What does ISALB 150 signify?

It denotes an Indian Standard Aluminium Light Beam with a nominal depth of 150 mm.

What material is used for these I-beams?

The material must conform to a suitable wrought aluminium alloy grade specified in IS 733, such as 63400 WP (6061-T6) or 64430 WP (6082-T6).

What is the mass of an ISALB 100 beam?

The nominal mass is 5.021 kg per metre, as per Table 1.

Can I use design properties from steel beam tables for these sections?

No. This standard defines a unique series of sections for aluminium, and the material properties (density, modulus of elasticity, strength) are vastly different from steel.

IS 5384

: 1985

Aluminium I-beam

CurrentSpecializedSpecificationBIMMaterials Science · Structural Engineering and Structural Sections

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This Indian Standard specifies the dimensions, mass, sectional properties, and manufacturing tolerances for a series of hot-rolled or extruded aluminium and aluminium alloy I-beams. It provides a standardized table of beam sections, designated ISALB (Indian Standard Aluminium Light Beam), intended for use in structural and general engineering applications.

Aluminium I-beam

Quick Reference Values

Mass of ISALB 1005.021 kg/m

Depth of ISALB 150150 mm

Flange width of ISALB 200100 mm

Web thickness of ISALB 1255.0 mm

Tolerance on depth (for D > 150 mm)+2.5 mm, -1.5 mm

Tolerance on flange width (for B <= 100 mm)± 2.0 mm

Practical Notes

The designation 'ISALB' stands for 'Indian Standard Aluminium Light Beam', followed by the nominal depth in mm.

Aluminium's modulus of elasticity is approximately one-third that of steel, leading to significantly higher deflections under the same load and span, a critical design consideration.

The actual mechanical properties (yield strength, ultimate strength) are determined by the specific alloy grade (e.g., 6061-T6, 6082-T6) as specified in IS 733, not by this dimensional standard.