What is the standard thickness of a Thrie-beam section?

The nominal thickness of the steel sheet used for the beam element is 3.00 mm (Clause 4.2).

What is the minimum galvanizing coating required?

A minimum zinc coating mass of 550 g/m² is required, conforming to the heavy grade specified in IS 277 (Clause 7.1).

What grade of steel is specified for the Thrie-beam?

The steel must conform to Grade Fe 410-W of IS 1079 or Grade A of IS 2062 (Clause 3.1).

Is this standard still active?

No, it has been withdrawn and replaced by IS 12700 (Part 1):2017 and IS 12700 (Part 2):2017.

IS 12700

: 1989

Metal Beam Crash Barriers for Highways - Thrie-Beam - Specification

CurrentSpecializedSpecificationBIMTransportation · Fencing, Gates and Barriers

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This standard specifies the requirements for Thrie-beam type metal crash barriers used on highways. It covers the materials, dimensions, fabrication, galvanization process, and acceptance testing criteria to ensure the barriers' quality and performance in redirecting vehicles upon impact.

Specifies requirements for Thrie-beam type metal crash barriers used on highways.

Quick Reference Values

Minimum zinc coating mass550 g/m²

Nominal beam element thickness3.00 mm

Overall depth of beam506 mm

Nominal length of beam4318 mm

Minimum tensile strength of steel410 MPa

Minimum yield strength of steel235 MPa

Practical Notes

This standard has been officially withdrawn and superseded by IS 12700 (Part 1):2017 and IS 12700 (Part 2):2017. The new standards should be used for all current and future projects.

The quality of galvanization is critical for the service life of the barrier. On-site checks for coating thickness and uniformity are highly recommended.

Thrie-beam barriers provide a larger contact face and higher stiffness than W-beams, making them suitable for locations with a higher risk of heavy vehicle impact, such as on bridges or high embankments.