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Expertise of damage in a reinforced concrete structure

Swimming pool of the "Black Pearl" chalet - Courchevel 1850, France

Non linear calculations in order to specify the origin of the damage, linear calculations to establish reinforcement mappings and estimate the lack of reinforcement, retrofitting solution and final check calculation

The "Black Pearl" chalet was built in 2009 in Courchevel 1850, French Alps. It has several levels, of which one with a swimming pool. The pool is made of a reinforced concrete structure. Some damage appeared in the pool structure, among which cracks of variable widths on the bottom slab and on the lateral walls.

NECS' mission was as follows :
- Study the real behaviour of the structure thanks to a 3D numerical modelling and a non linear analysis taking into account concrete cracking and reinforcement steel yielding, in order to compute the real stress and strain in the structure and compare with in situ observations. This step of the study aims at determining the causes of concrete damage.
- Carry out standard linear calculations for serviceability and ultimate limite state combinations in order to estimate the structural deficiencies in concrete dimensions and reinforcement quantities.
- Suggest a retrofitting solution and carry out a final check calculation.

Black Pearl chalet section
Black Pearl chalet section
Photo of the swilling pool
Photo of the swilling pool
[[IDnnnn_P03.jpg|Numerical modelling of the studied structure]]
Swimming pool strain
Swimming pool strain
Strain mapping and comparison to in situ observation
Strain mapping and comparison to in situ observation
Stress mapping in bottom slab
Stress mapping in bottom slab