The earthquake through the foundation imposes a horizontal acceleration in the construction where, from its size, the destruction index depends.
Constructions had to fly or have the appropriate dynamic response to cope.
Unfortunately, the constructions do not fly and do not have the appropriate dynamic response to cope with large earthquakes.
There is no construction on the planet that can withstand an earthquake that will coordinate with the construction and will have great acceleration and duration.
Simply and fortunately, these three asymmetric factors rarely coincide.
But what will happen if these three asymmetric factors coincide and destroy projects of great importance such as hospitals, nuclear power plants?
Of course, some techniques of horizontal seismic insulation and viscosity damping help, but they are very expensive and imperfect in tall buildings.
The good design of the nodes and the plasticity save some lives but completely destroy the buildings.
And the buildings in the next earthquake are remembered
Since the construction does not fly and is forced to rest on the ground the only solution is to increase the dynamic response.
But in order for something to be dynamic, it must be rigid and the rigid is overturned.
Something that is overturned is simply screwed
on Where?
On the ground.
Believe me, there is nothing more powerful than which we can draw strength and transfer it to the structure to increase its response to the earthquake from planet earth!
Dear Aparna Sathya Murthy
In an earthquake, the columns lose their eccentricity and their bases are lifted, creating twisting in all of the nodes of the structure. There is a limit to the eccentricity, that is, there is a limit to the surface area of the base which is lifted by the rollover moment. To minimize the twisting of the bases, we place strong foot girders in the columns. In the large longitudinal columns (walls), due to the large moments which occur during an earthquake, it is practically impossible to prevent rotation with the classical way of construction of the foot girders.
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