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Old Posted Apr 16, 2021, 8:55 PM
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Join Date: Feb 2010
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The behavior of the structure during an earthquake is basically a horizontal displacement (let's forget for a moment any vertical component) that is repeated a few times. If the displacement is small enough to hold all the members of the structure within the elastic region, the energy generated is energy stored in the structure (in the body of the elements) and then released to restore the structure to its original shape. Like the spring. This energy storage and then its performance in the opposite direction applied by the spring, in the construction is stored and released by the pillar and the beam. In short, all the acceleration of the earthquake is converted into stored energy in the structure. As long as the displacement holds each part of any member within an elastic region, all the energy stored in the structure will circulate at the end of the cycle, in the opposite direction. This displacement region is called the elastic region, in which no failures are observed. If the seismic energy (measured by ground acceleration) is too large, it will produce excessively large displacements that will cause a very high curvature in the vertical and horizontal elements. If the curvature is too high, this means that the rotation of the sections of columns and beams will be well above the elastic area (Compressive concrete deformation over 0.35% and reinforcement fiber stresses over 0.2 %) beyond the leakage limit. When the rotation exceeds this limit of elasticity, the structure begins to "dissolve the energy storage" through plastic displacement, which means that the parts will have a residual displacement that will not be able to be recovered (while in the elastic region all displacements are recovered). Basically the design of the strength of a current building is limited to the limits of the elastic design range, and then goes to the default plastic leak areas, which are default areas of small and many leak failures, (usually designed to occur at the ends of the beams) so that it does not collapse the structure. This is the mechanism of plasticity that consumes seismic energy. (Structure collapses when oblique / failed columns fail) If the parts that experience the plastic deformations exceed the breaking point limit, and there are too many on the structure, the structure will collapse.
It is known that the columns and the walls are joined at the nodes with the beams. Any change in the position of the vertical axis of the trunk of the wall and the pillar is transferred to the trunk of the beam.
This is what I mean when I say that your design recycles tensions. That is, the intensities of bending and tipping moment of the vertical elements, are transferred and recycled around the nodes. My design does not send tensions to the cross sections around the nodes. My design sends the right compression and tensile forces of the wall into the ground. This is the main difference.
It is a method that uses a mechanism to pontoon nodes of higher level of constructions with earth and which dynamically deflect the lateral load of the earthquake through the vertical support elements and directs them into the ground controlling in this way the oscillation of the construction.
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