STUDY THE OSCILATIONS OF DISCRETE-CONTINUOUS SYSTEM BY IMPULSE IMPACT
DOI:
https://doi.org/10.52340/building.2024.01.69.01Keywords:
buildings, impulse action, seismic regions, seismic codes, discrete-continuous systemAbstract
Today, the main methods for assessing seismic resistance and calculating seismic loads involve calculating a static load, mainly horizontal, which is considered equivalent to the seismic load. Initially, these design static loads were defined as inertial forces equal to the mass of the building multiplied by the seismic acceleration of the ground. This approach is called the static calculation method.
Under impulse action, the displacements of the elastic-plastic system are smaller compared to displacements during elastic vibrations. In the case of an elastoplastic system, oscillation after the end of the pulse is presented, which occurs due to residual plastic displacement. Under impulse action, the same acceleration can be caused by different types of velocities corresponding to the values of displacement and forces. Therefore, in the area adjacent to a tectonic fault, where the impact is of a pulsed nature, it is appropriate to take not acceleration, but speed, as the zone of seismic regions.
In the case of a re-strike, depending on at what point in the swing the re-strike occurs, the result will be different. According to the physical law of material, the force cannot exceed the limit value, and it can be significantly reduced by reducing it. And if movements are not limited, they can increase significantly.
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References
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