Assessment of fire damage structure

Assessment of fire damaged structures

 

Assessment of fire damaged structures is essential because whilst the superficial damage is often plain to see, it is sometimes the structural damage that can’t easily be seen that is most critical to the affected elements and the structures that they support. Consequences of fire damage can include:

  • Dramatically reduced strength of the steel reinforcement, pre-stressing or post-tensioning
  • Reduced or total loss of strength in the cover concrete
  • Delamination of the cover concrete, reducing its ability to protect the embedded steel and posing a risk of injury to members of the public

We can provide Staff with a wealth of experience in the assessment of fire damaged structures. The in-situ and laboratory testing services we offer based on principles detailed in the Concrete Society document TR68 include:

  • Full defect and delamination surveys
  • Ferroscan™ and cover depth surveys
  • Rebound (Schmidt) hammer testing to determine estimated equivalent cube strengths and assess the differences between fire-damaged and unaffected areas
  • Structural coring to allow the identification of temperature-induced colour change as well as compressive strength testing
  • Petrographic analysis to determine the effects and extent of fire damage on a microscopic level
  • Reinforcement sampling for yield strength and metallurgical testing

A combination of some or all of the above techniques can be used to determine the implications of the heat generated by the fire on the materials affected. This allows you to make informed decisions with regards to repair strategy and structural sufficiency.