Le Marais, Modification to the structure to high-rise buildings

Le Marais, Modification to the structure to high-rise buildings

As part of the fire review strategy for high-rise buildings, Hartigan was engaged to analyse the suitability of modifications needed to incorporate a firefighting lift within a concrete shear core.

The Outcome

Hartigan was tasked with evaluating the structural implications of modifying the building to accommodate a minimum-sized lift in compliance with BS EN 81-72. The high-level design review demonstrated that the superstructure possesses sufficient capacity to effectively manage the redistribution of loads and forces associated with these modifications.

How we did it

Using a 3D model in Tekla Structural Designer and relying on existing structural drawings that lacked reinforcement detail, we’ve modelled, analysed, and designed the building based on the minimum reinforcement requirements established by the Eurocode for safety. The analysis encompassed both the existing and modified structures, evaluating the impact of removing half of the lift shaft's front wall (a shear wall) and extending the slab beyond its current supports to comply with BS EN 81-72.

The Challenge

The high-level design review confirmed that the building's superstructure can accommodate the redistribution of loads and forces. However, the new load paths and changes in loading required structural strengthening. This includes repairs to the concrete, reinforcing the remaining lift wall with plate bonding, and applying plate bonding to slabs across all floors.