CIRIA C577: The Essential Guide to Structural Robustness for Builders and Engineers
From this tragedy came modern robustness requirements. And in the UK, one document stands above the rest for practical guidance: .
Published in 2005 (with updates and related guidance since), CIRIA C577 – Robustness of structures provides a comprehensive methodology for designing and assessing structural robustness. It bridges the gap between the high-level principles of Eurocodes (BS EN 1991-1-7) and real-world construction practice. ciria c577
In 1968, the partial collapse of Ronan Point tower block in London changed structural engineering forever. A minor gas explosion led to a disproportionate collapse—a small failure triggered a chain reaction far larger than its original cause.
With the rise of BIM and parametric design, CIRIA’s methodology is increasingly being automated. Some engineering firms now script notional removal checks into their analysis software. However, the —why a building is robust—still comes from the principles in C577. CIRIA C577: The Essential Guide to Structural Robustness
Ronan Point was a wake-up call. CIRIA C577 is the answer. Whether you’re designing a car park, a hospital, or a mixed-use tower, this guide gives you the practical steps to prevent the unthinkable.
❌ “My software does all this automatically.” ✅ No software can interpret tie forces and notional removal logic—engineering judgement is required. It bridges the gap between the high-level principles
❌ “Robustness means designing for a bomb blast.” ✅ No—it means preventing disproportionate collapse, which is usually achieved with simple tying.