
    C --> E[Final Rounded Value]
    D --> E

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