Ciria C577 ★ Must Watch

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.

❌ “Robustness means designing for a bomb blast.” ✅ No—it means preventing disproportionate collapse, which is usually achieved with simple tying. ciria c577

❌ “My software does all this automatically.” ✅ No software can interpret tie forces and notional removal logic—engineering judgement is required. With the rise of BIM and parametric design,

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. ❌ “Robustness means designing for a bomb blast

❌ “Only high-rise buildings need robustness checks.” ✅ Buildings as low as 4 storeys in consequence class CC2a still require robust detailing.

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.