scope:

The scope of this document relates to the structural assessment of structures (and their elements) for which Network Rail has responsibility, either as owner of the Structure, or as a result of specific agreement.

It includes requirements and guidance for:

a) Underline bridges;

b) Overline bridges;

c) Footbridges;

d) Culverts (except where the primary method of support is by arching action);

e) Undercrofts;

f) Canopies;

g) Train and depot sheds;

h) Tunnels that directly support external traffic loads;

i) Side bridges;

j) Other Structures where examination of condition alone is insufficient to inform management decisions.

It should be used by everyone undertaking structural assessment.

Do not use structural assessment techniques for design unless directed by structures controls for 'design, construct and commission' or specifically instructed by a representative of Network Rail.

Purpose

This document sets out the procedures and defines the methods and requirements for carrying out Structural Assessments.

It complements:

• NR/L2/CIV/035/MOD01 'Management of Structural Assessment';

• NR/L3/CIV/023 'Assessment of Footbridges';

• NR/L3/CIV/024 'Assessment of Operational Properties';

• NR/GN/CIV/025 'The Structural Assessment of Underbridges'.

It forms part of the control barrier 'Carry out Structural Assessment and Implement Actions' against functional failure of the structure.