scope:

The scope of this process relates to the structural assessment of structures (and their elements) for which Network Rail has responsibility, either as the owner or as a result of specific agreement. It specifically applies to the following asset types and blocks:

a) Underline bridges (except for spans less than 2m where the primary method of support is by arching action)

b) Overline bridges (except for spans less than 2m where the primary method of support is by arching action)

c) Footbridges (except for spans less than 2m where the primary method of support is by arching action)

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 (except for spans less than 2m where the primary method of support is by arching action)

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

Further guidance on the requirements for structural assessment of different asset types and blocks is provided in Appendix A.

This document is mandated for use by everyone managing the load capacity of existing structures.

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 for managing the load capacity of structures through structural assessment.Structural assessment is a form of structural analysis that uses the existing geometry, dimensions, material properties and contemporary condition of a structure to understand its load capacity.

It forms part of the control barrier 'Carry out Structural Assessment and implement actions' to prevent functional failure of the structure.