VIBRATION DISSIPATED METHOD OF SPHERICALLIQUID- STORAGE TANK

摘要

Thedamageofsphericalliquidstorage tank and its by-product can result in serious deaths and economic loss. Furthermore, the spherical liquid-storage tanks constructing in China are becoming larger. Therefore, the research of seismic response and the technology to reduce the earthquake damage of spherical tanks have turn into important topic in the research of seismic resistance of petrochemical facility. The seismic resistant research of spherical tank had been analyzed widely. However, most of the standard and code of seismic resistance simplify the spherical tank as and single mass point and ignore the inside liquid sloshing and its effect to the tank. The couple movement of fluid and solid is and complex mathematic and mechanical problem and is very hard to be solved in the pass because of the restriction of hardware, say nothing of engineering application. In this paper, ANSYS, the professional finite element analysis software is used to build a 1000m~3 spherical tank with liquefied petroleum gas (density is 480kg/m~3) filled inside. The tank-shell is made by steel plate (16MnR), whose density and elastic ratio is 7.85 X 10~3kg/m~3 and 2.06 x 10~(11)N/ m~2 respectively. Its non-linearity is taken into account, as it is been regarded as strengthen bilinear material. The inner pressure inside the tank is 1.6Mpa. Its diameter, thickness of the shell and the distance between the center and the ground is 12.3m, 0.034m, and 8m respectively. Contact elements are insert between the shell and liquid to realize their relative movement. The spherical tank is supported by ten steel tube columns (Φ426 x 10) and vertical tension braces (S = 0.056 m~2) are installed between them. The earthquake excitation used in this topic is Tianjin wave (X-Direction and peak value is 0.4m/s~2.