Earthquakes and anti-seismic prefabricated buildings

Earthquakes are natural phenomena that have accompanied man throughout his history.

As long as the man-made shelters were huts, earthquakes caused more fear than harm.

Later, the growing technological capacity led man to build houses with stone walls and later with bricks.

These solid and robust buildings have given man shelter comfort and security, but they can suffer serious damage from earthquakes.

The advent of reinforced concrete has improved the resistance to the shaking of buildings, caused by the earthquake, and has made it possible to build higher buildings.

Nevertheless, precisely because of the greater height, reinforced concrete buildings may undergo inelastic deformations (figure above right) and even collapse due to strong seismic shocks and, when this happens, the number of victims is often high.

Recently the construction of buildings with a steel structure has further increased the resistance to seismic shocks, making it possible to build even taller buildings.

Elastic buildings, with steel pillars and beams, are able to oscillate and therefore better withstand seismic waves.

Nevertheless, earthquakes of very high magnitude can cause severe deformations, partial collapse and even total collapse, even in current buildings with steel structures.

On uneven ground, the violent seismic oscillations of an elastic building can accentuate the phenomenon of liquefaction of the soil with consequent inclination and, in extreme cases, collapse of the building (figure on the left and figure on the lower right).

Recent systems of constraints of buildings on the ground, made of elastic materials, mitigate the effects of earthquake shocks on buildings.

We have filed a patent for a pre-fabricated aseismic building in steel, which is not subject to earthquake shocks.

On soils that are not sufficiently consistent, the patented aseismic building significantly reduces the possibility that it may be damaged by liquefaction of the soil.

The modular pre-fabricated aseismic building is composed of modules produced in the factory, transported on normal articulated lorries and assembled on site.

We have filed a patent for a seismic wave exciter which can be applied on site to any type of structure, for example pillars, load-bearing walls, building floors, to test its resistance to seismic shocks or, after an earthquake, to assess its integrity. 

The exciter can also be connected to platforms for seismic tests.