Arianpour

Head of Railway Structures within Engineering and Asset Strategy, TfL

Tim Arianpour is Head of Railway Structures within Engineering and Asset Strategy at Transport for London, responsible for a diverse portfolio of bridges, station buildings and civil engineering assets supporting London's Underground network. With over 30 years' experience across the UK and internationally, he has worked across both design and asset management, including complex bridge construction, strengthening and maintenance. He leads the railway structures engineering discipline, managing ageing, safety-critical infrastructure under high operational demand. A Fellow of the Institution of Civil Engineers, the Association for Project Management and the Chartered Management Institute, and a member of the Institute of Asset Management, Tim advocates a risk-based, system-level approach to asset management, helping asset owners make better decisions about resilience, investment and whole-life performance."

My Sessions at Day 1

Wednesday 10 March 2027

15:50

Beyond Strength: System Level Asset Criticality for Resilient Bridge Networks

15:50 - 16:10

Network resilience depends less on the structural strength of individual bridges and more on the consequences of losing them. A modest bridge may sever a strategic route, while closing a major structure may have little impact where alternative routes exist. This presentation outlines a system-level asset criticality framework to support renewal, repair and reconstruction planning across bridge portfolios.

  • Consequence-based criticality: criticality is defined by the impact of failure (safety, service continuity, journey reliability, cost, societal, heritage and environmental effects) rather than asset condition. It is then combined with probability of failure in a prioritisation matrix.
  • Smarter, risk-informed maintenance: inspection intensity, intervention objectives and resourcing are tailored to system needs. This avoids over-maintaining low-impact assets and focuses effort where failure would be unacceptable.

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