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Structural Calculations – Structural Steel and Foundation Design for a Renovation Project, Morbihan

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Summary: SARL Dobson Structures designed a robust structural solution for a residential renovation in France. Key features included steel beams to support new openings, reinforced masonry supports, and integrated concrete foundations to ensure safety, durability, and seismic resilience.




SARL Dobson Structures completed a structural design project at a residential property in Concoret, France. The project involved detailed calculations to ensure the safety and durability of proposed modifications, including a new steel beam installation and masonry support enhancements.

Steel Beam Design for a Renovation

The primary focus of the project was the design and calculation of steel beams to support modifications in the building’s layout. Two steel beams, sized at 203x133x25 UKB, were specified to span 4.1m, ensuring sufficient load-bearing capacity. The beams were designed to limit deflection to no more than 10mm, meeting safety and performance standards.

Ensuring Stability with Masonry Supports

To provide adequate support for the steel beams, cast concrete padstones (350x150x150mm) were incorporated at the beam bearings. These padstones distribute loads effectively onto the masonry walls, which were confirmed to be composed of natural stone. A 500mm wall nib was preserved for lateral stability, particularly to address potential seismic actions due to the location in Seismic Zone 2.

Integrated Foundations for Longevity

The foundation beneath the wall nib was reinforced with a mass-fill concrete pad to ensure long-term stability. To tie the foundations and maintain structural cohesion, a 300x300mm concrete tie beam with steel reinforcement was specified.

This comprehensive design ensured that the building’s structural integrity was preserved while enabling the proposed modifications to proceed safely.

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