ABSTRACT
The M4 Elevated Section in West London is a 1.9 km concrete viaduct structure providing a major arterial route in to London. An intervention model bringing together structural assessment and forecast deterioration, corrosion modeling and cracking has been developed to prioritise structural rehabilitation. To evaluate residual strength an initial assessment of crossheads was undertaken, which identified a deficiency in tensile capacity at the ends of the crosshead cantilevers. Further assessment has been undertaken including three dimensional strut and tie, non-linear finite element analysis and plastic analysis to justify continued trafficking of the structure, confirm public safety and to determine the need for strengthening.
