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Old Posted May 25, 2021, 7:51 PM
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Join Date: Feb 2010
Location: ISLAND OF IOS CYCLADES
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Why do we need plasticity if we can control deformation?

The columns are elastic with low dynamics. The walls, the wells, are rigid with great dynamics. The columns when rocking in the elastic displacement area consume seismic energy because through friction they convert the seismic kinetic energy into thermal energy. When the earthquake is large and they undergo inelastic displacement, they create cracks in the beams, releasing the seismic energy (plasticity) But the truth is that they offer almost no dynamic reaction because they recede due to elasticity and allow the rigid walls to absorb all the force of the earthquake. For this reason the columns in static calculations are used to receive only static loads while the walls to receive both static and dynamic seismic loads. For this reason the walls fail first in the earthquake. That which is elastic bends (columns) and that which is rigid (walls) is overturned. If we create anchoring of the wall with the foundation ground + apply compressive forces to its cross section then neither it will bend nor it will be overturned. The shear force of base will pick up the wall without any problem. This was shown by the simulation and the experiments I did .. The shear failure as well as the critical failure area will disappear along with the bend. Deformation along with failures will be eliminated. Why do we need plasticity if we can control deformation? Pre-tension walls are considered elastic in high-rise structures. The walls simply show smaller cracks due to prestressing.

Simulation and numerical investigation of seismic system behavior
https://www.researchgate.net/publica...ystem_behavior
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