An 11 m cantilever resolved from the inside: an internal self-balancing system offsets the overturning moment.
The Casa Grande del Pueblo is the country's main government building. It has 29 floors and a helipad, 29,492 m² built and an average floor-to-floor height of 4.5 m. Several floors, including the auditorium, carry a service load of 1,000 kg/m², and given its institutional character the building was given a very high seismic capacity.
The auditorium, with an approximate capacity of 1,100 people, includes an 11-meter cantilever toward Calle Potosí. That cantilever produces a significant overturning moment that, under normal conditions, would tilt the building.
It was necessary to design an internal self-balancing system that offsets that overturning moment. In this way, the real structural solution lies not in the cantilever itself, but inside the building. Both the cantilever and the balancing system were resolved in post-tensioned concrete.
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