Can seismic acceleration generate hydrostatic pressure in a liquid column?
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The medium in a container generates hydrostatic pressure due to gravitational acceleration; can seismic acceleration generate hydrostatic pressure as well? If it can be generated, what is the relationship between the static pressure of this liquid column and the seismic force generated by the medium?
This issue falls within the category of liquid sloshing dynamics. Liquid rockets and single-stage-to-orbit liquid-fueled spacecraft are all examples of such problems. In the petrochemical industry, only storage tanks take into account the movement of liquids during earthquakes, as well as the impact of wave height on seismic design. However, the diameter of towers is generally not as large as that of storage tanks, and the liquid level in the tower bottom is low; this issue has not been taken into account.
Thank you. From my personal understanding, since it’s acceleration, shouldn’t it be possible to generate it in both cases? If seismic acceleration generates hydrostatic pressure in a liquid column, and seismic forces are also generated by earthquakes, is considering both aspects redundant?
Mainly, the liquid oscillates under the influence of seismic waves, exerting force on the tank walls. But according to the standards, it’s difficult to calculate.
I think the impulse from this kind of shaking is negligible compared to the liquid hammer caused by gas propulsion.
During an earthquake, the liquid medium inside the equipment is no longer subject to the hydrostatic pressure of a liquid column acting on the container. During an earthquake, the liquid inside the container exerts a force on the container walls.
If the pressure generated by seismic acceleration is taken into account for the medium, then the weight of the medium cannot be considered as part of the seismic forces; otherwise it would be redundant
Two concepts. On the equipment, considering the hydrostatic pressure of the liquid column is necessary to calculate the strength of the container and meet the basic requirements for normal operation. And liquid movement is used to analyze whether the equipment can withstand corresponding seismic damage. As mentioned in point 3#, with ordinary equipment, either the liquid level is low or the container is relatively narrow; this issue is ignored due to the minimal impact on the container walls. However, in certain specialized fields such as aerospace and nuclear power, where strict requirements are placed on precision and strength, liquid movement must be taken into account and kept at a certain level or below.